打印位图，打不出来怎么办？

[feng1976]

最好给段代码

[qwedcxza]

绘制代码写在 OnDraw 中

[bluebohe]

void Draw(HDC hDC,HBITMAP hBmp,double dScaleX,double dScaleY,int iX,int iY,int iWidth=0,int iLength=0)
{
HPALETTE hPal;
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hDIB;
HANDLE handle;
HDC hDC1;
if(GetDeviceCaps(hDC,RASTERCAPS) & RC_PALETTE )
{
UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * 256);
LOGPALETTE *pLP = (LOGPALETTE *) new BYTE[nSize];
pLP->palVersion = 0x300;
pLP->palNumEntries =GetSystemPaletteEntries( hDC, 0, 255, pLP->palPalEntry );
hPal=CreatePalette(pLP );
delete[] pLP;
}
if (hPal==NULL) hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
::GetObject(hBmp,sizeof(bm),(LPSTR)&bm);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = bm.bmPlanes * bm.bmBitsPixel;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
int nColors = (1 << bi.biBitCount);
if( nColors > 256 )
nColors = 0;
dwLen = bi.biSize + nColors * sizeof(RGBQUAD);
hDC1 = ::GetDC(NULL);
hPal = SelectPalette(hDC1,hPal,FALSE);
RealizePalette(hDC1);
hDIB = GlobalAlloc(GMEM_FIXED,dwLen);
if (!hDIB)
{
SelectPalette(hDC1,hPal,FALSE);
::ReleaseDC(NULL,hDC1);
DeleteObject(hPal);
return ;
}
lpbi = (LPBITMAPINFOHEADER)hDIB;
*lpbi = bi;
::GetDIBits(hDC1, hBmp, 0L, (DWORD)bi.biHeight,
(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);
bi = *lpbi;
if (bi.biSizeImage == 0)
bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)* bi.biHeight;
dwLen += bi.biSizeImage;
if (handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE))
hDIB = handle;
else
{
GlobalFree(hDIB);
SelectPalette(hDC1,hPal,FALSE);
::ReleaseDC(NULL,hDC1);
DeleteObject(hPal);
return ;
}
lpbi = (LPBITMAPINFOHEADER)hDIB;
BOOL bGotBits = GetDIBits( hDC1, hBmp,0L,(DWORD)bi.biHeight,(LPBYTE)lpbi+ (bi.biSize + nColors * sizeof(RGBQUAD)),
(LPBITMAPINFO)lpbi,(DWORD)DIB_RGB_COLORS);
if( !bGotBits )
{
GlobalFree(hDIB);
SelectPalette(hDC1,hPal,FALSE);
::ReleaseDC(NULL,hDC1);
DeleteObject(hPal);
return;
}
if(iWidth==0||iLength==0)
{
iWidth=lpbi->biWidth;
iLength=lpbi->biHeight;
iWidth=(int)(dScaleX*iWidth);
iLength=(int)(iLength*dScaleY);
}
StretchDIBits(hDC,iX,iY,iWidth,iLength,0,0,lpbi->biWidth,lpbi->biHeight,(LPBYTE)lpbi // address for bitmap bits
+ (bi.biSize + nColors * sizeof(RGBQUAD)),(LPBITMAPINFO)lpbi,DIB_RGB_COLORS,SRCCOPY);
SelectPalette(hDC1,hPal,FALSE);
::ReleaseDC(NULL,hDC1);
DeleteObject(hDIB);
DeleteObject(hPal);
}