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Custom Controls in Win32 API: Scrolling

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How to support scrolling within your controls.

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Machine Learning for C++ developers - the hard way: DirectML

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by Ștefan-Mihai MOGA

Task Manager shows you the programs, processes, and services that are currently running on your computer. You can use Task Manager to monitor your computer’s performance or to close a program that is not responding.

IntelliFile - An Alternative Windows Version to the Famous Total Commander

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This article is about the IntelliFile application which is a free alternative Windows version to Total Commander and uses many components that have been published on CodeProject.

ScreenCapture: Single Header DirectX Library with HDR ability

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DirectX hardware screen capture and encoding with audio mixing capabilities. H264/H265/VP80/VP90/FLAC/MP3. HDR supported.

All Articles

Win32

What is wrong with this my hard disc serial number getting code?

N 28 Apr 2024 by OriginalGriff

DeviceIoControl returns error code 50 when the requested operation is not supported by the device: System Error Codes (0-499) (WinError.h) - Win32 apps | Microsoft Learn[^] IIRC not all hard drives support serial numbers, so that may be your...

What is wrong with this my hard disc serial number getting code?

N 28 Apr 2024 by Gbenbam

The following program failed with GetLastError() returning code 50. What could be wrong? Please note the hard disk in question definitely has a serial number. BOOL GetDiskSerialNumber(std::wstring& wstSerialNumber, const TCHAR * wszPath) { ...

Machine Learning for C++ developers - the hard way: DirectML

18 Apr 2024 by Michael Chourdakis

An introduction to machine learning with working C++ code that trains a linear regression model.

machine-learning

How can I resolve this WM_PAINT handling program?

8 Apr 2024 by steveb

You need to draw to memory DC before you call BeginPaint. Your BeginPaint should have only 2 more lines after it - BitBlt and EndPaint. All drawing must be done prior to these lines. And perhaps use Direct2D API. This way you'll take care of...

IntelliTask

8 Apr 2024 by Ștefan-Mihai MOGA

Task Manager shows you the programs, processes, and services that are currently running on your computer. You can use Task Manager to monitor your computer’s performance or to close a program that is not responding.

Are windows HDC and printers HDC not supposed to work identically?

6 Apr 2024 by Pete O'Hanlon

The problem you're describing is resolution. Typically, printers support a much higher resolution than a screen does, so if you have made assumptions about DPI, for instance, you will see a different output. It's best to work with Device...

Are windows HDC and printers HDC not supposed to work identically?

6 Apr 2024 by Gbenbam

The display program that I used to render to a window dc was used by me to write to PriPrinter a virtual printing software. Everything worked fine except that the images were rendered to true size and not according to specified size. Is it...

How can I resolve this WM_PAINT handling program?

5 Apr 2024 by Gbenbam

For some time now I have been trying to resolve the WM_PAINT code or my application. Every advise I have ever been given on this issue, I have applied. Someone said I should carry out all the DC operations in WM_PAINT. I did that. Someone said...

How can I resolve this WM_PAINT handling program?

5 Apr 2024 by KarstenK

I see no easy fix but you may debug it via double buffering. At first you paint a complete image into some memory dc and than make a BitBlt to the screen. Read this Guide to DC to improve your knowledge. Best is to optimize the code via...

IntelliFile - An Alternative Windows Version to the Famous Total Commander

30 Mar 2024 by Ștefan-Mihai MOGA

This article is about the IntelliFile application which is a free alternative Windows version to Total Commander and uses many components that have been published on CodeProject.

Why am I unable to scroll with the thumbtrack in this my scrolling program?

28 Mar 2024 by Richard MacCutchan

Here is the essential parts of the code I use to allow scrolling in a self painted Window. If you want an easier life then you can use one of the standard Windows controls (e.g. Edit Control (Windows Controls) - Win32 apps | Microsoft Learn[^] )...

Why am I unable to scroll with the thumbtrack in this my scrolling program?

27 Mar 2024 by Gbenbam

In the program below, everything works fine until I try to scroll with the thumbtrack. The thumtrack simply snaps back to its initial position after I release it. What could be wrong? case WM_VSCROLL: { SCROLLINFO scrollInfo; ...

How do I handle double line buffering in a situation when the document size is larger than the memory doc bitmap size?

23 Mar 2024 by merano99

What is meant by scrolling in this case is unclear. I assume that an image is to be drawn that is larger than the window. If the image is not to be scaled to the size of the window, you will only see the part of the image that fits into the...

How do I handle double line buffering in a situation when the document size is larger than the memory doc bitmap size?

22 Mar 2024 by OriginalGriff

If I understand you right, you are trying to "draw a picture" (which is what all text and lines end up as when they are rendered for actual display) that is bigger than the bitmap you are drawing into. Imagine this: you have a whiteboard on your...

How do I handle double line buffering in a situation when the document size is larger than the memory doc bitmap size?

22 Mar 2024 by Gbenbam

My app's document contains redered images, ellipse, rectangles, lines etc. For as long as I don't scroll past the memory dc bitmap size, display comes out fine, but ones I scroll over a distance greater than the memory dc bitmap size,the display...

Sendmessage() doesn't send windows messge to the Python window.

21 Mar 2024 by Ege Öztaş

I am trying to understand python's capability to use Windows Messages with pywin32 library. For this I have created 2 scripts that are supposed to run parralel to each other. One is a client that is supposed to send messages the other is a server...

ScreenCapture: Single Header DirectX Library with HDR ability

20 Mar 2024 by Michael Chourdakis

DirectX hardware screen capture and encoding with audio mixing capabilities. H264/H265/VP80/VP90/FLAC/MP3. HDR supported.

BASIC is not dead! Neither is the WIN32! Time to end the myth. (Part 3)

28 Feb 2024 by Chris Boss

BASIC: A powerful language often underestimated and undervalued

IntelliPort

21 Feb 2024 by Ștefan-Mihai MOGA

You can use IntelliPort to transfer large files from a computer onto your portable computer using a serial port rather than going through the process of setting up your portable computer on a network.

Introduction to ELENA Programming Language

20 Feb 2024 by Alex Rakov, Alexandre Bencz

ELENA is a general-purpose, object-oriented, polymorphic language with late binding

Thank You for Your Service: Creating a Persistent Isolated Windows Service

14 Feb 2024 by Michael Haephrati

Windows Services are powerful little beasts and encountering them is unavoidable when developing under Windows

The Guide to WinUI3 for a C++ Win32 Programmer

1 Feb 2024 by Michael Chourdakis

Easily migrate to WinUI3 from plain Win32 while keeping all Win32 features intact

Introduction to Native DLLs - Part 2: Exporting Functions

25 Jan 2024 by Bruno van Dooren

An introduction to exporting functions from DLLs

SET Network Parameters with IPCONFIG and Text Files

24 Jan 2024 by Allegra Angelo

Save, read and text recognition of network parameters

Crypt Library Demo - The Basics of Microsoft CryptoAPI Library

20 Jan 2024 by Ștefan-Mihai MOGA

The article discusses the concept of cryptography and its application in ensuring data security.

Introduction to Native DLLs - Part 1: Boilerplate

11 Jan 2024 by Bruno van Dooren

In this article, I explain how to create win32 style DLLs and what the various significant intricacies are.

Using Asynchronous Procedure Calls (APC) in Windows based C++ applications to perform GUI Update

8 Dec 2023 by Bruno van Dooren

How to use APCs to perform user interface updates

parallelization

Clear the window current content before printing a new content in win32 api

25 Nov 2023 by Richard MacCutchan

It depends where you are storing the data that you dispaly in the Window. The proper sequence of operations is to respond to the WM_PAINT message by displaying all the relevant information in the window, as controlled by any scrollbar...

Clear the window current content before printing a new content in win32 api

21 Nov 2023 by R1S8K

Hi, I'm working on developing my win32 api test application. I've done the tool bar menus. Static and button controls. Every thing is OK, but the problem is that when I want to print a new content, I still have some stuff from the previous...

How to calculate coordinates of rotated text?

13 Nov 2023 by zhivot

I am converting between GDI (Win32 API) and different drawing format that also supports text and glyph rotation. Text output in GDI is specified with a reference point (and vertical alignment), but it is easy to take that into account when the...

How do I access data in std::unique_ptr?

6 Nov 2023 by Gbenbam

The code below is snippet of a code in my application whose goal is to get item data from a listbox. for (int j = 0; j

How do I access data in std::unique_ptr?

5 Nov 2023 by Richard MacCutchan

I just tried the same code and it works correctly. You need to use the debugger to check what is happening. It would also help if you put the code in order, and showed the actual values that it uses.

How is std::unique_ptr used?

3 Nov 2023 by Gbenbam

I have come to realise that one of the issues causing failure in my application recently is the improper use of smart pointer. I thought I had complete grasp of its usage until now! Consider the code snippet from an application that consumed...

How is std::unique_ptr used?

3 Nov 2023 by Richard MacCutchan

The problem you have is with this line: int iSelected = (int)SendMessage(GetDlgItem(hDlg, IDC_LIST2), LB_GETSELITEMS, 0, (LPARAM)pStatus.get()); The WPARAM item is required to contain the maximum size of the input buffer: see...

Why does choosefont fail in win32?

27 Oct 2023 by Kyudos

I have some C code for a Win32 DLL that I'm trying to modify, but I'm having to guess at the build settings, because it is just code. I've got it building in VS2010, and it seems to be mostly working (despite some dodgy coding!) However, calls...

Why does choosefont fail in win32?

26 Oct 2023 by CPallini

A hint from 'the documentation[^]': CDERR_DIALOGFAILURE 0xFFFF The dialog box could not be created. The common dialog box function's call to the DialogBox function failed. For example, this error occurs if the common dialog box call specifies an...

Why does choosefont fail in win32?

26 Oct 2023 by KarstenK

You must do something wrong in the call like not provided enought data with null pointers. Read the documentation and the example code from Microsoft to learn it.

Resizing issues while trying to use opengl in a child window made with win32 api

24 Oct 2023 by samas69420

I have a window made with win32 API and inside this window, there is a smaller window in which another thread draws images using opengl. I removed the default frame and painted the visible portion of the big window so I can use it as a custom...

Can I use an existing windows message loop from a DLL?

24 Sep 2023 by merano99

When a Win32 DLL is loaded into an application using the LoadLibrary function, the DLL is loaded into the application's memory and becomes part of the application's address space. This means that the DLL and the original executable (exe) are in...

Can I use an existing windows message loop from a DLL?

24 Sep 2023 by honey the codewitch

I was creating the window on a different thread without realizing it. Once I fixed that the problem went away.

Can I use an existing windows message loop from a DLL?

23 Sep 2023 by honey the codewitch

I've got a DLL that gets loaded by a parent executable. The DLL needs to create a window. I'd like the DLL window to use the primary message loop in the executable, but the windowproc in the DLL. I'm just curious if this even a thing I can do,...

Get the text of an edit control as it changes?

21 Sep 2023 by honey the codewitch

You need to use the HWND in the lParam of the WindowProc instead of the HWND retrieved from CreateWindowEx on the edit control.

Get the text of an edit control as it changes?

21 Sep 2023 by honey the codewitch

I'm hanging on to my edit control window handle and calling GetWindowText every time I get a WM_COMMAND with EN_CHANGE on the parent window From there I don't get any reasonable value back. It's just an empty string. How the heck do I get the...

Customize List View Column Headers

20 Sep 2023 by Javad Taheri (drjackool)

Show or hide, reorder, save and restore list view column headers

What is the best way to make color transition animation with stop timer

19 Sep 2023 by TheNewbieProgrammer

I know this may sound silly, but to fix this you need to replace the color value with the starting color. And the other thing you need to do is to use elapsedTime instead of deltaTime to calculate the progress. Here's the code: float progress =...

ToDoList 8.2 - An Effective and Flexible Way to Keep on Top of Your Tasks

17 Sep 2023 by .dan.g.

A hierarchical task manager with native XML support for custom reporting

Direct2d surface w/ bitmap not rendering

13 Sep 2023 by honey the codewitch

I have a little directX that is simply an overlapped window with a Direct2d surface on it. In WM_PAINT, I try to fill some memory with the color purple, and then copy that to a bitmap, before writing the bitmap to a display. Trouble is,...

Direct2d surface w/ bitmap not rendering

13 Sep 2023 by Maxim Kartavenkov

You should made proper question naming as your question is about Direct2D not the DirectDraw - different technologies. Anyway here is the simple workable example implementation of what you need. It trigger repaint event each second and update...

Listview custom drawing grid lines. Scrolling problem.

12 Sep 2023 by NoviceCoder871987

I ran into a weird issue with custom drawing the listview control. I drew the grid lines in response to CDDS_POSTPAINT notification. All working okay so far. However, when scrolling vertically, the lines will be messed up and will not be drawn at...

Listview custom drawing grid lines. Scrolling problem.

9 Sep 2023 by Richard MacCutchan

See About Custom Draw - Win32 apps | Microsoft Learn[^] for custom drawing in Report mode.

Alternative to URLDownloadToFile function

20 Aug 2023 by Ștefan-Mihai MOGA

How to download files from an HTTP server.

cngsha3: A Cryptography Next Generation Implementation of Newer Algorithms

13 Aug 2023 by Michael Chourdakis

Use SHA-3 and the CRYSTALS Kyber, Dilithium and Sphincs in Win32 projects

How to find multiple window handles from a process ID

24 Jul 2023 by Michael Haephrati

The following code locates the handles of all windows per a given PID. #include #include void GetAllWindowsFromProcessID(DWORD dwProcessID, std::vector& vhWnds) { // find all hWnds (vhWnds) associated with a...

What is the best way to make color transition animation with stop timer

17 Jul 2023 by Rick York

One thing to keep in mind is the Windows timer works on multiples of 60Hz or 16.7ms. That is as low as it will go about 60Hz is achievable as is 30Hz. At the risk of blowing my own horn, I like this class for determining elapsed time : High...

What is the best way to make color transition animation with stop timer

17 Jul 2023 by TheNewbieProgrammer

I will explain the problem very briefly: In order to get a color animation, the lerp algorithm must be used to change the colors smoothly, which requires the progress of the animation (std::min)((deltaTime / duration), 1.0f) But there is a...

What is the best way to make color transition animation with stop timer

16 Jul 2023 by KarstenK

You wil have to dig it out yourself. Start by making more TRACE output with a detailed timestamp. I would use some constant for the timer id. In this code your arent correctly use the timer id. Check it! tip: start with a low frame rate like 10...

WM_SETREDRAW fails when visual styles are enabled

9 Jul 2023 by Avtem

There is a WM_SETREDRAW message in WinAPI which you can send to a window in order to suspend/resume drawing updates. It works fine, but as soon as i add visual styles from comctl32 v.6.0.0 to my program calling WM_SETREDRAW on a ListView control...

WM_SETREDRAW fails when visual styles are enabled

9 Jul 2023 by Avtem

Unfortunately i couldn't figure out how to use WM_SETREDRAW with ListView controls, but since MDSN describes us how it's implemented i decided to do what they do - remove or add WS_VISIBLE style from the window without invalidating its rectangle....

WM_SETREDRAW fails when visual styles are enabled

9 Jul 2023 by Richard MacCutchan

See the Remarks section at WM_SETREDRAW message[^].

FingerPrintf: A Small Library for Quick Usage of the Biometric API, Fingerprint and Camera

18 Jun 2023 by Michael Chourdakis

Use your sensors for identification and verification

Hacking with Windbg - Part 2 (Minesweeper)

5 Jun 2023 by Sarthak S

Assembly inspection and hacking with windbg

Hacking with Windbg - Part 1 (Notepad)

31 May 2023 by Sarthak S

Assembly inspection and hacking with windbg

Allowing Only Numeric Input in a TextBox

7 May 2023 by ToughDev

How to allow only numeric input in TextBox

WinUI3 in Existing Win32 Applications

6 May 2023 by Michael Chourdakis

How to use the WinUI3 controls in a plain Win32 application without packaging

How to enable selecting by typing a WORD in a winapicombobox

25 Apr 2023 by Richard MacCutchan

See ComboBox.AutoCompleteMode Property (System.Windows.Forms) | Microsoft Learn[^]. My apologies, try CB_FINDSTRING message (Winuser.h) - Win32 apps | Microsoft Learn[^]

How to enable selecting by typing a WORD in a winapicombobox

25 Apr 2023 by Avtem

So, many WinAPI controls have a very useful feature - you can select an item in Listbox, ListView, Combobox by typing first several letters. You can try it out: just open your windows calculator, hit Ctrl+U to enable converting units view and in...

Win32 winsock bind/reverse shell with createprocess: diffence between client and server

16 Apr 2023 by Member 15980553

I've Tested this bindshell and it's working. in order to work you should use WSASocket & WSAAccept (CreateProcess I/O redirection requires HANDLEs that are non-Overlapped. Which is why use of socket doesn't work and WSASOCKET does) #include...

Win32 winsock bind/reverse shell with createprocess: diffence between client and server

16 Apr 2023 by Member 13265280

Hello, I would like to get bind/reverse shell with win32 winsock. By calling CreateProcess with STARTF_USESTDHANDLES, I got a reverse shell (client mode) as expected. However I failed to got a bind shell (server mode) with same approach. What is the difference between client mode (reverse...

Understanding Windows Asynchronous Procedure Calls (APCs)

2 Apr 2023 by Bruno van Dooren

In this article, I will explain Asynchronous Procedure Calls (APCs), their uses and their pitfalls

parallelization

I get always an error "exception thrown: read access violation. Isf was nullptr."

1 Apr 2023 by Member 15925018

I use isf (type: IShellFolder* defined in ShlObjDl_Core.h) to use ParseDisplayName because it's a nonstatic member of IShellFolder, so it must be relative to a specific object. But, when I use that code: IShellFolder* isf; LPITEMIDLIST lprnt = {...

I get always an error "exception thrown: read access violation. Isf was nullptr."

1 Apr 2023 by KarstenK

As Richard already wrote, you are missing some basics. To kickstart read the Microsoft documentation. Such stuff isnt a walk in the park, so you must understand the complex topic. Good luck. Here is some interesting stuff on github. When...

I get always an error "exception thrown: read access violation. Isf was nullptr."

1 Apr 2023 by Richard MacCutchan

Similar to your previous question at I get always an error "exception thrown: write access violation. Lpsh was nullptr."[^]. But in this case you create a pointer but you do not initialise it to point to anything. If you do not understand...

How to declare a DWORD ?

30 Mar 2023 by Saleh 2023

What is wrong with this code line ? DWORD quantityXreserved; // I think there is a proper format // For the variable name // "quantityXreserved" , but // I donot know how exactly I am getting this error : Intellisence identifier "DWORD" is...

How to declare a DWORD ?

30 Mar 2023 by cute_friend7077

typedef unsigned long DWORD;

How to declare a DWORD ?

27 Mar 2023 by merano99

For Windows data types you should include windows.h.

gbCapture - Extract Protected Document Content

21 Mar 2023 by gbeene

Capture protected document content as text without the need for breaking DRM

How do I fix "severity code description project file line suppression state error (active) E0167 argument of type "LPSTR" is incompatible with parameter of type "LPCWSTR""?

12 Mar 2023 by JacobLaw1

How do I fix "Severity Code Description Project File Line Suppression State Error (active) E0167 argument of type "LPSTR" is incompatible with parameter of type "LPCWSTR""? LPSTR lpsz; HWND handle, handle2; handle = FindWindowA(NULL,...

How do I fix "severity code description project file line suppression state error (active) E0167 argument of type "LPSTR" is incompatible with parameter of type "LPCWSTR""?

12 Mar 2023 by Dave Kreskowiak

You're retrieving the window text with GetWindowTextA, which will return an ANSI string, which is an array of single byte characters. LPSTR stands for "Long Pointer To Ansi String." The "Long" is a remnant from the old days of DOS, Windows 3.x,...

How do I fix "severity code description project file line suppression state error (active) E0167 argument of type "LPSTR" is incompatible with parameter of type "LPCWSTR""?

12 Mar 2023 by merano99

If you already use = FindWindowA() and GetWindowTextA(), why not MessageBoxA() as well? If you use C++ you should also think about using std::string and std::wstring.

How do I fix "severity code description project file line suppression state error (active) E0167 argument of type "LPSTR" is incompatible with parameter of type "LPCWSTR""?

12 Mar 2023 by Rick York

It appears that you have UNICODE defined. You call FindWindowA and GetWindowTextA which both take a MBCS character string. Then MessageBox is called and it takes a Unicode OR MBCS string, depending on whether UNICODE is defined. If you call...

How do I print the gettitlebarinfo() title in a message box?

11 Mar 2023 by JacobLaw1

How do I print the GetTitleBarInfo() title in a message box? What I have tried: I need to somehow work with the pointer PTITLEBARINFO pTi; in BOOL GetTitleBarInfo(handle, pTi);

How do I print the gettitlebarinfo() title in a message box?

11 Mar 2023 by Dave Kreskowiak

Ummm... GetTitleBarInfo does NOT get the text of the title bar of a window. It returns a RECT structure that describes the bound of the title bar, and array of 6 integers indicating the state of certain title bar elements. Did you not read the...

A Little Update to Picture Slide Puzzle

5 Mar 2023 by spidergeuse

Customize jigsaw (size and picture)

ChatGPT-API for Windows: Use ChatGPT in your Windows Applications

2 Mar 2023 by Michael Chourdakis

Quicky generate text and images

ResizableLib - A Set of Classes to Ease the Development of Resizable Windows with MFC

3 Feb 2023 by Paolo Messina

Class library to make development of resizable windows a easier for the MFC developer and pleasant for the user

Shell_notifyicon & NOTIFYICONDATA

23 Jan 2023 by vikramlinux

We are trying to use Shell_NotifyIcon along with NOTIFYICONDATA structure. On Window 10, We are seeing that if we try to display the balloon notification area along with Title ICON , the ICON gets copied to temp folder everytime it is displayed. It is possible to avoid this ? We have certain use...

Shell_notifyicon & NOTIFYICONDATA

23 Jan 2023 by Member 11229828

#include int main() { // Create a NOTIFYICONDATA structure NOTIFYICONDATA nid; ZeroMemory(&nid, sizeof(nid)); nid.cbSize = sizeof(nid); nid.hWnd = NULL; nid.uID = 1; nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP; ...

How to draw an unicode characters by using win32 gdi ?

12 Jan 2023 by Yount_0701

When I try to draw a string in win32 program, there are some APIs like TextOut or DrawText and so on. If I want to draw a string of unicode which using wchar_t string, I should define the UNICODE marco. It works well untill some special...

How to draw an unicode characters by using win32 gdi ?

12 Jan 2023 by Rick York

Yes, I have done this and the key is to use a font that depicts those characters the way you want. Try the Character Map application to see what they look like in various fonts. When you find a font that you like then you can create it and...

How to refresh combobox items at runtime when combobox itemsource is binded to a list in WPF?

1 Jan 2023 by Graeme_Grant

For Data Binding[^], you use an ObservableCollection[^] class, not a List. UPDATE The trick with Data Binding[^] is not to replace the collection with a new collection, but to clear and add to the collection. Replacing the collection will...

How to refresh combobox items at runtime when combobox itemsource is binded to a list in WPF?

31 Dec 2022 by Member 15061773

Hi there, I have a WPF application where I use a ComboBox. My ComboBox ItemSource is bind to a List which I populate from C# in background. Here is the C# code of that List : // Main code List devices = new...

The Current Thread Handle

27 Dec 2022 by Bruno van Dooren

What to do when you want to use the current thread handle

Implementing an Asynchronous Named Pipe Server - Part 2

22 Dec 2022 by Bruno van Dooren

How to implement named pipe server for communicating with client apps

Implementing an Asynchronous Named Pipe Server - Part 1

9 Dec 2022 by Bruno van Dooren

How to implement named pipe server for communicating with client apps

Win32 Programming: Dealing with Variable Size Structs When Making API Calls

24 Nov 2022 by Bruno van Dooren

When calling into the win32 API, there are many times when you must deal with structures that have a variable size. This article shows how to do that in a convenient way.

How to manipulate the tooltip of a standard win32 frame ?

20 Nov 2022 by Richard MacCutchan

See Using Tooltip Controls - Win32 apps | Microsoft Learn[^]. Also Tooltip Control Messages - Win32 apps | Microsoft Learn[^].

How to manipulate the tooltip of a standard win32 frame ?

20 Nov 2022 by Yount_0701

In the non-client area of a standard win32 window, there would be three little buttons like maximize, minimize,close. When you put your cursor in these areas for some seconds, there would be a tooltip explaining the area for the area which your...

Using C++ Move Semantics to Manage Pointers to Externally Allocated Memory

3 Nov 2022 by Bruno van Dooren

The win32 subsystem often returns pointers to objects that need to be deallocated by the caller. In this article, I show a way to do this reliably and in an exception-safe manner.

memory-management