如何获取窗口工作区的每个像素的RGB值数组

Question

有没有一种方法可以使用gdi接收窗口工作区中每个像素的颜色值？

Answer 1

As noted in comment by @JerryCoffin. Here's a simple example

hDC = GetDC(hwnd);
hBitmap = CreateCompatibleBitmap(hDC, width, height);
hMemDC = CreateCompatibleDC(hDC);
hOld = SelectObject(hMemDC, hBitmap);
BitBlt(hMemDC, 0, 0, width, height, hDC, x, y, SRCCOPY);

// Clean up
DeleteDC(hMemDC);
ReleaseDC(hwnd, hDC);

You should have a bitmap object selected into memory DC for which you can use GetPixel GDI function and then you can also extract the color values using GetRValue() , GetGValue() , and GetBValue() macros.