位图不能显示~~5.5

Question

bool opfile(char* ofn)
{
BITMAPFILEHEADER bithead_file=*new BITMAPFILEHEADER;
BITMAPINFOHEADER bithead_info=*new BITMAPINFOHEADER;
BITMAPINFO  bit_info=*new BITMAPINFO;
RGBQUAD rgb=*new RGBQUAD;
LPBITMAPINFO* bitinfo; SECURITY_ATTRIBUTES *sa=new SECURITY_ATTRIBUTES;
DWORD headsize,size_file,size_info,size_rgb,size_data,*wd=new DWORD; headsize=(DWORD)sizeof(bithead_file); HANDLE hFile=new HANDLE; hFile= CreateFile(ofn, GENERIC_READ,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, NULL); if (hFile==INVALID_HANDLE_VALUE)   
{
MessageBox(NULL,"e","e",MB_OK);
} SetFilePointer(hFile,0,0,FILE_BEGIN);

if(!ReadFile(hFile,&bithead_file,sizeof(BITMAPFILEHEADER),&size_file,NULL)) MessageBox(NULL,"error","e",MB_OK);
if(bithead_file.bfType!=0x4d42)
{
MessageBox(NULL,"not bmp","error",MB_OK);
return 0;
}
if(!ReadFile(hFile,&bithead_info,sizeof(BITMAPINFOHEADER),&size_info,NULL)) MessageBox(NULL,"error","e",MB_OK);
if(!ReadFile(hFile,&bit_info,sizeof(BITMAPINFO),&size_info,NULL)) MessageBox(NULL,"error","e",MB_OK);
//if(!ReadFile(hFile,&rgb,sizeof(RGBQUAD),&size_rgb,NULL)) MessageBox(NULL,"error","e",MB_OK); DWORD size=bithead_file.bfSize-sizeof(BITMAPFILEHEADER)-sizeof(BITMAPINFOHEADER); SetFilePointer(hFile,(long)bithead_file.bfOffBits,0,FILE_BEGIN); DWORD bitcount;
LONG bitwidth,bitheight,datasize;
bitcount=bithead_info.biBitCount;
bitwidth=bithead_info.biWidth;
bitheight=bithead_info.biHeight; datasize=bitheight*WIDTHBYTES(bithead_info.biBitCount); HANDLE temp=(HANDLE)::GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT,size);
LPSTR ptr=(LPSTR)temp; if(!ReadFile(hFile,ptr,datasize,&size_info,NULL)) MessageBox(NULL,"error","e",MB_OK); HBITMAP bitmap=*new HBITMAP;
HDC dc=GetDC(hWnd),MemDC=CreateCompatibleDC(dc); const BITMAPINFOHEADER* ptr_headinfo=&bithead_info;
const BITMAPINFO* ptr_info=&bit_info;
UINT uStartScan; HANDLE hdib=(HANDLE)GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT,bithead_file.bfSize); HBITMAP hBit;
  //SetDIBitsToDevice(MemDC,0,0,bithead_info.biWidth,bithead_info.biHeight,0,0,uStartScan,bithead_info.biHeight,ptr,ptr_info,DIB_RGB_COLORS);
hBit=CreateDIBitmap(MemDC,ptr_headinfo,CBM_INIT,ptr,ptr_info,DIB_RGB_COLORS);
if(hBit=0) MessageBox(NULL,"CreateDIBitmap出错","e",MB_OK);
//SelectObject(MemDC,hBit);
BitBlt(dc,0,0,bithead_info.biWidth,bithead_info.biHeight,MemDC,0,0,SRCCOPY); delete(sa);
//delete(&bithead_file);
//delete(bithead_info); return 1;
}bithead_info,bit_info已经正确指向结构``最后bittle后为什么没有图片显示??

Answer 1

CBitmap m_bitmap;m_bitmap.LoadBitmap(MapId);
CDC dcImage;
if (!dcImage.CreateCompatibleDC(&dc))
return;

BITMAP bm;
m_bitmap.GetBitmap(&bm);

CBitmap* pOldBitmap = dcImage.SelectObject(&m_bitmap);
//dc.BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &dcImage, 0, 0, SRCCOPY);
dc.SetStretchBltMode(STRETCH_HALFTONE|STRETCH_ORSCANS);
dc.StretchBlt(0,0,WinRect.right,WinRect.bottom - 80,&dcImage,0,0,
bm.bmWidth, bm.bmHeight,SRCCOPY); dcImage.SelectObject(pOldBitmap);
dcImage.DeleteDC();

Answer 2

//显示图片函数
BOOL ShowPIC(CDC *pDC, CString strPath, CRect rect,int ShowType)
{
CPen newpen(PS_DOT,1,RGB(255,255,255));
CPen *pOldPen=pDC->SelectObject(&newpen);
pDC->Rectangle(rect);
pDC->SelectObject(pOldPen);

//显示BMP JPG GIF等格式的图片
    IStream *pStm;  
    CFileStatus fstatus;
    CFile file;  
    LONG cb;  

HGLOBAL hGlobal;
    //打开文件并检测文件的有效性
    if (file.Open(strPath,CFile::modeRead)&&
        file.GetStatus(strPath,fstatus)&& 
        ((cb = fstatus.m_size) != -1)) 
    {  

        hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb); 
        LPVOID pvData = NULL;  
        if (hGlobal != NULL)  
        {  
            pvData = GlobalLock(hGlobal);
            if (pvData != NULL)  
            {  
                file.ReadHuge(pvData, cb);  
                GlobalUnlock(hGlobal);  
                CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);  
            } 
        } 
    }
    else
    {
        return false;
    } 
//打开文件结束
    

    //显示JPEG和GIF格式的图片，GIF只能显示一帧，还不能显示动画，
//要显示动画GIF请使用ACTIVE控//件。

    IPicture *pPic; 
    //load image from file stream

    if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic))) 
    { 
        OLE_XSIZE_HIMETRIC hmWidth;  
        OLE_YSIZE_HIMETRIC hmHeight; 
        pPic->get_Width(&hmWidth);  
        pPic->get_Height(&hmHeight);
        double fX,fY;  
        //得到图片的高度与宽度
        fX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/
((double)pDC->GetDeviceCaps(HORZSIZE)*100.0);  
        fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/
((double)pDC->GetDeviceCaps(VERTSIZE)*100.0);  

long nwidth,nheight,nleft,ntop;
int Rx,Ry;
Rx=rect.Width();
Ry=rect.Height();
nheight=Ry;
nwidth=Rx;
nleft=rect.left;
ntop=rect.top;
//检测显示模式
//是否拉伸充满区域显示
if(ShowType==1)
{
nheight=Ry;
nwidth=Rx;
nleft=rect.left;
ntop=rect.top;
}
//是否居中且按正常比例显示
else if(ShowType==2)
{
if(fX<Rx) nwidth=(long)fX;
if(fY<Ry)     nheight=(long)fY;

if((fY>Ry)||(fX>Rx))
{
double temp,temp2;
temp=Ry/fY;
temp2=Rx/fX;
if(temp<temp2)
{
nwidth=(long)(fX*temp);
nleft=(Rx-nwidth)/2+rect.left;
}
else if(temp>=temp2)
{
nheight=(long)(fY*temp2);
ntop=(Ry-nheight)/2+rect.top;
}
}
}


        //用 Render函数显示图片
        //if(FAILED(pPic->Render(*pDC,rect.left,rect.top ,rect.Width(),rect.Height(),0,
if(FAILED(pPic->Render(*pDC,nleft,ntop,nwidth,nheight,0,
hmHeight,hmWidth,-hmHeight,NULL)))  
        {
            pPic->Release();
            return false;
        }
           pPic->Release();  
    }  

    else  
    {
        return false;  
    }
//释放内存
    GlobalUnlock(hGlobal);  
GlobalFree(hGlobal);      return true;}

Answer 3

希望别拿例子上的MFC过来`只希望达人能给我一些指点`，了解我的代码里到底有什么错误`~

Answer 4

HANDLE hFile=new HANDLE;        // 内存泄露！！ 直接HANDLE hFile;即可
HBITMAP bitmap=*new HBITMAP;   // 内存泄露！！ 多余
//SelectObject(MemDC,hBit);     // 必须选入！！
ptr,ptr_info                    // 最好为整块内存里面的两个地址！！Bitblt 应该放在OnDraw() 或OnPaint() 事件内 
否则一刷新你就看不见