subject_54173.htm

vc

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序号：54173 发表者：莹莹菜 发表日期：2003-09-26 09:37:11
<br>主题：学习VC第十一天的问题
<br>内容：我用的自学教材是《学用visual c++6.0》，我认为讲得还不错，因为我没有基础，今天是第十一天学习vc，有看过这本书的朋友，我真希望能够加我为好友，以后请多多指教！<BR><BR>今天按照教材做Fonts练习时，出现bug提示：<BR>Debug Assertion Failed!<BR>Program: E:\Myprogram\Debug\Myprogram.exe<BR>Line: 1120<BR>For information on how your program can cause an assertion failure, <BR>see the Visuall C++ documentation on asserts.<BR><BR>(Press Retry to debug the application)<BR><BR>请问这是什么原因？<BR><BR>顺便问一下，怎样把提示信息框保存下来？<BR>
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回复者：iamhere 回复日期：2003-09-26 09:53:03
<br>内容：点击Retry，看看Call Stack中程序停留在哪句话上
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回复者：莹莹菜 回复日期：2003-09-26 10:13:29
<br>内容：点击Retry后出现应用程序关闭的提示:<BR>Myprogram.exe 遇到问题需要关闭。我们对此引起的不便表示抱歉。<BR>......<BR><BR>和其它Windows应用程序bug的提示一样<BR><BR>（还是不知道怎样把提示信息框保存下来，你知道吗？）<BR><BR>
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回复者：iamhere 回复日期：2003-09-26 10:15:43
<br>内容：在VC中按F5在Debug方式下运行，<BR>出错后查看Call Stack
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回复者：莹莹菜 回复日期：2003-09-26 10:59:49
<br>内容：按你说的做了，按F5在Debug方式下运行，出现关闭提示后点击Retry,双箭头(==&gt;&gt;)指向如下：<BR>BOOL CGdiObject::Attach(HGDIOBJ hObject)<BR>{<BR>&nbsp;&nbsp;==&gt;&gt;&nbsp;&nbsp; ASSERT(m_hObject == NULL);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// only attach once, detach on destroy<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (hObject == NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CHandleMap* pMap = afxMapHGDIOBJ(TRUE); // create map if not exist<BR>&nbsp;&nbsp;&nbsp;&nbsp;ASSERT(pMap != NULL);<BR>&nbsp;&nbsp;&nbsp;&nbsp;pMap-&gt;SetPermanent(m_hObject = hObject, this);<BR>&nbsp;&nbsp;&nbsp;&nbsp;return TRUE;<BR>}<BR><BR>拜托问一下，Call Stack什么意思，怎么查看？
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<font color=red>答案被接受</font><br>回复者：iamhere 回复日期：2003-09-26 11:10:01
<br>内容：在你Retry之后，箭头指向如下的地方，<BR>菜单View－Debug Windows－Call Stack<BR>在新的Call Stack窗口中，从上到下依次点击过来，<BR>看到哪句话是你程序中真正的内容，将前后的语句一起贴出来
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回复者：莹莹菜 回复日期：2003-09-26 12:32:57
<br>内容：谢谢iamhere！找到原因了，你能结合下面标出的语句给我解释一下Call Stack吗？<BR><BR>void CDay7Dlg::SetMyFont()<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CRect rRect;&nbsp;&nbsp; // The rectangle of the display area<BR>&nbsp;&nbsp;&nbsp;&nbsp;int iHeight;&nbsp;&nbsp; // the heiht of the display area<BR>&nbsp;&nbsp;&nbsp;&nbsp;int iItalic = 0;&nbsp;&nbsp; // Italicize the font?<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Has a font been selected?<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (m_strFontList != &#34;&#34;)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Get the dimensions of the font sample display area<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_ctlDisplayText.GetWindowRect(&amp;rRect);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Calculate the area height<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iHeight = rRect.top - rRect.bottom;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Make sure the height is positive<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (iHeight &lt; 0)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iHeight = 0 - iHeight;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// should the font be italicized?<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (m_bItalic)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iItalic = 1;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Release the current font<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;big&gt; m_fSampFont.Detach();&nbsp;&nbsp; 原来少了这一句&lt;/big&gt;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Creat the font to be used<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_fSampFont.CreateFont((iHeight - 5), 0, 0, 0, FW_NORMAL, iItalic, 0, 0, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, m_strFontList);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Set the font for the sample display area<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_ctlDisplayText.SetFont(&amp;m_fSampFont);<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>}
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回复者：iamhere 回复日期：2003-09-26 13:58:09
<br>内容：Call Stack调用堆栈，<BR>在这里可以看出函数调用的先后顺序，<BR>假如说在函数a中调用了函数b，那么在该调用堆栈中就是b在上，a在下<BR><BR>Call Stack在程序调试时定位错误点等方面非常有用
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回复者：莹莹菜 回复日期：2003-09-26 15:35:25
<br>内容：知道了，谢谢！！！<BR>
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