冰雨小記

LPPICTURE gpPicture;
void C169Dlg::ShowPicture(CDC *pDC, CString m_strBRoute, int x, int y, int width, int height)
{
HANDLE hFile =CreateFile(m_strBRoute, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
_ASSERTE(INVALID_HANDLE_VALUE != hFile);

//Get File Size
DWORD dwFileSize = GetFileSize(hFile, NULL);
_ASSERTE(-1 != dwFileSize);
LPVOID pvData = NULL;

//Allocate Memory
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
_ASSERTE(NULL != hGlobal);
pvData = GlobalLock(hGlobal);
_ASSERTE(NULL != pvData);
DWORD dwBytesRead = 0;

//Read File
BOOL bRead = ReadFile(hFile, pvData, dwFileSize, &dwBytesRead, NULL);
_ASSERTE(FALSE != bRead);
GlobalUnlock(hGlobal);
CloseHandle(hFile);
LPSTREAM pstm = NULL;

HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);
_ASSERTE(SUCCEEDED(hr) && pstm);

if(gpPicture)
gpPicture->Release();

hr = OleLoadPicture(pstm, dwFileSize, FALSE, IID_IPicture, (LPVOID *)&gpPicture);
_ASSERTE(SUCCEEDED(hr) && gpPicture);
pstm->Release();
HDC hdc;
hdc=pDC->GetSafeHdc();
if(gpPicture)
{
long hmWidth;
long hmHeight;
gpPicture->get_Width(&hmWidth);
gpPicture->get_Height(&hmHeight);

int nWidth = MulDiv(hmWidth, GetDeviceCaps(hdc, LOGPIXELSX), 2540);
int nHeight = MulDiv(hmHeight, GetDeviceCaps(hdc, LOGPIXELSY), 2540);
RECT rc;
GetClientRect(&rc);
gpPicture->Render(hdc, x,y, (int)height*hmWidth/hmHeight, height, 0, hmHeight, hmWidth, -hmHeight, &rc);
}
}