我想在程序的界面上显示一个URL指定的图片,在OnEraseBkgnd()里面加上了 char url[255]="D:\\VC2005\\2\\1.bmp";//此处更改URL//本地路径可以,网络路径有的不行,为什么? ShowPic(url,GetSafeHwnd());然后在CDIALOGDlg.cpp文件里加上如下代码:
HRESULT CDIALOGDlg::ShowPic(char *lpstrImgUrl,HWND hWnd)
{ HDC hDC_Temp=::GetDC(hWnd); IPicture *pPic;
IStream *pStm;
BOOL bResult;
DWORD dwFileSize,dwByteRead; //读取网页上图片文件,实际是个CHttpFile指针
CInternetSession session("HttpClient");
CFile* httpFile = (CFile*)session.OpenURL(lpstrImgUrl); if (httpFile!=INVALID_HANDLE_VALUE)
{
dwFileSize= httpFile->GetLength();//获取文件字节数
if (dwFileSize==0xFFFFFFFF)
return E_FAIL;
}
else
{
return E_FAIL;
} //分配全局存储空间
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
LPVOID pvData = NULL;
if (hGlobal == NULL)
return E_FAIL;
if ((pvData = GlobalLock(hGlobal)) == NULL)//锁定分配内存块
return E_FAIL; //把文件读入内存缓冲区
dwByteRead = httpFile->Read(pvData,dwFileSize);
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm); //装入图形文件
bResult=OleLoadPicture(pStm,dwFileSize,TRUE,IID_IPicture,(LPVOID*)&pPic);
if(FAILED(bResult))
return E_FAIL; OLE_XSIZE_HIMETRIC hmWidth; //图片的真实宽度, 单位为英寸
OLE_YSIZE_HIMETRIC hmHeight; //图片的真实高度, 单位为英寸
pPic->get_Width(&hmWidth);
pPic->get_Height(&hmHeight); //转换hmWidth和hmHeight为pixels距离,1英寸=25.4毫米
int nWidth = MulDiv(hmWidth,GetDeviceCaps(hDC_Temp,LOGPIXELSX),2540);
int nHeight = MulDiv(hmHeight,GetDeviceCaps(hDC_Temp,LOGPIXELSY),2540); //将图形输出到屏幕上(有点像BitBlt)
bResult=pPic->Render(hDC_Temp,0,0,nWidth,nHeight,
0,hmHeight,hmWidth,-hmHeight,NULL);
pPic->Release();
httpFile->Close();//关闭打开的文件
if (SUCCEEDED(bResult))
{
return S_OK;
}
else
{
return E_FAIL;
}
}结果显示的时候本地路径可以但是网络图片有的可以有的不行,为什么?有知道的请回复,有完美解决的更好,急求
HRESULT CDIALOGDlg::ShowPic(char *lpstrImgUrl,HWND hWnd)
{ HDC hDC_Temp=::GetDC(hWnd); IPicture *pPic;
IStream *pStm;
BOOL bResult;
DWORD dwFileSize,dwByteRead; //读取网页上图片文件,实际是个CHttpFile指针
CInternetSession session("HttpClient");
CFile* httpFile = (CFile*)session.OpenURL(lpstrImgUrl); if (httpFile!=INVALID_HANDLE_VALUE)
{
dwFileSize= httpFile->GetLength();//获取文件字节数
if (dwFileSize==0xFFFFFFFF)
return E_FAIL;
}
else
{
return E_FAIL;
} //分配全局存储空间
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
LPVOID pvData = NULL;
if (hGlobal == NULL)
return E_FAIL;
if ((pvData = GlobalLock(hGlobal)) == NULL)//锁定分配内存块
return E_FAIL; //把文件读入内存缓冲区
dwByteRead = httpFile->Read(pvData,dwFileSize);
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm); //装入图形文件
bResult=OleLoadPicture(pStm,dwFileSize,TRUE,IID_IPicture,(LPVOID*)&pPic);
if(FAILED(bResult))
return E_FAIL; OLE_XSIZE_HIMETRIC hmWidth; //图片的真实宽度, 单位为英寸
OLE_YSIZE_HIMETRIC hmHeight; //图片的真实高度, 单位为英寸
pPic->get_Width(&hmWidth);
pPic->get_Height(&hmHeight); //转换hmWidth和hmHeight为pixels距离,1英寸=25.4毫米
int nWidth = MulDiv(hmWidth,GetDeviceCaps(hDC_Temp,LOGPIXELSX),2540);
int nHeight = MulDiv(hmHeight,GetDeviceCaps(hDC_Temp,LOGPIXELSY),2540); //将图形输出到屏幕上(有点像BitBlt)
bResult=pPic->Render(hDC_Temp,0,0,nWidth,nHeight,
0,hmHeight,hmWidth,-hmHeight,NULL);
pPic->Release();
httpFile->Close();//关闭打开的文件
if (SUCCEEDED(bResult))
{
return S_OK;
}
else
{
return E_FAIL;
}
}结果显示的时候本地路径可以但是网络图片有的可以有的不行,为什么?有知道的请回复,有完美解决的更好,急求
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