请教下如何屏幕监控如何传图像? 我想请教下有没有简单、容易实现一点的方法?直接用SetBitmapBits和GetBitmapBits传搜的数据太大了~效果不好~如果将32位转16位的话有没有简单一点实现的方法?或者有更好的办法?bmp没仔细研究~ 求救~~! 程序快要完工了~ 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 很简单,保存为jpg,再压缩,传输,解压,还原为bmp,即可。 考虑压缩后再传输,否则,每帧都是bmp未压缩的文件的话,数据量太大了 图像数据肯定是要压缩的 转换为JPG再压缩你会发现压缩率是相当杯具的,传屏的重点不在压缩,而在于如何快速获得屏幕变化的区域,也就是所谓的差异截图了,每次都发整个屏幕的图像是完全不可行的方案 //拷贝屏幕并保存为zlib压缩文件void CCopyScreenToBitmapDlg::OnCopyscreenCompress() { //2> 全屏截图 DWORD dwStart = GetTickCount(); CRect rect; rect.left = 0; rect.top = 0; rect.right = GetSystemMetrics(SM_CXSCREEN); rect.bottom = GetSystemMetrics(SM_CYSCREEN); HBITMAP hMap = CopyScreenToBitmap(rect); DWORD dwEnd = GetTickCount(); DWORD dwSpend = dwEnd - dwStart; TRACE("\nTIME SPEND:%d",dwSpend); SaveCompressBitmapToFile(hMap,"C:\\seu07201213(汪洋中的一片叶子).RAZ");}//函数1: CopyScreenToBitmap //将屏幕指定区域存成图片HBITMAP CCopyScreenToBitmapDlg::CopyScreenToBitmap(LPRECT lpRect) //lpRect 代表选定区域{ 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 // 确保选定区域不为空矩形 if (IsRectEmpty(lpRect)) return NULL; //为屏幕创建设备描述表 hScrDC = CreateDC("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); // 获得选定区域坐标 nX = lpRect->left; nY = lpRect->top; nX2 = lpRect->right; nY2 = lpRect->bottom; // 获得屏幕分辨率 xScrn = GetDeviceCaps(hScrDC, HORZRES); yScrn = GetDeviceCaps(hScrDC, VERTRES); //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; // 创建一个与屏幕设备描述表兼容的位图 hBitmap=CreateCompatibleBitmap(hScrDC,nWidth,nHeight); DWORD err = GetLastError(); // 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); //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;}//函数2 : SaveBitmapToFile 将图片压缩并存成文件int CCopyScreenToBitmapDlg::SaveCompressBitmapToFile(HBITMAP hBitmap, LPSTR lpFileName) //hBitmap 为刚才的屏幕位图句柄{ //lpFileName 为位图文件名 HDC hDC; //设备描述表 int iBits; //当前显示分辨率下每个像素所占字节数 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,dwDIBSize, dwWritten; BITMAP Bitmap; //位图文件头结构 BITMAPINFOHEADER bi; //位图信息头结构 LPBITMAPINFOHEADER lpbi; //指向位图信息头结构 HANDLE fh, hDib, hPal; HPALETTE hOldPal=NULL; //定义文件,分配内存句柄,调色板句柄 //计算位图文件每个像素所占字节数 hDC = CreateDC("DISPLAY",NULL,NULL,NULL); iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES); DeleteDC(hDC); if (iBits <= 1) wBitCount = 1; else if (iBits <= 4) wBitCount = 4; else if (iBits <= 8) wBitCount = 8; else if (iBits <= 24) wBitCount = 24; else wBitCount = 32; //计算调色板大小 if (wBitCount <= 8) 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)/32)*4*Bitmap.bmHeight; //为位图内容分配内存 /*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx //每个扫描行所占的字节数应该为4的整数倍,具体算法为: int biWidth = (Bitmap.bmWidth*wBitCount) / 32; if((Bitmap.bmWidth*wBitCount) % 32) biWidth++; //不是整数倍的加1 biWidth *= 4;//到这里,计算得到的为每个扫描行的字节数。 dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/ hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER)); lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); *lpbi = bi; // 处理调色板 hPal = GetStockObject(DEFAULT_PALETTE); if (hPal) { hDC = ::GetDC(NULL); hOldPal=SelectPalette(hDC,(HPALETTE)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(hDC, hOldPal, TRUE); RealizePalette(hDC); ::ReleaseDC(NULL, hDC); } //创建位图文件 fh=CreateFile(lpFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL); if (fh==INVALID_HANDLE_VALUE) return FALSE; // 设置位图文件头 //位图属性结构 BITMAPFILEHEADER bmfHdr; bmfHdr.bfType = 0x4D42; // "BM" dwDIBSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize; bmfHdr.bfSize = dwDIBSize; bmfHdr.bfReserved1 = 0; bmfHdr.bfReserved2 = 0; bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize; UINT nBmpBody = sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize; uLong compressedSize = compressBound (nBmpBody); DWORD dwStart = GetTickCount(); byte *pBuffer = new byte[compressedSize]; if( Z_OK!=::compress((Bytef *)pBuffer,&compressedSize,(Bytef *)lpbi,nBmpBody) ) {// file.Close(); GlobalUnlock(hDib); GlobalFree(hDib); CloseHandle(fh); AfxMessageBox("压缩失败!"); return 0; } DWORD dwEnd = GetTickCount(); DWORD dwSpend = dwEnd - dwStart; TRACE("\nTIME SPEND:%d",dwSpend); // 写入位图文件头 WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL); // 写入位图文件其余内容 WriteFile(fh, (LPSTR)pBuffer, compressedSize , &dwWritten, NULL); //清除 delete []pBuffer; GlobalUnlock(hDib); GlobalFree(hDib); CloseHandle(fh); return TRUE;}//解压缩文件void CCopyScreenToBitmapDlg::OnDecompress() { CString strCompressed("C:\\seu07201213(汪洋中的一片叶子).RAZ"); CFile file; if( !file.Open(strCompressed,CFile::modeRead) ) { AfxMessageBox("打开文件错误!"); return; } uLong fileSize = file.GetLength(); byte *pFileBuff = new byte[fileSize]; BITMAPFILEHEADER bmfHdr; file.Read(&bmfHdr,sizeof(BITMAPFILEHEADER)); int nUnCompress = fileSize - sizeof(BITMAPFILEHEADER); file.Read(pFileBuff,nUnCompress); int unCompressFileSize = nUnCompress*100; byte *pUnComressBuff = new byte[unCompressFileSize]; memset(pUnComressBuff,'\0',unCompressFileSize); uLong unCompress = unCompressFileSize; DWORD dwStart = GetTickCount(); int res = ::uncompress((Bytef *)pUnComressBuff,&unCompress,(Bytef *)pFileBuff,nUnCompress); if( res==Z_BUF_ERROR ) { delete []pFileBuff; delete []pUnComressBuff; file.Close(); AfxMessageBox("缓冲区大小不足!"); return; } DWORD dwEnd = GetTickCount(); DWORD dwSpend = dwEnd - dwStart; TRACE("\nTIME SPEND:%d",dwSpend); file.Close(); if( unCompress==0 ) { delete []pFileBuff; delete []pUnComressBuff; AfxMessageBox("解压缩文件失败!"); return; } CString strNormal("C:\\abc.bmp"); if( !file.Open(strNormal,CFile::modeCreate | CFile::modeWrite) ) { delete []pFileBuff; delete []pUnComressBuff; AfxMessageBox("解压缩文件失败!"); return; } file.Write(&bmfHdr,sizeof(BITMAPFILEHEADER)); file.Write(pUnComressBuff,unCompress); file.Close(); delete []pFileBuff; delete []pUnComressBuff; AfxMessageBox("解压缩成功!");} MFC 消息处理的一个小问题??? 关于OnCustomDraw的问题 olelink错误,高分求救! 如何在控件里使用已有控件? 一个关于字体设置的小问题 windows系统自带的DLL和visual studio.net(version 2002)自带的DLL有什么不同啊 有没有《vc6.0编程实例》教程下载 这是怎么搞的,抖动的好厉害!! 请教一个对话框自身类的指针的问题?? 怎样才能学好VC++ 请教各路高手关于截屏JPG图片在读取、发送和显示的问题,先谢谢大家 请问VC的IDE中的函数名不能自动完成吗?(VS2005)
//拷贝屏幕并保存为zlib压缩文件
void CCopyScreenToBitmapDlg::OnCopyscreenCompress()
{
//2> 全屏截图
DWORD dwStart = GetTickCount();
CRect rect;
rect.left = 0;
rect.top = 0;
rect.right = GetSystemMetrics(SM_CXSCREEN);
rect.bottom = GetSystemMetrics(SM_CYSCREEN);
HBITMAP hMap = CopyScreenToBitmap(rect);
DWORD dwEnd = GetTickCount();
DWORD dwSpend = dwEnd - dwStart;
TRACE("\nTIME SPEND:%d",dwSpend);
SaveCompressBitmapToFile(hMap,"C:\\seu07201213(汪洋中的一片叶子).RAZ");
}//函数1: CopyScreenToBitmap //将屏幕指定区域存成图片
HBITMAP CCopyScreenToBitmapDlg::CopyScreenToBitmap(LPRECT lpRect) //lpRect 代表选定区域
{
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
// 确保选定区域不为空矩形
if (IsRectEmpty(lpRect))
return NULL;
//为屏幕创建设备描述表
hScrDC = CreateDC("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);
// 获得选定区域坐标
nX = lpRect->left;
nY = lpRect->top;
nX2 = lpRect->right;
nY2 = lpRect->bottom;
// 获得屏幕分辨率
xScrn = GetDeviceCaps(hScrDC, HORZRES);
yScrn = GetDeviceCaps(hScrDC, VERTRES);
//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;
// 创建一个与屏幕设备描述表兼容的位图
hBitmap=CreateCompatibleBitmap(hScrDC,nWidth,nHeight);
DWORD err = GetLastError();
// 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);
//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;
}//函数2 : SaveBitmapToFile 将图片压缩并存成文件
int CCopyScreenToBitmapDlg::SaveCompressBitmapToFile(HBITMAP hBitmap, LPSTR lpFileName) //hBitmap 为刚才的屏幕位图句柄
{ //lpFileName 为位图文件名
HDC hDC;
//设备描述表
int iBits;
//当前显示分辨率下每个像素所占字节数
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,dwDIBSize, dwWritten;
BITMAP Bitmap;
//位图文件头结构
BITMAPINFOHEADER bi;
//位图信息头结构
LPBITMAPINFOHEADER lpbi;
//指向位图信息头结构
HANDLE fh, hDib, hPal;
HPALETTE hOldPal=NULL;
//定义文件,分配内存句柄,调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 32;
//计算调色板大小
if (wBitCount <= 8)
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)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存
/*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx
//每个扫描行所占的字节数应该为4的整数倍,具体算法为:
int biWidth = (Bitmap.bmWidth*wBitCount) / 32;
if((Bitmap.bmWidth*wBitCount) % 32)
biWidth++; //不是整数倍的加1
biWidth *= 4;//到这里,计算得到的为每个扫描行的字节数。
dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal=SelectPalette(hDC,(HPALETTE)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(hDC, hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh=CreateFile(lpFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh==INVALID_HANDLE_VALUE)
return FALSE;
// 设置位图文件头
//位图属性结构
BITMAPFILEHEADER bmfHdr;
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize; UINT nBmpBody = sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;
uLong compressedSize = compressBound (nBmpBody);
DWORD dwStart = GetTickCount(); byte *pBuffer = new byte[compressedSize];
if( Z_OK!=::compress((Bytef *)pBuffer,&compressedSize,(Bytef *)lpbi,nBmpBody) )
{
// file.Close();
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
AfxMessageBox("压缩失败!");
return 0;
} DWORD dwEnd = GetTickCount();
DWORD dwSpend = dwEnd - dwStart;
TRACE("\nTIME SPEND:%d",dwSpend);
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)pBuffer, compressedSize , &dwWritten, NULL);
//清除
delete []pBuffer;
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}//解压缩文件
void CCopyScreenToBitmapDlg::OnDecompress()
{
CString strCompressed("C:\\seu07201213(汪洋中的一片叶子).RAZ");
CFile file;
if( !file.Open(strCompressed,CFile::modeRead) )
{
AfxMessageBox("打开文件错误!");
return;
}
uLong fileSize = file.GetLength();
byte *pFileBuff = new byte[fileSize]; BITMAPFILEHEADER bmfHdr;
file.Read(&bmfHdr,sizeof(BITMAPFILEHEADER)); int nUnCompress = fileSize - sizeof(BITMAPFILEHEADER);
file.Read(pFileBuff,nUnCompress);
int unCompressFileSize = nUnCompress*100;
byte *pUnComressBuff = new byte[unCompressFileSize];
memset(pUnComressBuff,'\0',unCompressFileSize);
uLong unCompress = unCompressFileSize; DWORD dwStart = GetTickCount(); int res = ::uncompress((Bytef *)pUnComressBuff,&unCompress,(Bytef *)pFileBuff,nUnCompress);
if( res==Z_BUF_ERROR )
{
delete []pFileBuff;
delete []pUnComressBuff;
file.Close();
AfxMessageBox("缓冲区大小不足!");
return;
} DWORD dwEnd = GetTickCount();
DWORD dwSpend = dwEnd - dwStart;
TRACE("\nTIME SPEND:%d",dwSpend); file.Close();
if( unCompress==0 )
{
delete []pFileBuff;
delete []pUnComressBuff;
AfxMessageBox("解压缩文件失败!");
return;
}
CString strNormal("C:\\abc.bmp");
if( !file.Open(strNormal,CFile::modeCreate | CFile::modeWrite) )
{
delete []pFileBuff;
delete []pUnComressBuff;
AfxMessageBox("解压缩文件失败!");
return;
}
file.Write(&bmfHdr,sizeof(BITMAPFILEHEADER));
file.Write(pUnComressBuff,unCompress);
file.Close();
delete []pFileBuff;
delete []pUnComressBuff; AfxMessageBox("解压缩成功!");
}