学步园

将屏幕保存为图片，使用vs2008编译通过。

#include "stdafx.h"<br /> #include <windows.h><br /> #include <atlimage.h></p> <p>int __stdcall WinMain(<br /> HINSTANCE hInstance,<br /> HINSTANCE hPrevInstance,<br /> LPSTR lpCmdLine,<br /> int nShowCmd)<br /> {<br /> HWND hwnd = ::GetDesktopWindow();<br /> HDC hDC = ::GetDC(hwnd);//获取屏幕DC</p> <p> RECT rect;<br /> ::GetClientRect(hwnd, &rect);//获取屏幕大小<br /> HDC hDCMem = ::CreateCompatibleDC(hDC);//创建兼容DC</p> <p> HBITMAP hBitMap = ::CreateCompatibleBitmap(hDC, rect.right, rect.bottom);//创建兼容位图<br /> HBITMAP hOldMap = (HBITMAP)::SelectObject(hDCMem, hBitMap);//将位图选入DC，并保存返回值</p> <p> ::BitBlt(hDCMem, 0, 0, rect.right, rect.bottom, hDC, 0, 0, SRCCOPY);//将屏幕DC的图象复制到内存DC中</p> <p> CImage image;<br /> image.Attach(hBitMap);<br /> image.Save(_T("c://B.jpg"));//如果文件后缀为.bmp，则保存为为bmp格式<br /> image.Detach();</p> <p> ::SelectObject(hDCMem, hOldMap);//选入上次的返回值</p> <p> //释放<br /> ::DeleteObject(hBitMap);<br /> ::DeleteDC(hDCMem);<br /> ::DeleteDC(hDC);</p> <p> return 0;<br /> }<br />

将当前MFC程序（这里是单文档程序）保存为图片，使用vs2005。第一个使用CImage类保存图片，第二个使用BITMAPINFO。

第一个：

void CMainFrame::OnGetMap()<br /> {</p> <p> HWND hwnd = this->GetSafeHwnd();<br /> HDC hDC = ::GetWindowDC(hwnd);//获取DC </p> <p> RECT rect;<br /> ::GetWindowRect(hwnd, &rect);//获取屏幕大小<br /> HDC hDCMem = ::CreateCompatibleDC(hDC);//创建兼容DC </p> <p> HBITMAP hBitMap = ::CreateCompatibleBitmap(hDC, rect.right-rect.left, rect.bottom-rect.top);//创建兼容位图<br /> HBITMAP hOldMap = (HBITMAP)::SelectObject(hDCMem, hBitMap);//将位图选入DC，并保存返回值 </p> <p> ::BitBlt(hDCMem, 0, 0, rect.right-rect.left, rect.bottom-rect.top, hDC, 0, 0, SRCCOPY);//将屏幕DC的图象复制到内存DC中 </p> <p> CImage image;//需要#include <atlimage.h><br /> image.Attach(hBitMap);<br /> image.Save(_T("c://B.jpg"));//如果文件后缀为.bmp，则保存为为bmp格式<br /> image.Detach(); </p> <p> ::SelectObject(hDCMem, hOldMap);//选入上次的返回值 </p> <p> //释放<br /> ::DeleteObject(hBitMap);<br /> ::DeleteDC(hDCMem);<br /> ::DeleteDC(hDC);<br /> }

第二个：

void CMainFrame::OnGetMap()<br /> {</p> <p> CDC* pDC = GetWindowDC();<br /> CBitmap bitmap;<br /> CDC memDC ;<br /> CRect rect;<br /> GetWindowRect(rect);<br /> memDC.CreateCompatibleDC(pDC);</p> <p> bitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());<br /> memDC.SelectObject(&bitmap);<br /> memDC.BitBlt(0,0,rect.Width(),rect.Height(),pDC,0,0,SRCCOPY);</p> <p> CFileDialog fDlg(FALSE,_T("bmp"),NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("位图文件|*.bmp"),this);<br /> if (fDlg.DoModal()==IDOK)<br /> {</p> <p> CString bmpfile = fDlg.GetPathName();</p> <p> CFile file(bmpfile,CFile::modeCreate|CFile::modeWrite);</p> <p> BITMAP bInfo;<br /> bitmap.GetBitmap(&bInfo);</p> <p> //计算调色板大小<br /> int panelsize = 0;<br /> if (bInfo.bmBitsPixel<24) //非真彩色<br /> {<br /> panelsize = pow((double)2,bInfo.bmBitsPixel)*sizeof(RGBQUAD);<br /> }</p> <p> //定义位图信息<br /> BITMAPINFO* bMapInfo = (BITMAPINFO*)LocalAlloc(LPTR,sizeof(BITMAPINFO)+panelsize);<br /> bMapInfo->bmiHeader.biBitCount = bInfo.bmBitsPixel;<br /> bMapInfo->bmiHeader.biClrImportant = 0;<br /> bMapInfo->bmiHeader.biCompression = 0;<br /> bMapInfo->bmiHeader.biHeight = bInfo.bmHeight;<br /> bMapInfo->bmiHeader.biPlanes = bInfo.bmPlanes;<br /> bMapInfo->bmiHeader.biSize = sizeof(BITMAPINFO);<br /> bMapInfo->bmiHeader.biSizeImage = bInfo.bmHeight*bInfo.bmWidthBytes;<br /> bMapInfo->bmiHeader.biWidth = bInfo.bmWidth;<br /> bMapInfo->bmiHeader.biXPelsPerMeter = 0;<br /> bMapInfo->bmiHeader.biYPelsPerMeter = 0;</p> <p> //获取位图的实际数据<br /> char* pData = new char[bMapInfo->bmiHeader.biSizeImage];<br /> int len = GetDIBits(pDC->m_hDC,bitmap,0,bInfo.bmHeight,pData,bMapInfo,DIB_RGB_COLORS);</p> <p> BITMAPFILEHEADER bFileHeader;<br /> bFileHeader.bfType = 0x4D42;<br /> bFileHeader.bfReserved1 = 0;<br /> bFileHeader.bfReserved2 = 0;<br /> bFileHeader.bfSize = sizeof(BITMAPFILEHEADER);<br /> bFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+panelsize;</p> <p> //向文件中写入位图数据<br /> file.Write(&bFileHeader,sizeof(BITMAPFILEHEADER));<br /> file.Write(&bMapInfo->bmiHeader,sizeof(BITMAPINFOHEADER));<br /> file.Write(pData,bMapInfo->bmiHeader.biSizeImage+panelsize);<br /> file.Close();<br /> delete pData;<br /> LocalFree(bMapInfo);<br /> }<br /> bitmap.DeleteObject();<br /> memDC.DeleteDC();</p> <p>}