📄 csdn_文档中心_使用vc开发程序经验谈（二 续）.htm
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</SPAN>CShape Shape;<o:p></o:p></SPAN></P>
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</SPAN><SPAN
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</SPAN>CMyArc *pArc=new
CMyArc(CMyXYZ(100,100,0),CMyXYZ(100,20,0),CMyXYZ(180,100,0));<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
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style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>Shape.m_List.insert(Shape.m_List.end(),pArc);<o:p></o:p></SPAN></P>
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style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
lang=EN-US
style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>CMyPolyLn *pPolyln=new CMyPolyLn;<o:p></o:p></SPAN></P>
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</SPAN><SPAN
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</SPAN>CMyXYZ xyz(1,1,0);<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
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</SPAN><SPAN
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</SPAN>pPolyln->AddPoint(&xyz);<o:p></o:p></SPAN></P>
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</SPAN><SPAN
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</SPAN>xyz.x=2;<o:p></o:p></SPAN></P>
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style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>xyz.y=2;<o:p></o:p></SPAN></P>
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style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
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style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>pPolyln->AddPoint(&xyz);<o:p></o:p></SPAN></P>
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lang=EN-US
style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>xyz.x=2;<o:p></o:p></SPAN></P>
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style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
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style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>xyz.y=1;<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
lang=EN-US
style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>pPolyln->AddPoint(&xyz);<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"><SPAN
lang=EN-US
style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt"><SPAN
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</SPAN><SPAN
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</SPAN>Shape.m_List.insert(Shape.m_List.end(),pPolyln);<o:p></o:p></SPAN></P>
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</SPAN><SPAN
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</SPAN>Shape.Draw((</SPAN><SPAN lang=EN-US
style="COLOR: blue; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt">long</SPAN><SPAN
lang=EN-US
style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt">)pDC->m_hDC);<o:p></o:p></SPAN></P>
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</SPAN>}<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
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lang=EN-US
style="COLOR: black; FONT-SIZE: 10pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 0pt">}<o:p></o:p></SPAN></P>
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lang=EN-US><SPAN
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</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">先不要急着运行，现在运行的话会出现一些断言的错误，这是由于你在主程序中</SPAN><SPAN
lang=EN-US>new</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">出来空间，而在</SPAN><SPAN
lang=EN-US>DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中释放而造成的（</SPAN><SPAN
lang=EN-US>CShape</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的析构函数在</SPAN><SPAN
lang=EN-US>DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中释放内存），解决该问题的方法详细说明如下：</SPAN></FONT></P>
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lang=EN-US><FONT size=3> <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">用</SPAN><SPAN
lang=EN-US>GlobalAlloc()</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代替</SPAN><SPAN
lang=EN-US>new, </SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">用</SPAN><SPAN
lang=EN-US>GlobalFree() </SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代替</SPAN><SPAN
lang=EN-US>delete</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就不会出错了</SPAN><SPAN
lang=EN-US><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其实还有一个办法，就是把</SPAN><SPAN
lang=EN-US>dll</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN
lang=EN-US>Settings</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN
lang=EN-US>C/C++</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选项卡的</SPAN><SPAN
lang=EN-US>Code Generation</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN
lang=EN-US>Use Run-time liberary</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">改成</SPAN><SPAN
lang=EN-US>Debug Multithreaded DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，在</SPAN><SPAN
lang=EN-US>Release</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">版本中改成</SPAN><SPAN
lang=EN-US>Multithreaded DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，就可以直接使用</SPAN><SPAN
lang=EN-US>new</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN
lang=EN-US>delete</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">了，没问题</SPAN><SPAN
lang=EN-US><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">比较规范点的做法一般是</SPAN><SPAN
lang=EN-US>DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分配的内存由</SPAN><SPAN
lang=EN-US>DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">释放。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3> <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-US><SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这里采用设置</SPAN><SPAN
lang=EN-US>Debug Multithreaded DLL</SPAN><SPAN
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