EVC实现WIN CE下截屏

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转自:
    http://www.write100.com/blog/user/erran/archives/2006/4000.html
该作者联系方式:
    Email：erranlz@163.com
    MSN：erranlz@hotmail.com
注:
    只转了代码,原贴心得未转
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void OnScreenSave(const char *filename)
{
 HDC  hScrDC, hMemDC;        
    int  width, height;
 
 //the pointer will save all pixel point's color value
 BYTE  *lpBitmapBits = NULL;
       
 //creates a device context for the screen device
    hScrDC = CreateDC(_T("DISPLAY"), NULL, NULL, NULL);

 //get the screen point size
    width = GetDeviceCaps(hScrDC, HORZRES);
    height = GetDeviceCaps(hScrDC, VERTRES);

    //creates a memory device context (DC) compatible with the screen device(hScrDC) 
    hMemDC = CreateCompatibleDC(hScrDC);

 //initialise the struct BITMAPINFO for the bimap infomation，
 //in order to use the function CreateDIBSection
 //on wince os, each pixel stored by 24 bits(biBitCount=24)
 //and no compressing(biCompression=0)
    BITMAPINFO RGB24BitsBITMAPINFO;
    ZeroMemory(&RGB24BitsBITMAPINFO, sizeof(BITMAPINFO));
    RGB24BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    RGB24BitsBITMAPINFO.bmiHeader.biWidth = width;
    RGB24BitsBITMAPINFO.bmiHeader.biHeight = height;
    RGB24BitsBITMAPINFO.bmiHeader.biPlanes = 1;
    RGB24BitsBITMAPINFO.bmiHeader.biBitCount = 24;
  
 //use the function CreateDIBSection and SelectObject
 //in order to get the bimap pointer : lpBitmapBits
    HBITMAP directBmp = CreateDIBSection(hMemDC, (BITMAPINFO*)&RGB24BitsBITMAPINFO,
    DIB_RGB_COLORS, (void **)&lpBitmapBits, NULL, 0);
 HGDIOBJ previousObject = SelectObject(hMemDC, directBmp);

 // copy the screen dc to the memory dc
 BitBlt(hMemDC, 0, 0, width, height, hScrDC, 0, 0, SRCCOPY);
 
 //if you only want to get the every pixel color value,
 //you can begin here and the following part of this function will be unuseful;
 //the following part is in order to write file;

 //bimap file header in order to write bmp file
 BITMAPFILEHEADER bmBITMAPFILEHEADER;
 ZeroMemory(&bmBITMAPFILEHEADER, sizeof(BITMAPFILEHEADER));
 bmBITMAPFILEHEADER.bfType = 0x4d42;  //bmp 
    bmBITMAPFILEHEADER.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    bmBITMAPFILEHEADER.bfSize = bmBITMAPFILEHEADER.bfOffBits + ((width*height)*3); ///3=(24 / 8)
 
 //write into file
 FILE *mStream = NULL;
 if((mStream = fopen(filename, "wb")))
 { 
  //write bitmap file header
  fwrite(&bmBITMAPFILEHEADER, sizeof(BITMAPFILEHEADER), 1, mStream);
  //write bitmap info
  fwrite(&(RGB24BitsBITMAPINFO.bmiHeader), sizeof(BITMAPINFOHEADER), 1, mStream);
  //write bitmap pixels data
  fwrite(lpBitmapBits, 3*width*height, 1, mStream);
  //close file
  fclose(mStream);
 }
 
 //delete
 DeleteObject(hMemDC);
 DeleteObject(hScrDC);
 DeleteObject(directBmp);
 DeleteObject(previousObject);

}

//测试代码:

int WINAPI WinMain( HINSTANCE hInstance,
     HINSTANCE hPrevInstance,
     LPTSTR    lpCmdLine,
     int       nCmdShow)
{
  // TODO: Place code here. 
 const char  filename[] = "screen.bmp";
 OnScreenSave(filename);
 return 0;
}