將屏幕保存爲圖片 將當前MFC程序保存爲圖片 c++ vc

將屏幕保存爲圖片，使用vs2008編譯通過。

#include "stdafx.h" #include <windows.h> #include <atlimage.h> int __stdcall WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) { HWND hwnd = ::GetDesktopWindow(); HDC hDC = ::GetDC(hwnd);//獲取屏幕DC RECT rect; ::GetClientRect(hwnd, &rect);//獲取屏幕大小 HDC hDCMem = ::CreateCompatibleDC(hDC);//創建兼容DC HBITMAP hBitMap = ::CreateCompatibleBitmap(hDC, rect.right, rect.bottom);//創建兼容位圖 HBITMAP hOldMap = (HBITMAP)::SelectObject(hDCMem, hBitMap);//將位圖選入DC，並保存返回值 ::BitBlt(hDCMem, 0, 0, rect.right, rect.bottom, hDC, 0, 0, SRCCOPY);//將屏幕DC的圖象複製到內存DC中 CImage image; image.Attach(hBitMap); image.Save(_T("c://B.jpg"));//如果文件後綴爲.bmp，則保存爲爲bmp格式 image.Detach(); ::SelectObject(hDCMem, hOldMap);//選入上次的返回值 //釋放 ::DeleteObject(hBitMap); ::DeleteDC(hDCMem); ::DeleteDC(hDC); return 0; }

 

 

 

 

將當前MFC程序（這裏是單文檔程序）保存爲圖片，使用vs2005。第一個使用CImage類保存圖片，第二個使用BITMAPINFO。

第一個：

void CMainFrame::OnGetMap() { HWND hwnd = this->GetSafeHwnd(); HDC hDC = ::GetWindowDC(hwnd);//獲取DC RECT rect; ::GetWindowRect(hwnd, &rect);//獲取屏幕大小 HDC hDCMem = ::CreateCompatibleDC(hDC);//創建兼容DC HBITMAP hBitMap = ::CreateCompatibleBitmap(hDC, rect.right-rect.left, rect.bottom-rect.top);//創建兼容位圖 HBITMAP hOldMap = (HBITMAP)::SelectObject(hDCMem, hBitMap);//將位圖選入DC，並保存返回值 ::BitBlt(hDCMem, 0, 0, rect.right-rect.left, rect.bottom-rect.top, hDC, 0, 0, SRCCOPY);//將屏幕DC的圖象複製到內存DC中 CImage image;//需要#include <atlimage.h> image.Attach(hBitMap); image.Save(_T("c://B.jpg"));//如果文件後綴爲.bmp，則保存爲爲bmp格式 image.Detach(); ::SelectObject(hDCMem, hOldMap);//選入上次的返回值 //釋放 ::DeleteObject(hBitMap); ::DeleteDC(hDCMem); ::DeleteDC(hDC); }

 

第二個：

void CMainFrame::OnGetMap() { CDC* pDC = GetWindowDC(); CBitmap bitmap; CDC memDC ; CRect rect; GetWindowRect(rect); memDC.CreateCompatibleDC(pDC); bitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height()); memDC.SelectObject(&bitmap); memDC.BitBlt(0,0,rect.Width(),rect.Height(),pDC,0,0,SRCCOPY); CFileDialog fDlg(FALSE,_T("bmp"),NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("位圖文件|*.bmp"),this); if (fDlg.DoModal()==IDOK) { CString bmpfile = fDlg.GetPathName(); CFile file(bmpfile,CFile::modeCreate|CFile::modeWrite); BITMAP bInfo; bitmap.GetBitmap(&bInfo); //計算調色板大小 int panelsize = 0; if (bInfo.bmBitsPixel<24) //非真彩色 { panelsize = pow((double)2,bInfo.bmBitsPixel)*sizeof(RGBQUAD); } //定義位圖信息 BITMAPINFO* bMapInfo = (BITMAPINFO*)LocalAlloc(LPTR,sizeof(BITMAPINFO)+panelsize); bMapInfo->bmiHeader.biBitCount = bInfo.bmBitsPixel; bMapInfo->bmiHeader.biClrImportant = 0; bMapInfo->bmiHeader.biCompression = 0; bMapInfo->bmiHeader.biHeight = bInfo.bmHeight; bMapInfo->bmiHeader.biPlanes = bInfo.bmPlanes; bMapInfo->bmiHeader.biSize = sizeof(BITMAPINFO); bMapInfo->bmiHeader.biSizeImage = bInfo.bmHeight*bInfo.bmWidthBytes; bMapInfo->bmiHeader.biWidth = bInfo.bmWidth; bMapInfo->bmiHeader.biXPelsPerMeter = 0; bMapInfo->bmiHeader.biYPelsPerMeter = 0; //獲取位圖的實際數據 char* pData = new char[bMapInfo->bmiHeader.biSizeImage]; int len = GetDIBits(pDC->m_hDC,bitmap,0,bInfo.bmHeight,pData,bMapInfo,DIB_RGB_COLORS); BITMAPFILEHEADER bFileHeader; bFileHeader.bfType = 0x4D42; bFileHeader.bfReserved1 = 0; bFileHeader.bfReserved2 = 0; bFileHeader.bfSize = sizeof(BITMAPFILEHEADER); bFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+panelsize; //向文件中寫入位圖數據 file.Write(&bFileHeader,sizeof(BITMAPFILEHEADER)); file.Write(&bMapInfo->bmiHeader,sizeof(BITMAPINFOHEADER)); file.Write(pData,bMapInfo->bmiHeader.biSizeImage+panelsize); file.Close(); delete pData; LocalFree(bMapInfo); } bitmap.DeleteObject(); memDC.DeleteDC(); }