VC图像打印的问题，找了一天了，各位给看看解决了我有多少分给多少！

kikipu 2007-10-27 03:49:06

HBITMAP hBitmap=::LoadBitmap(AfxGetInstanceHandle(),(LPCTSTR)IDB_PAGEONE);
BITMAP bitmap;
::GetObject(hBitmap,sizeof(BITMAP),&bitmap);
double dScale=(double)m_cxWidth/bitmap.bmWidth;
int nScaledWidth=m_cxWidth;
int nScaledHeight=(int)(bitmap.bmHeight*dScale);

HDC dcMem;
dcMem=::CreateCompatibleDC(pDC->m_hDC);
HBITMAP hOldBmp=(HBITMAP)::SelectObject(dcMem,hBitmap);

int nVertCenterPos = pDC->GetDeviceCaps (VERTRES) / 2;
::StretchBlt(pDC->m_hDC,m_cxOffset/2,(4 + PRINTMARGIN)*m_cyPrinter /2,nScaledWidth+m_cxOffset,nScaledHeight+(4 + PRINTMARGIN)*m_cyPrinter,dcMem,0,0,bitmap.bmWidth,bitmap.bmHeight,SRCCOPY);
这个是图像显示的过程，用预览可以看到，但是只有一打印还是空白，而且图像有个最大值不能再大了。

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lllxy 2007-11-15

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接分

e_feeling 2007-11-12

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关注

kikipu 2007-11-06

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我咋不能加分呢？

kikipu 2007-11-06

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谢谢各位了！终于搞好了是内存绘图的问题！

HBITMAP hBitmap=(HBITMAP)LoadImage(0,_T(".\\config\\page1.bmp"),IMAGE_BITMAP,0,0,LR_LOADFROMFILE | LR_CREATEDIBSECTION);

		BITMAP bitmap;

		if (MemDC.GetSafeHdc() == NULL)

		{

			Bitmap.Attach(hBitmap);

			MemDC.CreateCompatibleDC(pDC);

			Bitmap.GetObject(sizeof(bitmap),&bitmap);

			pOldBmp=MemDC.SelectObject(&Bitmap);

			Source.top=0;

			Source.left=0;

			Source.right= bitmap.bmWidth;

			Source.bottom = bitmap.bmHeight;

			Dest = Source;

		}

		pDC->DPtoLP(&Dest);

	   	pDC->StretchBlt(Dest.left, Dest.top, Dest.right, Dest.bottom,&MemDC,Source.left, Source.top, Source.right,Source.bottom,SRCCOPY);

lyg_zy 2007-10-30

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参考mfc的打印流程和源代码修改你的打印代码吧。

凤矶 2007-10-29

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你确定StretchBlt时没有超出viewport范围？

	HANDLE hPrinter;

    char * const PrinterName = "hp 7900";

	

    if ( !OpenPrinter(PrinterName, &hPrinter, NULL) )

        return ;

    int nSize = DocumentProperties(NULL, hPrinter, PrinterName, NULL, NULL, 0);

    DEVMODE * pDevMode = (DEVMODE *) new char[nSize];

    if ( pDevMode==NULL )

        return ;

	

    // ask driver to initialize a devmode structure

    DocumentProperties(NULL, hPrinter, PrinterName, pDevMode, NULL, DM_OUT_BUFFER);

    pDevMode->dmPaperSize = DMPAPER_A4;

    pDevMode->dmOrientation = DMORIENT_LANDSCAPE;

    DocumentProperties(NULL, hPrinter, PrinterName, NULL, pDevMode, DM_OUT_BUFFER);

    // default preparation

    HDC hDC = CreateDC(NULL, PrinterName, NULL, pDevMode);

	SaveDC (hDC);

	SetMapMode(hDC, MM_TEXT);

	

	static DOCINFO di = { sizeof (DOCINFO), TEXT ("Print1: Printing") } ;

	HBITMAP hBitmap = (HBITMAP)LoadImage(NULL, "01.bmp", IMAGE_BITMAP, 0, 0,     

		LR_LOADFROMFILE | LR_CREATEDIBSECTION | LR_DEFAULTSIZE);     

	BITMAP bitmap; 

	::GetObject(hBitmap,sizeof(BITMAP),&bitmap); 

	

	int cxPage = GetDeviceCaps (hDC, HORZRES);

	int cyPage = GetDeviceCaps (hDC, VERTRES);

	

	float scale;

	

	if((float)cxPage/(float)(bitmap.bmWidth) < (float)cyPage/(float)(bitmap.bmHeight))

	{

		scale = (float)cxPage/(float)(bitmap.bmWidth);

	}

	else

	{

		scale = (float)cyPage/(float)(bitmap.bmHeight);

	}

	

	StartDoc (hDC, &di);

	StartPage (hDC);

	

	HDC dcMem; 

	dcMem=::CreateCompatibleDC(hDC); 

	SelectObject(dcMem, hBitmap); 

	

	// 按比例缩放

	::StretchBlt(hDC,0,0,bitmap.bmWidth*scale,bitmap.bmHeight*scale,dcMem,0,0,bitmap.bmWidth,bitmap.bmHeight,SRCCOPY); 

	//	::StretchBlt(hDC,0,0,cxPage,cyPage,dcMem,0,0,bitmap.bmWidth,bitmap.bmHeight,SRCCOPY); 

	delete pDevMode;

	EndPage (hDC);

	EndDoc (hDC);

	RestoreDC (hDC, -1);

	DeleteDC(hDC);

何日复西归 2007-10-28

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看看打印之后，是否又引发了擦除过程。
试一试用mfc做，类似我的代码：
BITMAP s_bitmap;
CBitmap bitmap;
memset(&s_bitmap,0,sizeof(BITMAP));
if(!bitmap.LoadBitmap(IDB_PAGEONE))
{
AfxMessageBox("位图加载失败");
return;
}
bitmap.GetBitmap(&s_bitmap);
CDC compatibleDC;
compatibleDC.CreateCompatibleDC(pDC);
compatibleDC.SelectObject(&bitmap);
pDC->BitBlt(0,0,s_bitmap.bmWidth,s_bitmap.bmHeight,&compatibleDC,0,0,SRCCOPY);