关于dc-> DrawText的谜团 [英] Mystery about dc->DrawText
问题描述
我们有代码显示文字，看起来像是：
   的CRect outRect（0，
           m_charHeight * SPACER *线，
 &NBSP ;        （m_charWidth +计数 - 1）* m_charWidth，
       &NBSP ; m_charHeight * SPACER *（第+行））;
$
    DC-> DrawText的（outLine.data（），outRect，DT_SINGLELINE | DT_NOPREFIX）;
这工作没有任何问题，直到一个客户报告文本不显示在所有。 我们注意到，在他们的情况下，行很长，每行10001个字符。 我试图缩短行长度，发现我们的代码最多可以达到4095. 当它超过
时，它就不会显示任何内容。
第二天，当我尝试向WebEx的同事演示此问题时，我发现一切正常。 无论线路有多长，都可以。 但是，一旦我停止共享桌面，它就会再次停止工作。 我再次尝试了这个和
，它总是这样。 然后我尝试与Skype共享桌面，Skype没有神奇的WebEx。
我打印出区域坐标和文本以便在WebEx上共享而不是，他们都是一样的。 必须是因为WebEx影响了直流中的一些属性，但是当我试图在调试器中看到dc时，我真的看不到任何东西。
我不知道这个问题，你能给我任何线索吗？  谢谢
喜ezdreams，
感谢在这里发帖
>>我对这个问题一无所知，你能给我任何线索吗？ 谢谢。
您是否尝试使用DT_NOCLIP指定绘图而不剪切或删除DT_SINGLELINE？并您尝试使用
DrawText的
以数量的字符，与
CDC :: DrawTextEx ？
除非使用DT_NOCLIP格式，否则DrawText会剪切文本，使文本不会出现在给定矩形之外。除非给出DT_SINGLELINE格式，否则假定所有格式都有多行。如果所选字体对于
指定的矩形而言太大，则DrawText成员函数不会尝试替换较小的字体。
希望这可能对您有帮助。
最好的问候，
Sera Yu
Hi, we have code to show text, it looks like:
CRect outRect(0,
m_charHeight * SPACER * line,
(m_charWidth + count - 1) * m_charWidth,
m_charHeight * SPACER * (line + 1));
dc->DrawText(outLine.data(),outRect,DT_SINGLELINE | DT_NOPREFIX);
This works without any problem until one customer reported text doesn't show at all. We noticed in their case, the line is very long, 10001 characters per line. I tried to reduce line length and found our code works up to 4095. When it's more than that, then it doesn't show anything.
On the next day, when I try to demo this issue to my co-worker with WebEx, I found everything works. No matter how long the line is, it works. However, as soon as I stopped sharing my desktop, it stopped work again. I tried this again and again, it is always like this. Then I tried to share desktop with Skype, Skype doesn't have the magic as WebEx.
I printed out region co-ordinates and text in case sharing on WebEx and not, they are all same. It must be due to WebEx effected some properties in the dc, but when I tried to look dc in debugger, I really can't see anything there.
I have no clue on this issue, could you give me any clue on this? Thank you.
Hi ezdreams,
thanks for posting here.
>>I have no clue on this issue, could you give me any clue on this? Thank you.
Have you tried to use DT_NOCLIP which specifies drawing without clipping or remove DT_SINGLELINE ? And have you tried to use DrawText with the number of characters or with CDC::DrawTextEx?
Unless the DT_NOCLIP format is used, DrawText clips the text so that the text does not appear outside the given rectangle. All formatting is assumed to have multiple lines unless the DT_SINGLELINE format is given. If the selected font is too large for the specified rectangle, the DrawText member function does not attempt to substitute a smaller font.
Hope this could be help of you.
Best Regards,
Sera Yu
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