帮忙解释下这个代码段

[sycnick]

HDC desktop_dc = GetDC(GetDesktopWindow());
hdcCompatible = CreateCompatibleDC(desktop_dc);

BITMAPINFO binfo;
memset(&binfo,0, sizeof(binfo));
binfo.bmiHeader.biSize = sizeof(binfo);
binfo.bmiHeader.biPlanes = 1;
binfo.bmiHeader.biBitCount = 32;
binfo.bmiHeader.biCompression = BI_RGB;
binfo.bmiHeader.biHeight = height;
binfo.bmiHeader.biWidth = width;

hBitmap = CreateDIBSection(hdcCompatible, &binfo, DIB_RGB_COLORS, &frame_buffer, NULL, 0);
SelectObject(hdcCompatible, hBitmap);
bm_width = width;
bm_height = height;

::SetMapMode(hdcCompatible, MM_TEXT);

return frame_buffer;

特别是hdcCompatible 和 CreateDIBSection

[sycnick]

ok!搞定，结帖!大家快来接分！

[DentistryDoctor]

以双缓冲方式在桌面上作图。

[i_noname]

我怎么觉得象是抓图啊