C / C++ / MFC

Re: what is the API that MS Office is calling to save a file under a different name ?

4-Oct-07 6:13

The dialog Office is using has a similar UI to the common dialog.

Office is a 3rd party app (suite). There's no reason MS would publish how
it's doing its dialogs. I have never seen any documentation on
it.

If the info is public, I imagine it would be available in the
Office development[^] documentation somewhere.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

carabutnicolae12344-Oct-07 6:15

carabutnicolae1234

4-Oct-07 6:15

yes agree.

How to draw bitmaps without access to HDC or HWND

hvanzyll4-Oct-07 4:39

Re: How to draw bitmaps without access to HDC or HWND

4-Oct-07 4:39

I need to draw on bitmaps buried deep in a DLL and have no access to HDC or HWND
any attempt to GetDC(NULL) returns a valid pointer but all attempts to draw the bitmap fails.
I'm not using MFC, straight SDK.

Has anyone done this before or know how to implement this?
any help would be appreciated.

Mark Salsbery4-Oct-07 5:56

Re: How to draw bitmaps without access to HDC or HWND

4-Oct-07 5:56

What is a bitmap "buried deep in a DLL"?

You only need an HWND if you're doing something window related.

GetDC() is for obtaining a device context for a window (or the screen).
If you're not drawing there, then that's useless as well.

What are you trying to do?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

hvanzyll4-Oct-07 6:05

Re: How to draw bitmaps without access to HDC or HWND

4-Oct-07 6:05

I'm trying to do on screen display inside a DirectShow filter.
To show buffering messages.
I figured it would be easy to just create a bitmap the size of the output image, then just draw buffering messages and send it off to the render.

Mark Salsbery4-Oct-07 6:19

Re: How to draw bitmaps without access to HDC or HWND [modified]

4-Oct-07 6:19

Assuming you want to use GDI to draw on the video frames...

If you have access to the uncompressed frames before they are rendered,
I would use a DIBSection (see CreateDIBSection).

Create a memory DC (CreateCompatibleDC()), select the DIBSection into it.

For each frame, copy the frame pixel bits into the DIBSection's pixel bits.

Then use GDI to draw to the memory DC.

Copy the pixel bits from the DIBSection back to the frame buffer.

Depending on the renderer you are using, there may be features already there
for overlays.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

hvanzyll4-Oct-07 6:27

Re: How to draw bitmaps without access to HDC or HWND

4-Oct-07 6:27

I'll try that...
only difrence is i'll have to create the buffer first, take the previous frame and color convert it to rgb24
then pass it into the CreateDIBSection
draw the message I want,
then color convert it to YUY2 or what ever output format is beeing used.

HBITMAP CreateDIBSection(
HDC hdc, // handle to DC
CONST BITMAPINFO *pbmi, // bitmap data
UINT iUsage, // data type indicator
VOID **ppvBits, // bit values
HANDLE hSection, // handle to file mapping object
DWORD dwOffset // offset to bitmap bit values
);

it needs a HDC,
I dont' have one...
How do i get one, or do i need a valid value? (pass in NULL?)

edit: just looked into CreateCompatibleDC.
If this handle is NULL, the function creates a memory DC compatible with the application's current screen.
would that be dependent if someone is running their display in 16,24, or 32bit?

-- modified at 12:35 Thursday 4th October, 2007

Mark Salsbery4-Oct-07 6:54

Re: How to draw bitmaps without access to HDC or HWND

4-Oct-07 6:54

hvanzyll wrote:
t needs a HDC,
I dont' have one...

You can pass NULL for the DC when calling CreateDIBSection.
The DC is only used for DIBs requiring a color table, not RGB DIBs.

hvanzyll wrote:
If this handle is NULL, the function creates a memory DC compatible with the application's current screen.
would that be dependent if someone is running their display in 16,24, or 32bit?

The DIBSection will determine the bitmap format so a screen compatible
DC will be fine. Note this is NOT the case with regular DDBs (HBITMAP),
which cannot be selected into an incompatible DC.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

hvanzyll4-Oct-07 6:57

what can send WM_ERASEBKGND?

4-Oct-07 6:57

Thank you for your help on this.
hopefully my schedule will clear up in the next few days and I will get a chance to implement this.

dawka19064-Oct-07 4:05

dawka1906

4-Oct-07 4:05

Hi guys

I am receiving WM_ERASEBKGND in my app's main window event handler. However, i can't find what is in fact sending this event. I know that this may be sent by BeginPaint, when InvalidateRect's last argument is set to true. But, all of InvalidateRect calls in my app are called with false as the last argument, so i know that this is not the case.

Do you know any other functions/cases that are causing WM_ERASEBKGND to be sent to the app?

BR
dwk

Re: what can send WM_ERASEBKGND?

Mark Salsbery4-Oct-07 6:02

WM_DESTROY message does not appear to post on VK_ESCAPE [modified]

4-Oct-07 6:02

Are you doing anything that makes the system mark the window
for repainting, like resizing the window, dragging another window
across it, etc??

If the window is just sitting there, you shouldn't be getting random
WM_ERASEBKGND messages.

Note that any WM_ERASEBKGND handler should return non-zero if
background erasing was handled.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Sauce!4-Oct-07 3:06

Sauce!

4-Oct-07 3:06

I'm following along with tutorials from www.directxtutorial.com[^] and have succesfully gotten a d3d window up and running. The next section of the tutorial covers running the app in fullscreen, without a title bar or an exit button, requiring changes to be made. One of these changes is the inclusion of a KEY_DOWN and KEY_UP macro, allowing me to check the state of any key. This is implemented so that there is a means of closing the app, using the escape key, however upon pressing the escape key, nothing happens. If I change the line if(KEY_DOWN(VK_ESCAPE)) to if(KEY_UP(VK_ESCAPE)) then the app will exit instantly. Can anybody explain what is happening or what might be causing it?

#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)<br />
#define KEY_UP(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)<br />
<br />
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
                                  SNIP!<br />
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
<br />
LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)<br />
{<br />
	switch(msg)<br />
		{<br />
		case WM_CLOSE:<br />
			DestroyWindow(hWnd);<br />
		break;<br />
		case WM_DESTROY:<br />
			Cleanup();<br />
			PostQuitMessage(0);<br />
			return 0;<br />
		case WM_PAINT:<br />
			Render();<br />
			ValidateRect(hWnd, NULL);<br />
<br />
			// check the 'escape' key<br />
			if(KEY_DOWN(VK_ESCAPE))<br />
			PostMessage(hWnd, WM_DESTROY, 0, 0);<br />
			return 0;<br />
		}<br />
	return DefWindowProc(hWnd, msg, wParam, lParam);<br />
}

-- modified at 10:02 Thursday 4th October, 2007

Re: WM_DESTROY message does not appear to post on VK_ESCAPE

led mike4-Oct-07 4:36

led mike

4-Oct-07 4:36

Sauce! wrote:
Can anybody explain what is happening or what might be causing it?

Yes, you can by debugging it and checking the value returned from GetAsyncKeyState()

Re: WM_DESTROY message does not appear to post on VK_ESCAPE

Sauce!4-Oct-07 4:52

Sauce!

4-Oct-07 4:52

unfortunately, I cannot compile in debug as I get errors. I will post these tomorrow. I have been searching about for an article I had a while back that details some of the errors that can occur between a debug or release build and how to fix them, but I've had no luck with that.

Re: WM_DESTROY message does not appear to post on VK_ESCAPE

David Crow4-Oct-07 4:59

David Crow

4-Oct-07 4:59

Sauce! wrote:
I have been searching about for an article I had a while back that details some of the errors that can occur between a debug or release build and how to fix them, but I've had no luck with that.

Perhaps it was this one.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: WM_DESTROY message does not appear to post on VK_ESCAPE

Sauce!4-Oct-07 5:29

Sauce!

4-Oct-07 5:29

YES! Thankyou! Big Grin | :-D

<3 <3 <3 <3 <3

Function Pointer? [modified]

kiranin4-Oct-07 3:01

kiranin

4-Oct-07 3:01

If we declare a function pointer as

typedef void (*myPtr)(void);
myptr NewPtr;

This means that NewPtr is a function pointer of type myptr, where myptr is inturn a function pointer to a function which returns void and takes no function parameters.. then what does the below piece of code mean?

Can somebody please interpret this piece of code for me?

typedef NTSTATUS (NTAPI *pfnNtQueryInformationProcess)(
IN HANDLE ProcessHandle,
IN PROCESSINFOCLASS ProcessInformationClass,
OUT PVOID ProcessInformation,
IN ULONG ProcessInformationLength,
OUT PULONG ReturnLength OPTIONAL
);

pfnNtQueryInformationProcess gNtQueryInformationProcess;

Thanx

-- modified at 9:07 Thursday 4th October, 2007

toxcct4-Oct-07 3:15

toxcct

4-Oct-07 3:15

exactly the same as your code, at the difference that the pfnNtQueryInformationProcess is a typedef to a function pointer to a function which returns a NTSTATUS and gets as parameters a HANDLE, a PROCESSINFOCLASS, a PVOID, an ULONG, and a PULONG...

then you declare a variable gNtQueryInformationProcess of that type so defined...

what don't you understand in this ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

kiranin4-Oct-07 3:25

kiranin

4-Oct-07 3:25

Then it should have been declared as

typedef NTSTATUS (*pfnNtQueryInformationProcess)(
IN HANDLE ProcessHandle,
IN PROCESSINFOCLASS ProcessInformationClass,
OUT PVOID ProcessInformation,
IN ULONG ProcessInformationLength,
OUT PULONG ReturnLength OPTIONAL
);

pfnNtQueryInformationProcess gNtQueryInformationProcess;

What is this NTAPI in between? What is its signifance?

Thanx

toxcct4-Oct-07 3:27

toxcct

4-Oct-07 3:27

kiranin wrote:
What is this NTAPI in between

it is the calling convention... see how it's defined if that interrest you, but it's probably one of these : __stdcall, __fastcall, __cdecl, __thiscall...

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

kiranin4-Oct-07 3:37

kiranin

4-Oct-07 3:37

hm.. yeah dats rite.. its a calling convention.. herez the piece of code frm winnt.h

#if ((_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED)) && !defined(_M_AMD64)
#define NTAPI __stdcall
#else
#define _cdecl
#define NTAPI
#endif

Thanx Smile | :)