Fromhbitmap This function will lose transparency information.

In the use of fromhbitmap you will find out the figure is with black edge, this is because this function has a bug, the solution is to use the following function to convert, the general meaning is that you memcpy do not use Fromhbitmap function.

 bitmap* Createbitmapfromhbitmap (in Hbitmap hbitmap) {Bitmap bmp = {0};        if (0 = = GetObject (hbitmap, sizeof (BITMAP), (LPVOID) &bmp)) {return FALSE;        } BYTE *piexlssrc = NULL;        LONG cbsize = bmp.bmwidthbytes * bmp.bmheight;        PIEXLSSRC = new Byte[cbsize];        Bitmapinfo Bmpinfo = {0};        bmpInfo.bmiHeader.biSize = sizeof (Bitmapinfoheader);        BmpInfo.bmiHeader.biWidth = Bmp.bmwidth;         BmpInfo.bmiHeader.biHeight = Bmp.bmheight;        BmpInfo.bmiHeader.biPlanes = Bmp.bmplanes;        BmpInfo.bmiHeader.biBitCount = Bmp.bmbitspixel;        BmpInfo.bmiHeader.biCompression = Bi_rgb;        HDC hdcscreen = CreateDC (L "DISPLAY", NULL, Null,null);        LONG cbcopied = GetDIBits (hdcscreen, hbitmap, 0, Bmp.bmheight, PIEXLSSRC, &bmpinfo, dib_rgb_colors);        DeleteDC (Hdcscreen);            if (0 = = cbcopied) {delete [] piexlssrc;        return FALSE; } Bitmap *pbitmap = new Bitmap (Bmp.bmwidth, Bmp.bmheight, Pixelformat32bpppargb);        BitmapData BitmapData;        Rect rect (0, 0, bmp.bmwidth, bmp.bmheight);        if (Ok! = Pbitmap->lockbits (&rect, Imagelockmoderead, Pixelformat32bpppargb, &bitmapdata))            {Safe_delete (PBITMAP);        return NULL;        } BYTE *pixelsdest = (byte*) bitmapdata.scan0;        int nlinesize = bmp.bmwidth * sizeof (UINT);        int nheight = Bmp.bmheight;                 for (int y = 0; y < nheight; y++) {memcpy_s (pixelsdest + y * nlinesize), nlinesize,        (Piexlssrc + (NHEIGHT-Y-1) * nlinesize), nlinesize);        } if (Ok! = pbitmap->unlockbits (&bitmapdata)) {delete pbitmap;        } delete [] piexlssrc;    return pbitmap; }

　　

Reference information: http://blog.sina.com.cn/s/blog_5f8817250100g1dj.html

Https://groups.google.com/forum/#!topic/microsoft.public.win32.programmer.gdi/stjG06_EPfM

Fromhbitmap This function will lose transparency information.