长株潭城际铁路定价:截图保存

 HBITMAP CopyScreenToBitmap(int &nWidth, int &nHeight)
{
// 屏幕和内存设备描述表
HDC  hScrDC, hMemDC;      
// 位图句柄
HBITMAP  hBitmap, hOldBitmap;    
// 屏幕分辨率
int  xScrn, yScrn;         

//为屏幕创建设备描述表
hScrDC = CreateDC(_T("DISPLAY"), NULL, NULL, NULL);
//为屏幕设备描述表创建兼容的内存设备描述表
hMemDC = CreateCompatibleDC(hScrDC);
// 获得屏幕分辨率
xScrn = GetDeviceCaps(hScrDC, HORZRES);
yScrn = GetDeviceCaps(hScrDC, VERTRES);
 
//存储屏幕的长宽
nWidth = xScrn;
nHeight = yScrn;

// 创建一个与屏幕设备描述表兼容的位图
hBitmap = CreateCompatibleBitmap(hScrDC, xScrn, yScrn);
// 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, xScrn,yScrn,hScrDC, 0, 0, SRCCOPY);

SaveDCToBMP(hMemDC,0,0,nWidth,nHeight,_T("\\TheScreen.bmp"));
 
//得到屏幕位图的句柄
hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);
//清除 
DeleteDC(hScrDC);
DeleteDC(hMemDC);
// 返回位图句柄
return hBitmap;
}
 
BOOL SaveDCToBMP(HDC hDC,int nStartX,int nStartY,int nWidth,int nHeight,LPCTSTR szFileName)
{
//定义图形色深
int iPixel = 32;
//位图信息头
LPBITMAPINFO lpbmih = new BITMAPINFO;
lpbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
lpbmih->bmiHeader.biWidth = nWidth;
lpbmih->bmiHeader.biHeight = nHeight;
lpbmih->bmiHeader.biPlanes = 1;
lpbmih->bmiHeader.biBitCount = iPixel;
lpbmih->bmiHeader.biCompression = BI_RGB;
lpbmih->bmiHeader.biSizeImage = 0;
lpbmih->bmiHeader.biXPelsPerMeter = 0;
lpbmih->bmiHeader.biYPelsPerMeter = 0;
lpbmih->bmiHeader.biClrUsed = 0;
lpbmih->bmiHeader.biClrImportant = 0;
lpbmih->bmiColors[1].rgbBlue=8;
lpbmih->bmiColors[1].rgbGreen =8;
lpbmih->bmiColors[1].rgbRed =8;
lpbmih->bmiColors[1].rgbReserved =8;

//创建位图数据
HDC hdcMem;
HBITMAP hBitMap = NULL;
CBitmap *pBitMap = NULL;
CDC *pMemDC = NULL;
//BYTE *pBits;
//hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_PAL_COLORS,(void **)&pBits,NULL,0);
LPVOID pBits;
hdcMem = CreateCompatibleDC(hDC);
hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_RGB_COLORS,&pBits,NULL,0);
if(!hBitMap)
{
CString lpMsgBuf="init error str(frx savebmp)";
FormatMessage( 
FORMAT_MESSAGE_ALLOCATE_BUFFER | 
FORMAT_MESSAGE_FROM_SYSTEM | 
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
0, // Default language
(LPTSTR)(LPCTSTR)lpMsgBuf,
0,
NULL 
);
AfxMessageBox((LPCTSTR)lpMsgBuf);
// Free the buffer.
return false;
}
pBitMap = new CBitmap;
pBitMap->Attach(hBitMap);
pMemDC = new CDC;
pMemDC->Attach(hdcMem);
pMemDC->SelectObject(pBitMap);

pMemDC->BitBlt(0,0,nWidth,nHeight,CDC::FromHandle(hDC),nStartX,nStartY,SRCCOPY);
BITMAPFILEHEADER bmfh;//位图文件头
ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));
*((char *)&bmfh.bfType) = 'B';
*(((char *)&bmfh.bfType) + 1) = 'M';
bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
bmfh.bfSize = bmfh.bfOffBits + (nWidth * nHeight) * iPixel / 8;
int iBMPBytes = nWidth * nHeight * iPixel / 8;
CFile file;
if(file.Open(szFileName,CFile::modeWrite | CFile::modeCreate))
{
file.Write(&bmfh,sizeof(BITMAPFILEHEADER));
file.Write(&(lpbmih->bmiHeader),sizeof(BITMAPINFOHEADER));
file.Write(pBits,iBMPBytes);
file.Close();
}
else return false;
DeleteObject(hBitMap);
DeleteObject(hDC);
pMemDC->DeleteDC();
delete pMemDC; pMemDC = NULL;
delete pBitMap; pBitMap = NULL;
delete lpbmih; lpbmih = NULL;
return true;
} 

CopyScreenToBitmap是将当前屏幕保存为图片的代码。
SaveDCToBMP是将DC保存为图片文件的公用函数。