WIN32程序GDI+画图和绘文字

[lb451035525]

用drawimage画图
用drawstring画文字
在一个函数里完成，
用户按一次键盘触发一次函数。
怎么样让图片和文字不闪烁？？？

[冻结]

Google “双缓冲”

[xingzhe2001]

用双缓存就不闪烁了

[冻结]

结帖率：0.00%
楼主要结贴啊！

[lb451035525]

BOOL UpdateDisplay(WNDINFO &wndinfo, DWORD dwButton)
{
BOOL bRet = FALSE;
InitResources();
//m_Blend是结构体BLENDFUNCTION的对象，用于指定两个DC(画图设备)的融合方式。
m_Blend.BlendOp = 0; //theonlyBlendOpdefinedinWindows2000仅仅融合在WINDOUWS2000平台下定义
m_Blend.BlendFlags = 0; //nothingelseisspecial...
m_Blend.AlphaFormat = 1; //...透明度
m_Blend.SourceConstantAlpha = 255;//AC_SRC_ALPHA

//确定透明度
if(Transparent<0||Transparent>100) Transparent = 100;
m_Blend.SourceConstantAlpha = int(Transparent*2.55);//1~255


m_BakWidth = m_pStatusImg->GetWidth();
m_BakHeight = m_pStatusImg->GetHeight();

::SetWindowPos(wndinfo.hWnd, NULL, wndinfo.ptWnd.x, wndinfo.ptWnd.y, m_BakWidth, m_BakHeight,SWP_NOACTIVATE);

HDC hdcTemp, m_hdcMemory, hdcScreen;
//创建画图设备环境
hdcTemp = GetDC(wndinfo.hWnd);
HBITMAP hBitMap = CreateCompatibleBitmap(hdcTemp, m_BakWidth, m_BakHeight);
m_hdcMemory = CreateCompatibleDC(hdcTemp);//创建与显示设备相关的内存设备上下文
SelectObject(m_hdcMemory, hBitMap);
hdcScreen = GetDC (wndinfo.hWnd);

//得到窗体的区域
RECT rct;
GetWindowRect(wndinfo.hWnd,&rct);
POINT ptWinPos = {rct.left,rct.top};
Graphics graph(m_hdcMemory);


Point points[] = { Point(0, 0),Point(m_BakWidth, 0),Point(0, m_BakHeight)};
graph.DrawImage(m_pCCWndImg, points, 3);
//输出字符串
FontFamily fontFamily(_T("Arial"));
Gdiplus::Font font(&fontFamily, 14, FontStyleRegular, UnitPixel);
PointF pointFComp(wndinfo.ptStrComp.x, wndinfo.ptStrComp.y);
PointF pointFCand(wndinfo.ptStrCand.x, wndinfo.ptStrCand.y);
SolidBrush solidBrush(Color(255, 255, 255, 255));
graph.SetTextRenderingHint(TextRenderingHintAntiAlias);
graph.DrawString(stringTowstring(wndinfo.strResultComp).c_str(), -1, &font, pointFComp, &solidBrush);
graph.DrawString(stringTowstring(wndinfo.strResultCand).c_str(), -1, &font, pointFCand, &solidBrush);


#pragma endregion
SIZE sizeWindow = {m_BakWidth, m_BakHeight};
POINT ptSrc = {0, 0};

DWORD dwExStyle = GetWindowLong(wndinfo.hWnd, GWL_EXSTYLE);//GWL_EXSTYLE;获得扩展窗口风格。

if((dwExStyle & 0x80000) != 0x80000)//dwExStyle&0x80000显示alpha透明通道，如为0x80000窗体为透明，否则设置为透明
SetWindowLong(wndinfo.hWnd, GWL_EXSTYLE, dwExStyle^0x80000);

bRet = UpdateLayeredWindow(wndinfo.hWnd, hdcScreen, &ptWinPos,
&sizeWindow, m_hdcMemory, &ptSrc, 0, &m_Blend, 2);

graph.ReleaseHDC(m_hdcMemory);
DeleteObject(hBitMap);
DeleteDC(hdcScreen);
DeleteDC(hdcTemp);
DeleteDC(m_hdcMemory);

hdcScreen = NULL;
hdcTemp = NULL;
m_hdcMemory = NULL;
return bRet;

}

这是我的代码，背景倒是不闪了，就是每按一次按键，文字就会闪。

[npuhuxl]

双缓冲！并处理WM_ERASEBK

[雪域迷影]

对，是双缓冲的问题，上学期我用MFC做了
个推箱子游戏，就是用这个解决的！

[lb451035525]

双缓冲用了，图片不闪了，就是文字闪，因为设备上下文是HDC的，是指针类型的，小弟是个初学者，不知道怎么将文字在hdc中的图片上输出，然后再输出图片。
望给个小例子。我的图片是image*类型的png图片。带透明。
用Drawimage打印图片。

[向立天]

这段代码你可以参考一下

	HDC hdcTemp, hdcMemory;
	hdcTemp		= GetDC()->m_hDC;
	hdcMemory	= CreateCompatibleDC(hdcTemp);

	//使内存DC存放位图
	HBITMAP hBitMap	= CreateCompatibleBitmap(hdcTemp, m_nWidth, m_nHeigth);
	SelectObject(hdcMemory, hBitMap);

	//设置Alpha值
	m_blendFunc.SourceConstantAlpha	= int(255*nTransparent/100);

	//获取本窗口DC
	HDC hdcScreen	= ::GetDC(m_hWnd);

	//将PNG图画入内存
	Graphics graph(hdcMemory);

	Point points[] ={
						Point(0, 0), 
						Point(m_nWidth, 0), 
						Point(0, m_nHeigth)
					};

	graph.DrawImage(m_pImageTip, points, 3);

	//绘制标题
	DrawTitle(&graph);

	SolidBrush* pBrush	= new SolidBrush(Color::White);
	graph.FillRectangle(pBrush, 20, 40, m_nWidth-40, m_nHeigth-80);
	delete	pBrush;

其中DrawTitle(Graphics* pGraph)

	FontFamily	fontFamily(L"宋体");
	Font		font(&fontFamily, 12, FontStyleBold, UnitPoint);
	SolidBrush	solidBrush(Color(255, 255, 255, 255));
	PointF		pointF(20, 15);
	PWSTR		pWideCharStr;
	int			nLenOfWideCharStr;

	nLenOfWideCharStr	= MultiByteToWideChar(CP_ACP, 0, LPCSTR(m_strTitle), -1, NULL, 0);
	pWideCharStr		= (PWSTR)HeapAlloc(GetProcessHeap(), 0, nLenOfWideCharStr*sizeof(wchar_t));
	if(pWideCharStr!=NULL)
	{
		MultiByteToWideChar(CP_ACP, 0, LPCSTR(m_strTitle), m_strTitle.GetLength()+1, pWideCharStr, nLenOfWideCharStr);
		pGraph->DrawString(pWideCharStr, nLenOfWideCharStr, &font, pointF, &solidBrush);
		HeapFree(GetProcessHeap(), 0, pWideCharStr);
	}

[lb451035525]

谢谢你们大家了。问题解决了，