急！！打印不出图形

[OPT_lezhehao]

我用opengl画图，然后用虚拟打印机打印成pdf显示，但是pdf出来了，却没有图形，让人很困惑。

CString strDefualtDev = TEXT("");
	PRINTDLG pd;
	LPDEVMODE lpDevMode;
	if(AfxGetApp()->GetPrinterDeviceDefaults(&pd))
	{
		lpDevMode=(LPDEVMODE)GlobalLock(pd.hDevMode);
		if(lpDevMode)
		{ 
			strDefualtDev = lpDevMode->dmDeviceName;
		}
		GlobalUnlock(pd.hDevMode);
	}
	if(AfxGetApp()->GetPrinterDeviceDefaults(&pd))   
	{
		lpDevMode=(LPDEVMODE)GlobalLock(pd.hDevMode);       
		if(lpDevMode)
		{ 
			lpDevMode->dmPaperSize=DMPAPER_A4;    // 设定打印纸张幅面
			lpDevMode->dmOrientation=DMORIENT_LANDSCAPE; // 设定横向打印
			lpDevMode->dmPrintQuality=600;     // 设定打印机分辨率
		}  
		GlobalUnlock(pd.hDevMode);
		ResetDC(pd.hDC, lpDevMode);
	}
	DOCINFO info;
	memset( &info, 0, sizeof(DOCINFO) );
	info.cbSize = sizeof(DOCINFO); 
	info.lpszDocName = _T("打印图形"); // 设定打印文档名称
	info.lpszOutput = (LPTSTR) NULL; 
	info.fwType = 0; 
	HDC hdc = ::CreateDC(NULL, _T("pdfFactory Pro"), NULL, lpDevMode); // 得到打印机设备句柄
	int a = StartDoc(hdc,&info);
	StartPage(hdc);

	HDC hdc2 = GetDC(hWnd);
	PIXELFORMATDESCRIPTOR *pfd=new PIXELFORMATDESCRIPTOR;
	pfd->nSize=sizeof(PIXELFORMATDESCRIPTOR);
	pfd->nVersion=1;
	pfd->dwFlags=PFD_DRAW_TO_WINDOW|PFD_SUPPORT_OPENGL|PFD_DOUBLEBUFFER|PFD_STEREO_DONTCARE;
	pfd->iPixelType=PFD_TYPE_RGBA;
	pfd->cColorBits=32;
	pfd->cRedBits=8;
	pfd->cRedShift=16;
	pfd->cGreenBits=8;
	pfd->cGreenShift=8;
	pfd->cBlueBits=8;
	pfd->cBlueShift=0;
	pfd->cAlphaBits=0;
	pfd->cAlphaShift=0;
	pfd->cAccumBits=64;
	pfd->cAccumRedBits=16;
	pfd->cAccumGreenBits=16;
	pfd->cAccumBlueBits=16;
	pfd->cAccumAlphaBits=0;
	pfd->cDepthBits=32;
	pfd->cStencilBits=8;
	pfd->cAuxBuffers=0;
	pfd->iLayerType=PFD_MAIN_PLANE;
	pfd->bReserved=0;
	pfd->dwLayerMask=0;
	pfd->dwVisibleMask=0;
	pfd->dwDamageMask=0;
	
	int informat = ChoosePixelFormat(hdc2,pfd);
	if (informat == 0)
	{
		if (DescribePixelFormat(hdc2,informat,sizeof(PIXELFORMATDESCRIPTOR), pfd)==0)
		{
			return;
		}
		informat = 1;
	}
	if (::SetPixelFormat(hdc2, informat, pfd) == FALSE)
	{
		return;
	}

	HGLRC hrc = wglCreateContext(hdc2);
	if(hrc!=NULL)
	{
		BOOL flag = wglMakeCurrent(hdc2,hrc);
		int a= 0;
	}

	glMatrixMode(GL_MODELVIEW);      // To operate on Model-View matrix
	glLoadIdentity();

	glPushMatrix();
	glColor3f(1.0,0.0,1.0);  
	glBegin(GL_POLYGON);
	glVertex2f(100,2);
	glVertex2f(4,130);
	glVertex2f(4,170);
	glEnd();
	glPopMatrix();

	wglMakeCurrent(NULL,NULL);//断开与着色环境的联系

	EndPage(hdc);
	EndDoc(hdc);

[OPT_lezhehao]

glMatrixMode(GL_MODELVIEW);      // To operate on Model-View matrix
    glLoadIdentity();
 
    glPushMatrix();
    glColor3f(1.0,0.0,1.0);  
    glBegin(GL_POLYGON);
    glVertex2f(100,2);
    glVertex2f(4,130);
    glVertex2f(4,170);
    glEnd();
    glPopMatrix();

我试了下没问题啊

[图灵狗]

你PDF用的是hdc，而OpenGL却在hdc2上渲染。

引用 3 楼 OPT_lezhehao 的回复:

glMatrixMode(GL_MODELVIEW);      // To operate on Model-View matrix
    glLoadIdentity();
 
    glPushMatrix();
    glColor3f(1.0,0.0,1.0);  
    glBegin(GL_POLYGON);
    glVertex2f(100,2);
    glVertex2f(4,130);
    glVertex2f(4,170);
    glEnd();
    glPopMatrix();

我试了下没问题啊

[OPT_lezhehao]

hdc是打印机的句柄，hdc2是对话框的m_hwnd->GetSafeHdc(); 我把hdc2改成了hdc还是一样的。。。，不知道我是不是哪里搞错了。。。

[OPT_lezhehao]

难道CSDN高手都离开了？

[OPT_lezhehao]

先结贴，以后看看有没有答案。

[图灵狗]

可以把单独的OpenGL代码拿出来，看看是否本身渲染就有问题。

[ryfdizuo]

单独看gl渲染代码，全部采用默认设置的话，看着没啥问题。