Description: In principle is to capture screen picture then pictures to the client. Principle is very simple:
1, first using HDC detected by FCM (NULL) GetWindowDC = Get the desktop HDC detected by FCM
2, memhdc = CreateCompatibleDC (HDC detected by FCM), According to the desktop HDC detected by FCM create a same memory DC and screen
3 and StretchBlt (0, 0, memhdc, nWid, nHei, 0, 0, HDC detected by FCM, nWid, nHei SRCCOPY) , The screen, the image to the memory when you are already in memory DC got screen image. This is related to the equipment, if hope DDB image converted image of device-independent DIB in DDB images, before creating a BITMAP standard file header can (DDBtoDIB BITMAP, Pal, BI_RGB ().
4 and image data (if consider speed can put the image compression)
5 and data transmission (remote monitoring)
"Here, we ll look at how the desktop is intercepted. About remote capture, just below the basis and network transmission parts with respect to OK. Here is the foundation, the desktop
File list (Check if you may need any files):
屏幕截取.cpp
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