如何在MFC中使用一个自定义的ID来加载位图资源



//定义

CComQIPtr<IPicture>m_spIPicture;



//加载ID资源函数实现


HINSTANCE hInst = AfxGetResourceHandle();

HRSRC hRsrc = ::FindResource(hInst,

      MAKEINTRESOURCE(nIDRes),

      _T("IMAGE"));//在这里自定义了一个资源类型,名字是IMAGE

if(hRsrc == 0)

{

	   hRsrc = ::FindResource(hInst = AfxGetInstanceHandle() , 

                 MAKEINTRESOURCE(nIDRes) ,

                 _T("IMAGE")) ;

}

if (!hRsrc)

      return FALSE;


DWORD len = SizeofResource(hInst, hRsrc);

   HGLOBAL hGl = LoadResource(hInst, hRsrc);

   BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);


if (!lpRsrc)

      return FALSE;


CMemFile file(lpRsrc, len);

CArchive ar(&file, CArchive::load | CArchive::bNoFlushOnDelete);

CArchiveStream arcstream(&ar);

if(m_spIPicture)

       m_spIPicture.Release();

HRESULT hr = OleLoadPicture(pstm, 0, FALSE,

      IID_IPicture, (void**)&m_spIPicture);

   FreeResource(hRsrc);

到OleLoadPicture()函数的时候就会出现错误,返回值hr是一个负数-2146827807,而m_spIPicture返回的地址是{0x00000000},求解.

5 个解决方案

#1

用GDI+，Gdiplus::Image::FromSteam

可以试试这个函数：
BOOL ImageFromIDResource(UINT nID, LPCTSTR sTR, Gdiplus::Image * &pImg)
{
HINSTANCE hInst = AfxGetResourceHandle();
HRSRC hRsrc = ::FindResource (hInst,MAKEINTRESOURCE(nID),sTR); // type
if (!hRsrc)
return FALSE;
// load resource into memory
DWORD len = SizeofResource(hInst, hRsrc);
BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);
if (!lpRsrc)
return FALSE;
// Allocate global memory on which to create stream
HGLOBAL m_hMem = GlobalAlloc(GMEM_FIXED, len);
BYTE* pmem = (BYTE*)GlobalLock(m_hMem);
memcpy(pmem,lpRsrc,len);
IStream* pstm;
CreateStreamOnHGlobal(m_hMem,FALSE,&pstm);
// load from stream
pImg=Gdiplus::Image::FromStream(pstm);
// free/release stuff
GlobalUnlock(m_hMem);
pstm->Release();
FreeResource(lpRsrc);
return TRUE;
}

#2

那可不可以只传一个ID的参数,来实现图片的获取呢?
像这样



private:

   //定义

   CComQIPtr<IPicture>m_spIPicture;

.....

//类的实现

bool LoadFromID(UINT nID)

{

   .......

   //最后将m_spIPicture作为图片存储来使用

}

#3

有没有人知道啊?

#4

自己顶起~~~~

#5

study one down.

#1

#2