wince 下指定区域截图 函数

拿来主义，加了点自己的东西。。可惜不知道为什么无法预览只有一片黑，只能在编辑器中打开查看截图。并且在图片的上部分有白点，有空再去研究

 

 

void CGPSDlg::CopyScreenToBitmap(LPRECT lpRect, const char * filename)
{
HDC hScrDC,  hMemDC;        //屏幕和内存设备描述表     
HBITMAP hBitmap,  hOldBitmap;//位图句柄     
int nX,  nY,  nX2,  nY2;  //选定区域坐标     
int nWidth,  nHeight;        //位图宽度和高度     
int xScrn,  yScrn;          //屏幕分辨率 
   
//为屏幕创建设备描述表 
hScrDC  =  CreateDC(L"DISPLAY",  NULL,  NULL,  NULL); 

// CPaintDC dc(this);
// hScrDC = dc.GetSafeHdc();
//
   
//  获得屏幕分辨率 
xScrn  =  GetDeviceCaps(hScrDC,  HORZRES); 
yScrn  =  GetDeviceCaps(hScrDC,  VERTRES); 
   
//  确保选定区域不为空矩形 
if  (!lpRect  ||  IsRectEmpty(lpRect)) 
{ 
nX  =  0; 
nY  =  0; 
nX2  =  xScrn; 
nY2  =  yScrn; 
} 
else 
{ 
//  获得选定区域坐标 
nX  =  lpRect->left; 
nY  =  lpRect->top; 
nX2  =  lpRect->right; 
nY2  =  lpRect->bottom; 

//确保选定区域是可见的 
if  (nX  <  0) nX  =  0; 
if  (nY  <  0) nY  =  0; 
if  (nX2  >  xScrn) nX2  =  xScrn; 
if  (nY2  >  yScrn) nY2  =  yScrn; 
} 
nWidth  = nX2 - nX; 
nHeight = nY2 - nY; 
   
//为屏幕设备描述表创建兼容的内存设备描述表 
hMemDC  =  CreateCompatibleDC(hScrDC); 
   
//创建一个与屏幕设备描述表兼容的位图 
hBitmap =  CreateCompatibleBitmap (hScrDC, nWidth, nHeight); 
   
//把新位图选到内存设备描述表中 
// hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap); 
   
//  把屏幕设备描述表拷贝到内存设备描述表中 
// BitBlt(hMemDC, 0, 0, nWidth, nHeight,hScrDC, nX, nY, SRCCOPY); 
   
//TextOut(hMemDC,100, 100,L"Rigel",sizeof("Rigel")); 
   
BYTE *lpBitmapBits = NULL;

BITMAPINFO RGB24BitsBITMAPINFO;
ZeroMemory(&RGB24BitsBITMAPINFO, sizeof(BITMAPINFO));
RGB24BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    RGB24BitsBITMAPINFO.bmiHeader.biWidth = nWidth;
    RGB24BitsBITMAPINFO.bmiHeader.biHeight = nHeight;
    RGB24BitsBITMAPINFO.bmiHeader.biPlanes = 1;
    RGB24BitsBITMAPINFO.bmiHeader.biBitCount = 24;

//得到屏幕位图的句柄 
// hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap); 

    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, nWidth, nHeight, hScrDC, nX, nY, 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 + ((nWidth*nHeight)*3); ///3=(24 / 8)

//write into file const TCHAR *
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*nWidth*nHeight, 1, mStream);
//close file
fclose(mStream);
}
   
//清除   
DeleteDC(hScrDC); 
DeleteDC(hMemDC); 
}

 

举例子：

 

   const char filename[] = "//Storage Card//1.bmp";
   CopyScreenToBitmap(m_rect[m_prePick], filename);