DrawText无法在winxp中工作，就像在win7中一样 [英] DrawText wont work in winxp where as it does in win7

问题描述

我正在使用CRgn Class创建区域的代码，以下是在dc上创建黑色区域的代码段:

Hi,

I am working on a code in which I am creating a region using CRgn Class,the following is the snippet to create black region on dc:

CRect fpsoverlay;
	GetClientRect(&fpsoverlay);
        fpsOverlay.right = fpsOverlay.right - 30;
	CRgn rgn2;
	CBrush bBr2(RGB(0,0,0));
	dc.SelectObject(bBr2);
	int nOldROP2 = dc.GetROP2();
	dc.SetROP2(R2_COPYPEN);
	rgn2.CreateRectRgn(fpsoverlay.left,fpsoverlay.bottom-15,fpsoverlay.right,fpsoverlay.bottom);
	dc.FillRgn(&rgn2,&bBr2);
        SetBkMode(dc,TRANSPARENT);
	SetTextColor(dc,RGB(0,255,0));
        DrawText(dc,"Caption1",-1,fpsoverlay,DT_CENTER);

我将在第一个区域旁边创建另一个区域，并使用不同的文本，如下所示:

I am creating another region next to the first region with different text like the following:

    CRect fpsoverlay1;
GetClientRect(&fpsoverlay1);
    fpsOverlay1.left =  fpsOverlay1.right - 30;
    fpsoverlay1.top = fpsoverlay1.bottom-15;
CRgn rgn1;
CBrush bBr3(RGB(0,0,0));
dc.SelectObject(bBr3);
int nOldROP3 = dc.GetROP2();
dc.SetROP2(R2_COPYPEN);
rgn1.CreateRectRgn(fpsoverlay1.left,fpsoverlay1.top,fpsoverlay1.right,fpsoverlay1.bottom);
dc.FillRgn(&rgn1,&bBr3);
    SetBkMode(dc,TRANSPARENT);
SetTextColor(dc,RGB(0,255,0));
    DrawText(dc,"Caption2",-1,fpsoverlay1,DT_RIGHT);

该代码在Windows7(在此OS上开发)中运行良好，但是当我在Windows XP上使用此ActiveX控件时，第二个区域的标题(即"Caption2")不可见.
请提出解决方案.
在此先感谢

This code works well in Windows7(it is developed on this OS),but when I use this ActiveX control on windows XP the caption of the second region i.e "Caption2" is not visible.
Please suggest the solution.
Thanks in advance

推荐答案

假设并存的fpsOverlay/fpsoverlay只是一个错字，两个字幕的处理方式不同之处在于坐标已处理.

对于Caption2，.top设置为.bottom-15，而不是Caption1.这在调用DrawText时会有所不同(将相同的值传递到CreateRectRgn).

使两个标题的代码相同应该可以缩小问题的范围. (在两个Windows版本下，可能会有不同的剪切策略.)

Assuming that the coexisting fpsOverlay/fpsoverlay is just a typo, the difference between the handling of the two captions lies in the way the coordinates are processed.

For Caption2, .top is set to .bottom-15, not for Caption1. This makes a difference when DrawText is called (identical values are passed to CreateRectRgn).

Making to the code identical for both captions should allow you to narrow down the problem. (Probably a different clipping policy under the two Windows versions).

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