hbitmap

I have been searching in Google and Stack Overflow , and I cannot find a working example. I need to convert a HBitmap to a Managed .NET bitmap, but the following code does not preserve the alpha channel . private static Bitmap GetBitmapFromHBitmap(IntPtr nativeHBitmap) { Bitmap bmp = Bitmap.FromHbitmap(nativeHBitmap); return bmp; } I found this answer in SO , but it does not work for me, the example preserves the transparency, however it flips my image 180º in Y axis and also rotate it 180º. I don't know why. This other example seems to work, but it is C++ Someone has this working in C#, and

Hello i have the following function which i use afterwards from c# to display a bitmap with "Bitmap.FromHbitmap(IntPtr)" but after a few usages this ends with a memory leak . IntPtr GetFrame(int Width,int Height,int nFrame) { width= Width; height = Height; HBITMAP hb; m_piHelper->GetBmp(width,height,nFrame,&hb); return IntPtr(hb); } Probably i should deleteobject somewere but i dont know where i could do that i tried before return but i end up with no image but a gdi error Thank you, I assume you are using C#. You can use DeleteObject to delete this HBITMAP. Declare it like this: using System

Now that QPixmap::toWinHBITMAP() has been deprecated, I can't find a way to get an HBITMAP from a QPixmap (or QImage). Googling, I found there's a function called qt_pixmapToWinHBITMAP() which seems would do what I need, but I can't find what module I should enable -if any- in my .pro file or what header I should include to use it, or perhaps something else. The reason I need a HBITMAP is to create a video using VFW. Of course, I'd love to be able to do that using only Qt. There's the QtMultimedia module, but as far as I can tell it doesn't export video, so I guess I'm stuck with using the

How can I get image bytes from hbitmap if I am given an HBITMAP pointer, and my application is console application. I tryed using GetDIBits which require such parameter as HDC, which I can't get. EDIT: I load bitmap from file: HBITMAP bm = 0; BITMAP Bitmap; bm = (HBITMAP)LoadImage (0, TEXT("C:\\img1.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); I pass the HBITMAP to the function and expect to get another HBITMAP of processed image: HBITMAP out1 = func(bm); Where func is: HBITMAP func(HBITMAP im); And the problem is how to get image bytes from HBITMAP. See new answer since question was edited...

I have some handle and I need to close it. There is some places in code, where handle may be closed. So, is this a right way to close handle? HANDLE h; .... if ( h != INVALID_HANDLE_VALUE ) { ::CloseHandle(h); h = INVALID_HANDLE_VALUE; } There is a same question about bitmap handles: HBITMAP hb; .... if ( hb != INVALID_HANDLE_VALUE ) { ::DeleteObject(hb); hb = INVALID_HANDLE_VALUE; } EDIT: I think, there is some misunderstanding. I know CloseHandle is for closing handles. I'd like to know proper way for closing handles. A similar situations occurs with deleting of pointers. Foo *foo = new Foo(