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分享使用Directshow编写的拍照软件，在保存为bmp文件时，保存下来的文件是损坏的。各位大大能帮我看看我代码哪里有问题吗
不知道是文件那个信息数据设置有误，麻烦帮忙看下吧
上面是代码，m_pGB变量是定义的IGraphBuilder* m_pGB; //滤波器链表管理器
bool CCaptureVideo::CaptureBitmap1(const char* outfile)
{
CComQIPtr< IBasicVideo, &IID_IBasicVideo >pBasicVideo(m_pGB);
if (pBasicVideo)
{
long bitmapSize=0;
//首先获得图像大小
if(SUCCEEDED(pBasicVideo->GetCurrentImage(&bitmapSize,0)))
{
bool pass=false;
//分配图像帧内存
unsigned char*buffer=new unsigned char[bitmapSize];
//获取图像帧数据
if(SUCCEEDED(pBasicVideo->GetCurrentImage(&bitmapSize,(long*)buffer)))
{
BITMAPFILEHEADER hdr;
LPBITMAPINFOHEADER ipbi;
ipbi=(LPBITMAPINFOHEADER)buffer;
int nColors=1<<ipbi->biBitCount;
//if(nColors>256)
hdr.bfType = 'BM' ;
hdr.bfSize =bitmapSize+sizeof(hdr);
hdr.bfReserved1 =0;
hdr.bfReserved2 =0;
hdr.bfOffBits =(DWORD)
(sizeof(BITMAPFILEHEADER)+ipbi->biSize+nColors*sizeof(RGBQUAD));
HANDLE hf = CreateFile(LPCTSTR(outfile), GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, NULL);
DWORD dwWritten = 0;
WriteFile( hf, &hdr, sizeof( hdr ), &dwWritten, NULL );
dwWritten=0;
WriteFile( hf, &ipbi, sizeof( ipbi ), &dwWritten, NULL );
dwWritten=0;
WriteFile(hf, buffer, bitmapSize, &dwWritten, NULL );
CloseHandle( hf );
pass=true;
}
//delete[]burfer;
return pass;
}
}
}上面是代码，m_pGB变量是定义的IGraphBuilder* m_pGB; //滤波器链表管理器
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zhou45214284 2015-03-20
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这个方法我试过的，如果是preview模式可以使用，但是现在平板上要用overlay模式，有问题所以我改用的directshow。
xjq2003 2015-03-20
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#include <vfw.h>
HWND hWndC,ghWndCap;
void __fastcall TfmGoodsPhotoGet::sbCheckVideoClick(TObject *Sender)
{
bool bVFWFlag;
int iVFWCount;
if(!bCheckVideoEnable)
{//探杆打开
hWndC = Panel8->Handle;
//创建捕获窗,其中hWnd为主窗口句柄
ghWndCap = capCreateCaptureWindow("Capture Window",WS_CHILD|WS_VISIBLE,
0,0,352,298,hWndC,0);
bVFWFlag = false;
iVFWCount = 0;
while((iVFWCount<1000)&&(bVFWFlag==false))
{
bVFWFlag = capDriverConnect(ghWndCap,0);
iVFWCount++;
}
if(bVFWFlag==true)
{
CAPDRIVERCAPS caps;
capDriverGetCaps(ghWndCap,sizeof(caps),&caps);
if(caps.fHasOverlay) capOverlay(ghWndCap,TRUE);
capPreviewScale(ghWndCap,1);
capPreviewRate(ghWndCap,1000/24); // 设置Preview模式的显示速率
capPreview(ghWndCap,TRUE); //启动Preview模式
bCheckVideoEnable = true;
sbCheckVideo->Caption = "关闭探杆";
sbCapture->Enabled = true;
}
}
else
{//探杆关闭
if(ghWndCap)
{
capPreview(ghWndCap,false);
capCaptureStop(ghWndCap);
capCaptureAbort(ghWndCap);
capDriverDisconnect(ghWndCap);
::DestroyWindow(ghWndCap);
ghWndCap=NULL;
bCheckVideoEnable = false;
sbCheckVideo->Caption = "打开探杆";
sbCapture->Enabled = false;
}
}
}
//---------------------------------------------------------------------------
void __fastcall TfmGoodsPhotoGet::sbCaptureClick(TObject *Sender)
{
TJPEGImage *j=new TJPEGImage;
Graphics::TBitmap *b=new Graphics::TBitmap;
AnsiString asSaveFile;
if(!bCheckVideoEnable)
{
lbOpInfo->Caption = "探杆未打开";
return;
}
if(ghWndCap)
{
int i;
i=0;
try
{
asSaveFile = fmMain->asPhotoDir + "\\photo.bmp";
capFileSaveDIB(ghWndCap,asSaveFile.c_str());
i=1;
b->LoadFromFile(asSaveFile);
i=2;
j->Assign(b);
j->CompressionQuality=100; //等级太高有可能压缩出错！
j->Compress();
i=3;
ms_Temp->Position = 0;
j->SaveToStream(ms_Temp);
i=4;
ms_Temp->Position = 0;
jpgTemp->LoadFromStream(ms_Temp);
i=5;
imgComm->Picture->Assign(jpgTemp);
i=6;
lbOpInfo->Caption = "";
}
catch(...)
{
lbOpInfo->Caption = "抓拍失败！"+ AnsiString(i);
}
}
else
{
lbOpInfo->Caption = "探杆未打开";
}
delete b;
delete j;
}
//---------------------------------------------------------------------------
