Use WindowsAPI screenshot and convert to RGB format

capturing a screen image under Windows can have multiple methods, and it's easier to call a third-party library, such as the Qt screenshot API.

Here's how to use the Windows API to implement screenshots and convert to RGB format storage.

#include <windows.h>//final F's memory layout is Bgra format, need to ensure that the BUF length is sufficient (>w*h*4) void ScreenCap (void* buf, int* W, int* h) {HWND hdesk    = GetDesktopWindow ();    HDC Hscreen = GetDC (hdesk);    int width = GetDeviceCaps (Hscreen, horzres);    int height = GetDeviceCaps (hscreen, vertres);    if (w! = 0) *w = width;    if (h! = 0) *h = height;    HDC Hdcmem = CreateCompatibleDC (Hscreen);    Hbitmap hbitmap = CreateCompatibleBitmap (hscreen, width, height);    Bitmapinfoheader BMI = {0};    bmi.bisize = sizeof (Bitmapinfoheader);    Bmi.biplanes = 1;    Bmi.bibitcount = 32;    Bmi.biwidth = width;    Bmi.biheight =-height;    Bmi.bicompression = Bi_rgb;    Bmi.bisizeimage = Width*height;    SelectObject (Hdcmem, HBITMAP);    BitBlt (hdcmem, 0, 0, width, height, hscreen, 0, 0, srccopy);    GetDIBits (Hdcmem, hbitmap, 0, height, buf, (bitmapinfo*) &bmi, dib_rgb_colors);    DeleteDC (HDCMEM);    ReleaseDC (Hdesk, Hscreen);    CloseWindow (hdesk); DeleteObject (HBITMAP);}

Use WindowsAPI screenshot and convert to RGB format