对话框重绘失败

[qinqinhao]

在Onpaint中调用

CWnd *pWnd;
pWnd = GetDlgItem(IDC_Img);
ShowBitmap(pWnd);

然后再ShowBitmap中填充Img区域，再拷贝一个位图，但是位图重绘有问题。
另外，怎么得到对话框的hInstance来load位图，可以这么用吗？
hBmp=LoadBitmap(theApp.m_hInstance,"MyBitmap");


BOOL ShowBitmap::ShowBitmap(CWnd *pWnd)
{
HANDLE hBmp;
HDC hBitmapDC;
HDC hMemDC;
PAINTSTRUCT PtrStr;
int bitmapWidth=266;
int bitmapHeight=64;
HGDIOBJ prevObject;
HBRUSH fill;
HDC hdcRect;

CRect rect;

pWnd->GetClientRect(&rect);

hdcRect=::GetDC(pWnd->m_hWnd);
fill=CreateSolidBrush(0xFFFFFF); // Select white brush
prevObject=SelectObject(hdcRect,fill);
FillRect(hdcRect,&rect,fill); // Paint white rect
SelectObject(hdcRect,prevObject);
DeleteObject(fill);
::ReleaseDC(pWnd->m_hWnd,hdcRect);

hBmp=LoadBitmap(theApp.m_hInstance,"MyBitmap");
hBitmapDC=::BeginPaint(pWnd->m_hWnd,&PtrStr);
hMemDC=CreateCompatibleDC(hBitmapDC);
SelectObject(hMemDC,hBmp);

//Place Bitmap in center of paint area
BitBlt(hBitmapDC,
rect.left, // x
rect.top, // y
bitmapWidth, // width
bitmapHeight, // height
hMemDC,0,0,SRCCOPY);
DeleteDC(hMemDC);
::EndPaint(pWnd->m_hWnd,&PtrStr);

return true;
}

[疯石头]

帮顶。。。

[快乐鹦鹉]

LoadBitmap(::AfxGetInstanceHandle(),"MyBitmap");

[cnzdgs]

hBmp=LoadBitmap(theApp.m_hInstance,"MyBitmap");这样就可以，有什么问题？
用BeginPaint得到的DC，不需要再GetDC；重绘时要根据PAINTSTRUCT中的参数，不要一律重绘，也不需要每次都Load位图。