如何使用MFC加载.png,.jpeg图像？

Question

嗨我想加载png图像和jpeg图像.

谁能帮我？

Answer 1

CImage image;
image.Load(_T("C:\\image.png")); // just change extension to load jpg
CBitmap bitmap;
bitmap.Attach(image.Detach());

Answer 2

//----- load png into CImage from resource
bool Load( CImage * pimage, LPCTSTR lpszResourceName, HINSTANCE hinstRes)
{
    if (hinstRes == NULL)
    {
        hinstRes = AfxFindResourceHandle(lpszResourceName, _T("PNG") );
    }

    HRSRC hRsrc = ::FindResource(hinstRes, lpszResourceName, _T("PNG") );
    if (hRsrc == NULL)
    {
        return false;
    }

    HGLOBAL hGlobal = LoadResource(hinstRes, hRsrc);
    if (hGlobal == NULL)
    {
        return false;
    }

    LPBYTE lpBuffer = (LPBYTE) ::LockResource(hGlobal);
    if (lpBuffer == NULL)
    {
        FreeResource(hGlobal);
        return false;
    }

    bool bRes = false;
    {
        UINT uiSize = ::SizeofResource(hinstRes, hRsrc);

        HGLOBAL hRes = ::GlobalAlloc(GMEM_MOVEABLE, uiSize);
        if (hRes != NULL)
        {
            IStream* pStream = NULL;
            LPVOID lpResBuffer = ::GlobalLock(hRes);
            ASSERT (lpResBuffer != NULL);

            memcpy(lpResBuffer, lpBuffer, uiSize);

            HRESULT hResult = ::CreateStreamOnHGlobal(hRes, TRUE, &pStream);

            if( hResult == S_OK)
            {
                pimage->Load(pStream);
                pStream->Release();
                bRes= true;
            }
        }
    }

    UnlockResource(hGlobal);
    FreeResource(hGlobal);

    return bRes;
}

Answer 3

您可以使用支持以下格式的CImage类:JPEG,GIF,BMP和PNG.

http://msdn.microsoft.com/en-us/library/bwea7by5%28VS.80%29.aspx

使用加载功能从磁盘加载文件:

http://msdn.microsoft.com/en-us/library/tf4bytf8%28VS.80%29.aspx