如何在用mediaplayer控件做的播放器中抓图? 如题,请大侠援手!!! 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 要实现一下的class public IAVIFile,public IAVIStream,public IGetFrame,public IAVIStreaming具体自己看sdk吧。 提供两个函数CopyScreenToBitmap()拷贝指定的屏幕区域。SaveBitmapToFile()将图片保存至文件。你可以将要抓的区域拷屏下来。HBITMAP 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); // 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;}int SaveBitmapToFile(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; //位图属性结构 BITMAPFILEHEADER bmfHdr; //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 <= 32) wBitCount = 24; //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 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 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; // 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)lpbi, dwDIBSize, &dwWritten, NULL); //清除 GlobalUnlock(hDib); GlobalFree(hDib); CloseHandle(fh); return TRUE;} m_Player 未 mediaplayer控件叔祖int CTestPlayDlg::SaveImage(int index ){ if(m_Player[index].GetCurrentState() <= 0) //not ready return -1; HRESULT hresult; LPUNKNOWN pUnk;// pUnk = m_Player[index].GetControlUnknown(); pUnk = m_Player[index].GetFilterGraph(); if(!pUnk) return -1; CComQIPtr<IBasicVideo,&IID_IBasicVideo> pCPC(pUnk); if (!pCPC) return -1; pUnk->Release(); long size; BYTE *buffer; hresult = pCPC->GetCurrentImage(&size,NULL); if(hresult) return -2; buffer = new BYTE[size]; hresult = pCPC->GetCurrentImage(&size,(long*)buffer); if(hresult) return -3;// format filename and save it; CTime t = CTime::GetCurrentTime(); CString str = t.Format("%H%M%S"); CString filename; m_Player[index].SetDisplayMode(1); int pos = (int)m_Player[index].GetCurrentPosition(); filename.Format("%s_%d_%d.bmp",str,index,pos); CFile file; BITMAPFILEHEADER bmHeader; memset(&bmHeader,0,sizeof(bmHeader)); bmHeader.bfType = 0X4D42; bmHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+40; file.Open(filename,CFile::modeCreate|CFile::modeWrite); file.Write(&bmHeader,sizeof(bmHeader)); file.Write(buffer,size); file.Close(); delete buffer; return 0;} //首先取得 IGraphBuild 接口指针 pUnk = m_Player[index].GetFilterGraph(); if(!pUnk) return -1;//然后取得 IBasicVideo 接口指针 CComQIPtr<IBasicVideo,&IID_IBasicVideo> pCPC(pUnk); if (!pCPC) return -1; pUnk->Release(); long size; BYTE *buffer;//调用 IBasicVideo 的 GetCurrentImage 方法 hresult = pCPC->GetCurrentImage(&size,NULL); 双缓冲贴图的问题 单文档中ondraw()和onCreate()运行问题 一般情况,插件是否需要访问主程序,如果需要,怎么做才能安全 请问:除了在mfc中可以用ado方式访问数据库外,还可不可以在vc的sdk中以ado方式访问sql数据库? 问几个windows登录的问题:1. 如何取得当前登录到windows的用户名? FTP使用? 在线等 我问一个问题,大家帮忙. 如何在建立一个tab control~ 用api建~ 为什么GetDocument不能用在视图类的构造函数里? 前途??? mci的使用! 将文件目录路径中的 "/" 换成 "//",怎么换最快,谁给我一个函数..
public IAVIFile,
public IAVIStream,
public IGetFrame,
public IAVIStreaming具体自己看sdk吧。
{
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);
// 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;
}int SaveBitmapToFile(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;
//位图属性结构
BITMAPFILEHEADER bmfHdr;
//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 <= 32)
wBitCount = 24;
//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
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
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;
// 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)lpbi, dwDIBSize,
&dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
int CTestPlayDlg::SaveImage(int index )
{
if(m_Player[index].GetCurrentState() <= 0) //not ready
return -1;
HRESULT hresult;
LPUNKNOWN pUnk;
// pUnk = m_Player[index].GetControlUnknown();
pUnk = m_Player[index].GetFilterGraph();
if(!pUnk)
return -1;
CComQIPtr<IBasicVideo,&IID_IBasicVideo> pCPC(pUnk);
if (!pCPC)
return -1;
pUnk->Release(); long size;
BYTE *buffer;
hresult = pCPC->GetCurrentImage(&size,NULL);
if(hresult)
return -2;
buffer = new BYTE[size];
hresult = pCPC->GetCurrentImage(&size,(long*)buffer);
if(hresult)
return -3;
// format filename and save it;
CTime t = CTime::GetCurrentTime();
CString str = t.Format("%H%M%S");
CString filename;
m_Player[index].SetDisplayMode(1);
int pos = (int)m_Player[index].GetCurrentPosition();
filename.Format("%s_%d_%d.bmp",str,index,pos);
CFile file;
BITMAPFILEHEADER bmHeader;
memset(&bmHeader,0,sizeof(bmHeader));
bmHeader.bfType = 0X4D42;
bmHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+40;
file.Open(filename,CFile::modeCreate|CFile::modeWrite);
file.Write(&bmHeader,sizeof(bmHeader));
file.Write(buffer,size);
file.Close();
delete buffer;
return 0;
}
pUnk = m_Player[index].GetFilterGraph();
if(!pUnk)
return -1;//然后取得 IBasicVideo 接口指针 CComQIPtr<IBasicVideo,&IID_IBasicVideo> pCPC(pUnk);
if (!pCPC)
return -1;
pUnk->Release(); long size;
BYTE *buffer;
//调用 IBasicVideo 的 GetCurrentImage 方法
hresult = pCPC->GetCurrentImage(&size,NULL);