www.gusucode.com > vc++ 远程控制示例源程序-源码程序 > vc++ 远程控制示例源程序-源码程序\code\PeerYouS\CaptureScreen.cpp
// CaptureScreen.cpp: implementation of the CaptureScreen. // Download by http://www.NewXing.com ////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "CaptureScreen.h" ////////////////////////////////////////////////////////////////////// LPSTR lpBmpData=NULL; DWORD dwBmpSize=0; DWORD dwBmpInfoSize=0; int CaptureThreadCount=0; CRITICAL_SECTION csCaptureScreen; int iBmpCX; int iBmpCY; //////////////////////////////////////// //进行扫尾工作,释放内存 void CleanScreenInfo(void) { if(lpBmpData) { GlobalUnlock(lpBmpData); lpBmpData=(char*)GlobalFree(lpBmpData); } dwBmpSize=0; dwBmpInfoSize=0; } //捕捉屏幕数据 bool GetScreenData(int nBits) { //位图位数不能为大于2^24的值,主要考虑到传输特性 if (nBits>24) return false; HDC hScrDC, hMemDC; // 屏幕和内存设备描述表 HBITMAP hBitmap, hOldBitmap; // 位图句柄 int xScrn, yScrn; // 屏幕分辨率 HDC hDC; //设备描述表 WORD wBitCount; //位图中每个像素所占字节数 //定义调色板大小, 位图中像素字节大小 ,位图文件大小 , 写入文件字节数 DWORD dwPaletteSize=0, dwBmBitsSize=0;//,dwBmpInfoSize=0; BITMAP Bitmap; //位图属性结构 BITMAPINFOHEADER bi; //位图信息头结构 LPBITMAPINFOHEADER lpbi; //指向位图信息头结构 //定义文件,分配内存句柄,调色板句柄 HANDLE hDib; HPALETTE hPal,hOldPal=NULL; //为屏幕创建设备描述表 hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL); // 获得屏幕分辨率 xScrn = GetDeviceCaps(hScrDC, HORZRES); yScrn = GetDeviceCaps(hScrDC, VERTRES); //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,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); //得到屏幕位图的句柄 hBitmap = (HBITMAP) SelectObject(hMemDC, hOldBitmap); //计算位图每个像素所占字节数 if (nBits <= 1) wBitCount = 1; else if (nBits <= 4) wBitCount = 4; else if (nBits <= 8) wBitCount = 8; else if (nBits <= 16) wBitCount = 16; else if (nBits <= 24) wBitCount = 24; //计算调色板大小 if (wBitCount <24) dwPaletteSize = (1 << wBitCount) * sizeof(RGBQUAD); //设置位图信息头结构 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap); bi.biSize = sizeof(BITMAPINFOHEADER); bi.biWidth = Bitmap.bmWidth; bi.biHeight = Bitmap.bmHeight; bi.biPlanes = 1; bi.biBitCount = wBitCount; bi.biCompression = BI_RGB; bi.biSizeImage = 0; bi.biXPelsPerMeter = 0; bi.biYPelsPerMeter = 0; bi.biClrUsed = 0; bi.biClrImportant = 0; dwBmBitsSize = ((Bitmap.bmWidth * wBitCount+31)& ~31)/8 *Bitmap.bmHeight; dwBmpInfoSize = dwPaletteSize + sizeof(BITMAPINFOHEADER); //临时位图数据大小变量 DWORD dwNewBmpSize; dwNewBmpSize = dwBmBitsSize + dwBmpInfoSize; iBmpCX=Bitmap.bmWidth; iBmpCY=Bitmap.bmHeight; //为位图内容分配内存 if(dwNewBmpSize!=dwBmpSize)//位图相关信息没有变化 { if(!lpBmpData) { hDib = GlobalAlloc(GHND,dwNewBmpSize); if(!hDib) { DeleteObject(hBitmap); DeleteDC(hScrDC); DeleteDC(hMemDC); dwBmpSize=0; dwBmpInfoSize=0; return false; } } else { GlobalUnlock(lpBmpData); lpBmpData=(char*)GlobalFree(lpBmpData); hDib = GlobalAlloc(GHND,dwNewBmpSize); if(!hDib) { DeleteObject(hBitmap); DeleteDC(hScrDC); DeleteDC(hMemDC); dwBmpSize=0; dwBmpInfoSize=0; return false; } } lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); *lpbi = bi; } else//位图相关信息没有变化 { lpbi = (LPBITMAPINFOHEADER)lpBmpData; *lpbi = bi; } // 处理调色板 hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE); if (hPal) { hDC = GetDC (NULL); hOldPal = SelectPalette(hDC, hPal, FALSE); RealizePalette(hDC); } // 获取该调色板下新的像素值 GetDIBits( hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER) + dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS ); //恢复调色板 if (hOldPal) { SelectPalette(hScrDC, hOldPal, TRUE); RealizePalette(hScrDC); ReleaseDC(NULL, hDC); } lpBmpData = (char *)lpbi; dwBmpSize = dwNewBmpSize; //清除 DeleteObject (hBitmap); DeleteDC(hScrDC); DeleteDC(hMemDC); return TRUE; }