使用GDI的textout在屏幕上显示文本并消失 [英] Using textout of GDI shows text on screen and disapperas

问题描述

我需要使用GDI Textout在屏幕上显示一些文本。使用下面的代码显示屏幕上的文字，但立即消失。任何人都可以纠正我的错误



我尝试了什么：



金额1 =卢比。*******。**

m_hdc = :: GetDC（0） ;

m_nXPos = m_nYPos = 0;

if（m_hdc）

{

m_nXPos = :: GetDeviceCaps（m_hdc，HORZRES）/ 2;

m_nYPos = :: GetDeviceCaps（m_hdc，VERTRES）/ 2;

}

m_nXPos = m_nXPos - 100;

DisplayAmount（m_hdc，m_nXPos，m_nYPos，（LPSTR）（LPCTSTR）Amount1）;

DisplayAmount（m_hdc，m_nXPos，m_nYPos，（LPSTR）（LPCTSTR）Amount1）;



/ *方法定义* /

DisplayAmount（HDC hdc，int XPos，int YPos，char * amount）

{



如果（！hdc）返回-1;



const COLORREF colorRed = RGB （255,255,255）;



HFONT hfont;

LOGFONT logFont;

memset（& logFont，0， sizeof（logFont））;

logFont.lfHeight = -48; //见PS

logFont.lfWeight = FW_NORMAL;



strcpy（logFont.lfFaceName，Zurich BT）;

hfont = CreateFontIndirect（& logFont）;



COLORREF oldTextColor = SetTextColor（hdc，colorRed）;

SetBkMode（hdc，TRANSPARENT）;

HFONT oldHFont =（HFONT） SelectObject（hdc，hfont）;



TextOut（hdc，XPos，YPos，amount，strlen（amount））;







//恢复文字颜色和字体

SelectObject（hdc，oldHFont）;

SetTextColor（hdc，oldTextColor）;





返回0;

}

I need to Display some text on to the screen using GDI Textout. Using the following code displays the text on the screen but immediately disappears.Can any one correct me where i am going wrong

What I have tried:

Amount1 = "Rs.*******.**"
m_hdc = ::GetDC(0);
m_nXPos = m_nYPos = 0;
if(m_hdc)
{
m_nXPos = ::GetDeviceCaps(m_hdc,HORZRES)/2;
m_nYPos = ::GetDeviceCaps(m_hdc,VERTRES)/2;
}
m_nXPos = m_nXPos - 100;
DisplayAmount(m_hdc,m_nXPos,m_nYPos,(LPSTR)(LPCTSTR)Amount1);
DisplayAmount(m_hdc,m_nXPos,m_nYPos,(LPSTR)(LPCTSTR)Amount1);

/*Method Defination*/
DisplayAmount(HDC hdc,int XPos, int YPos, char* amount)
{

if(!hdc) return -1;

const COLORREF colorRed = RGB(255,255,255);

HFONT hfont;
LOGFONT logFont;
memset(&logFont, 0, sizeof(logFont));
logFont.lfHeight = -48; // see PS
logFont.lfWeight = FW_NORMAL;

strcpy(logFont.lfFaceName, "Zurich BT");
hfont = CreateFontIndirect(&logFont);

COLORREF oldTextColor = SetTextColor(hdc, colorRed);
SetBkMode(hdc, TRANSPARENT);
HFONT oldHFont = (HFONT)SelectObject(hdc, hfont);

TextOut(hdc, XPos, YPos, amount, strlen(amount));



// restore text color and font
SelectObject(hdc, oldHFont);
SetTextColor(hdc, oldTextColor);


return 0;
}

推荐答案

这不会起作用;只要您处理 WM_PAINT 消息，就会清除或覆盖您放入屏幕的任何内容。您应保存要显示的信息，并致电 InvalidateRect 功能 [ ^ ]强制重新绘制窗口。然后在 WM_PAINT 处理程序中，绘制/绘制/写入要显示的所有信息。

That is not going to work; as soon as you process a WM_PAINT message, then whatever you have put to the screen will be cleared or overwritten. You should save the information you want to display, and call the InvalidateRect function[^] to force a repaint of your window. Then in your WM_PAINT handler, you do the drawing/painting/writing of all the information that you want displayed.

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