Comments by 11917640 Member

11917640 Member 22-Feb-23 2:47am View

And the last thing, I can think about. I would try to divide this algorithm to the high level (how to draw the screen, when I don't have enough memory to do this with one bitmap), and low level (dirty implementation details). Your render function seems to work on both levels, and looks [a bit] complicated.

11917640 Member 22-Feb-23 2:31am View

So, how can you redraw the whole screen? Probably, by divining it by subrectangles, that you can draw at once. For each subrectangle, you need to draw background, then ask every control, that intersrcts with this subrectangle, to draw itself. Makes sense? Maybe, this way can produce better rendering algorithm?

11917640 Member 22-Feb-23 2:28am View

Probably, you need the function like InvalidateRect, which invalidates some part of the screen, or the whole screen. During rendering, invalidated area must be redrawn, first background, then controls. Control needs to know, how to draw itself with some offset, probably including the situation, when some part of the control is out of destination bitmap.

11917640 Member 22-Feb-23 2:25am View

Maybe you need to make one step back and think about the whole algorithm again? I understand, that you can render the screen using bitmaps, when bitmap size is less that screen size. Right? You also have some list of controls, hopefully, sorted by z-order. There is also screen background, that needs (or not?) be redrawn.

11917640 Member 8-Dec-22 3:54am View

For rectangle ROI. Fast solution: using DrawFocusRect API. For full solution, see DrawCli MFC code sample.

11917640 Member 8-Dec-22 3:52am View

What is "free ROI"? Non-rectangle?

11917640 Member 14-Nov-22 5:41am View

From my last comment: Actually, FILTER_MESSAGE_HEADER is quite simple structure, so you can define lpMessageBuffer as ByRef FilterMessageHeader, and forget about manual marshalling tricks.

11917640 Member 14-Nov-22 3:16am View

Use Marshal.StructureToPtr to fill unmanaged memory block before FilterGetMessage call (if necessary). Use Marshal.PtrToStructure to read data from unmamanged memory block after FilterGetMessage call. Actually, FILTER_MESSAGE_HEADER is quite simple structure, so you can define lpMessageBuffer as ByRef FilterMessageHeader, and forget about manual marshalling tricks.

11917640 Member 14-Nov-22 3:16am View

Define lpMessageBuffer parameter as IntPtr. Create unmanaged memory block using Marshal.AllocHGlobal(Marshal.SizeOf<filtermessageheader>()). When finished, don't forget to release it using Marshal.FreeHGlobal.

11917640 Member 14-Nov-22 3:16am View

Write PINvoke declaration of FILTER_MESSAGE_HEADER structure according to this page: https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/fltuserstructures/ns-fltuserstructures-_filter_message_header Public Structure FilterMessageHeader {...}

11917640 Member 14-Nov-22 1:15am View

I don't see in your code anything about FILTER_MESSAGE_HEADER, see https://learn.microsoft.com/en-us/windows/win32/api/fltuser/nf-fltuser-filtergetmessage and https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/fltuserstructures/ns-fltuserstructures-_filter_message_header. Also, if you don't use overlapped IO, lpOverlapped may be declared as IntPtr and set to IntPtr.Zero.

11917640 Member 14-Nov-22 0:25am View

ByRef messageBuffer As IntPtr - remove ByRef . FilterGetMessage requires pointer to buffer, and you pass pointer to pointer to buffer.

11917640 Member 14-Nov-22 0:21am View

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Show declaration of native functions FilterConnectCommunicationPort, FilterGetMessage from fltlib.dll.

11917640 Member 7-Nov-22 6:44am View

return (b & (~a));

11917640 Member 31-Oct-22 5:59am View

Subscribe to SerialPort DataReceived event.

11917640 Member 27-Oct-22 7:12am View

So, you have two timers set at the same time and with same period. Why do you need two timers and not one, that makes all actions in the desired order?

11917640 Member 28-Sep-22 1:53am View

Languages vs Language.

11917640 Member 25-Jul-22 0:08am View

Again, write client code first in C/C++. It is difficult to solve both the problems with driver communication and .NET interoperability at the same time.

11917640 Member 24-Jul-22 8:49am View

I see at least one PInvoke problem: ByRef overlapped As IntPtr, should be without ByRef. I think you need to write first native client, having it working, translate it to VB. One problem at time.

11917640 Member 24-Jul-22 8:42am View

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scanf("%c", &command);

11917640 Member 21-Jul-22 6:00am View

In deriv2 function: int j,deg2,deg; deg2=deg-1; - deg is not initialized. Don't ignore compiler warnings.

11917640 Member 13-Jul-22 1:56am View

Notepad++, main menu, Language - select required language.

11917640 Member 30-Jun-22 3:58am View

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You have local variable NumberOfBytesWritten. You pass the pointer to it to the function WriteFile. WriteFile fills it with number of bytes written. That's all, nothing to clear. Your code is correct.

11917640 Member 23-Jun-22 4:27am View

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DeviceParameters structure and its sub-structures are simple POD types, you don't need to use low-level Marshal memory management functions.

11917640 Member 23-Jun-22 4:24am View

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BOOL SetDeviceParameters( DWORD DeviceID, DeviceParameters DeviceParam ) - DeviceParam is not pointer, so your C# declaration IntPtr DeviceParam is wrong. Create C# DeviceParameters structure (not class), define it as StructLayout(LayoutKind.Sequential), and pass it by value.

11917640 Member 22-Mar-22 9:24am View

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If you are using SO_KEEPALIVE, read this article: https://holmeshe.me/network-essentials-setsockopt-SO_KEEPALIVE/ Is this what are you looking for?

11917640 Member 15-Feb-22 8:40am View

StopWatch is not exactly C...

11917640 Member 27-Jan-22 3:37am View

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Activity Activities[] = ... Why do you need this array if it is not used?

11917640 Member 6-Dec-21 8:59am View

cppreference contains similar example: alignas(64) char cacheline[64]; Did you try to set alignas in the beginning?

11917640 Member 25-Nov-21 0:19am View

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Articles - Browse topics - Desktop programming - ...

11917640 Member 11-Oct-21 4:59am View

Impossible to say anything without code. However, using OnPaint looks a bit strange - CTreeCtrl is able to draw itself, just fill it with nodes.

11917640 Member 11-Oct-21 2:53am View

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You can use ostringstream in C++ instead of StringBuilder. Use << operator which works like StringBuilder.append. Finally, use str() function to convert ostringstream to string.

11917640 Member 2-Sep-21 3:38am View

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Take the whole desktop bitmap. Create top-most window which covers the desktop, with black background, and draw this bitmap on it by the way you need. Though, as mentioned in previous comments, the proper way to implement this is to write screen saver.

11917640 Member 1-Sep-21 10:17am View

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Did you try casting? Topic topicType = static_cast<Topic>(record["topic"].asInt());

11917640 Member 22-Aug-21 10:17am View

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You already have checkWin and board forward declarations before main function. Do the same with load and save.

11917640 Member 17-Aug-21 0:19am View

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You ask boost to serialize vector of pointers: check. When deserialized, these pointers point to nowhere. If you want to have simple serialization code, replace it with vector of instances.

11917640 Member 6-Jul-21 8:00am View

Publisher is TCP server, subscriber is client. Subscriber doesn't bind to the port.

11917640 Member 6-Jul-21 8:00am View

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Publisher is TCP server, subscriber is client. Subscriber doesn't bind to the port.

11917640 Member 6-Jul-21 4:46am View

For clarity: publisher address tcp://*:5555 means: all available NICs (including localhost), publisher is bound to port 5555. Subscriber address tcp://localhost:5555 means: connect to localhost, port 5555.

11917640 Member 5-Jul-21 6:57am View

Do you mean: on the same computer? Try address tcp://*:5555 for publisher and tcp://localhost:5555 for subscriber.

11917640 Member 30-May-21 9:39am View

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https://en.wikipedia.org/wiki/Garbage_collection_(computer_science)#Reference_counting

11917640 Member 19-May-21 8:51am View

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What happens if you run the program as Administrator (even if you are in Administrator account)?

11917640 Member 18-May-21 4:10am View

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Get main function here: https://holowczak.com/getting-started-with-windows-forms-using-visual-c-tutorial/2/ and add it to any .cpp file in the project. Replace Form1 with mainWindow, according to your class name.

11917640 Member 2-May-21 0:23am View

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This is just Dll with native interface, which internally uses .NET in methods implementation. Do you know, how to make native Dll?

11917640 Member 22-Apr-21 0:51am View

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All this code is from MFC, which is supposed to work, if used correctly. What is the project code that causes the crash? Try to make the same action in new MFC project, or find the sample which does similar action, and compare the code.

11917640 Member 18-Mar-21 4:36am View

Global variable is defined as bstNode_t*. Function is defined as search(bstNode_t* root) This function can change the data pointed by root parameter (such as int data), but not the pointer itself. To change the pointer, function parameter must be defined as bstNode_t** You may be confused also by the same parameter and global variable name. To understand this code better, rename root parameter to something else.

11917640 Member 2-Feb-21 9:49am View

myarray in your code is jagged array. See the difference here: https://docs.microsoft.com/en-us/cpp/dotnet/how-to-use-arrays-in-cpp-cli?view=msvc-160 multi-dimension managed array vs jagged array.

11917640 Member 2-Feb-21 9:36am View

You need to pin pointer for every line.

11917640 Member 2-Feb-21 4:52am View

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The answer is probably in BST class. If it has operator[] overloaded, second[i][j] calls it. If not, probably the map second member is array of arrays (or 2D array) of BST instances, and second[i][j] dereferences required BST instance in this array.

11917640 Member 15-Nov-20 6:40am View

Run portmon program https://docs.microsoft.com/en-us/sysinternals/downloads/portmon and compare behavior of working and non-working programs.

11917640 Member 14-Jul-20 9:39am View

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BTW, what is the point of loading MFC Dll with LoadLibrary? Usually LoadLibrary is applied to Dll having plain extern C functions. Looks like the best solution for this case is to run away from this problem and use normal non-MFC Dll.

11917640 Member 14-Jul-20 9:36am View

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You can use theApp instead of AfxGetApp. Make search for AFX_MANAGE_STATE, if you want real solution. This is not memory corruption (unless you have some really bad Dll initialization code), this is some MFC state management problem.

11917640 Member 6-Jul-20 8:07am View

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NotifyHandlerXP is never called.

11917640 Member 18-Dec-19 9:49am View

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Well, "OpenGL C++/CLI" Google search gives several options, this one seems to be interesting: https://www.codeproject.com/Articles/16051/Creating-an-OpenGL-view-on-a-Windows-Form

11917640 Member 17-Dec-19 1:04am View

GLUT is simple lightweight GUI framework for using (and mostly learning) OpenGL. If you want to use OpenGL in UI program (Windows API, C++/CLI, MFC or any other UI toolkit), use OpenGL directly without GLUT.

11917640 Member 4-Dec-19 10:05am View

You can use Microsoft XmlLite SDK: https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms752861(v=vs.85) IXMlReader::GetLineNumber is the feature you need: https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms752834%28v%3dvs.85%29 However, XmlLite is relatively low-level SDK, and parsing XML document is not easy. You cannot load the whole document at once, and need to build the parsing logic in the program.

11917640 Member 27-Nov-19 10:48am View

Try DBT_DEVICEREMOVECOMPLETE.

11917640 Member 29-Aug-19 8:25am View

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See also: https://software.intel.com/en-us/articles/enable-10bpp (Intel® Media SDK) and https://www.amd.com/system/files/documents/10-bit-video-output.pdf (AMD’s 10-bit Video Output Technology).

11917640 Member 29-Aug-19 8:23am View

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Do you have some specific problems with Nvida examples? Generally, you need to use OpenGL or Direct3D. And you need to have graphic card and monitor with 10 bit support.

11917640 Member 13-Aug-19 3:43am View

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%6 is 2^6 = /64. Just another display format. You can see such notation, for example, typing ipconfig in the command prompt. BTW, how this question is related to programming?

11917640 Member 11-Aug-19 5:32am View

The only reason I can see is incorrect handle value passed to CloseHandle. In such case, CloseHandle result is undefined.

11917640 Member 16-Apr-19 1:04am View

You can change the /SUBSYSTEM parameter from Windows to Console (if this causes linker error, change also /ENTRY parameter). Or just use OutputDebugString + DebugView https://docs.microsoft.com/en-us/sysinternals/downloads/debugview

11917640 Member 2-Apr-19 10:02am View

GetParameters function has DevParam* parameter. ref IntPtr in C# means that you pass pointer to pointer (DevParam**). It doesn't matter what return value you get now, all this is undefined behavior unless you fix all errors in the code.

11917640 Member 2-Apr-19 9:51am View

There are no "small" errors in PInvoke. Every incorrect definition means undefined behavior.

11917640 Member 2-Apr-19 9:49am View

In the second call ref IntPtr dParam should be IntPtr dParam. So, many small errors in the code, check everything carefully, especially C# - C++ - WinAPI types match.

11917640 Member 2-Apr-19 9:30am View

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All Windows API display solutions are restricted to 8 bpp. There are two technologies that allow to make true 10 bpp display: Direct3D and OpenGL. This also requires 10 bpp support for display adapter + 10 bpp monitor. Both are quite expensive. If you want to implement this, you have a long way to go, Direct3D programming is a bit painful...

11917640 Member 2-Apr-19 9:25am View

C# bool is not equal to WinAPI BOOL. C# char is not equal to C++ char. Check all types in PInvoke C# definitions. Check also, whether GetParameters function works properly when called from C++.

11917640 Member 1-Apr-19 10:23am View

If you are using Qt Creator, it has "C++ Library" item in the File - New File or Project dialog.

11917640 Member 24-Mar-19 2:01am View

Are you trying to use memory-mapped file just to send commands to the driver? Standard way to do this is DeviceIoControl.

11917640 Member 20-Mar-19 2:33am View

If it works under debugger, the difference is probably in the current directory.

11917640 Member 20-Mar-19 2:32am View

https://docs.microsoft.com/en-us/windows/desktop/Dlls/dynamic-link-library-search-order Dynamic-Link Library Search Order, see Standard Search Order for Desktop Applications.
1. The directory from which the application loaded (exe directory). 2. The system directory. 3. The Windows directory. 4. The current directory. 5. PATH

11917640 Member 17-Mar-19 2:01am View

Device doesn't need to use broadcast, it can use sendto having the sender IP.

11917640 Member 12-Mar-19 10:35am View

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Texas Instruments "Finder" utility which comes with one of their SDK contains C++ code that works by such way: enumerate all adapters, bind socket to every adapter, send broadcast messages. Unfortunately, I cannot send you the code, try to find it yourself. FYI, the same can be done using C#, for example: https://stackoverflow.com/questions/1096142/broadcasting-udp-message-to-all-the-available-network-cards

11917640 Member 12-Mar-19 2:58am View

You need to bind UDP socket to the adapter IP address. Using GetIpAddrTable function you can enumerate all adapters and get their addresses.

11917640 Member 26-Feb-19 5:10am View

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Probably steady (monotonic) clock is what are you looking for: https://en.cppreference.com/w/cpp/chrono/steady_clock

11917640 Member 3-Sep-18 2:37am View

Call SetWindowRgn before BitBlt.

11917640 Member 2-Sep-18 4:09am View

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Try to set min and max x to the same value in MINMAXINFO.

11917640 Member 2-Sep-18 1:38am View

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Try to handle WM_GETMINMAXINFO and set minimal and maximal width to the same value.

11917640 Member 13-Aug-18 7:39am View

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The problem is the current directory. If current directory is not where .ico file is placed, your code fails. If .ico file is always in the same directory as .exe, get full .exe name, extract directory from it and make full .ico file name, including this directory.

11917640 Member 13-Aug-18 2:58am View

When program is executed from Visual Studio, current directory is project directory, and not bin/debug. Place .ico file to the project directory, and copy it to bin/debug in post-build event.

11917640 Member 26-Jul-18 2:53am View

Is this your real code? vector<mat> imgs; and Mat img = ... Looks like different types. Show your actual code, and exact error message.

11917640 Member 22-Jul-18 5:55am View

The reason is probably in new window WndProc function, registered with globals->window_class_name.

11917640 Member 19-Jul-18 4:13am View

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Return value of the program goes to %ERRORLEVEL% environment variable and can be tested in a batch file, look here for example: https://stackoverflow.com/questions/6812484/batch-file-test-error-level By returning 4556 you signal to a caller that something was wrong. Usually %ERRORLEVEL% is tested for 0 and this value means success.

11917640 Member 17-Jul-18 7:48am View

Posted.

11917640 Member 17-Jul-18 7:48am View

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Posted.

11917640 Member 17-Jul-18 6:57am View

Yes, it works in this case. After closing the socket accept should unblock and fail.

11917640 Member 17-Jul-18 6:56am View

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Yes, it works in this case. After closing the socket accept should unblock and fail.

11917640 Member 17-Jul-18 3:00am View

You need to close server_socket from another thread, in this case accept function returns immediately.

11917640 Member 17-Jul-18 2:58am View

Delay of stop does not work - this means, something is wrong in TON_2 function. You need to provide more information.

11917640 Member 24-Jun-18 4:44am View

mktime was the function I was looking for. It allows to return from human-readable timestamp back to computer time. Thanks for this hint.

11917640 Member 21-Jun-18 8:09am View

Exactly, timestamp_to_timepoint is my real problem.

11917640 Member 21-Jun-18 7:59am View

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Thanks, I updated my answer by replacing timestamp by time_point. This is quite enough for my purpose.

Comments by 11917640 Member (Top 92 by date)