subject_61326.htm

vc

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序号：61326 发表者：rhj888 发表日期：2003-11-19 10:31:45
<br>主题：#pragma XXXX是什么意思呀?
<br>内容：#pragma XXXX是什么意思呀?
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<font color=red>答案被接受</font><br>回复者：浪际天涯 回复日期：2003-11-19 10:47:44
<br>内容：表示给编译器一个编译的指示，如何去编译其后的代码，例如：<BR>#pragma once指示编译器在编译时，该文件中其后的代码在整个构建过程中只编译一次
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回复者：rhj888 回复日期：2003-11-19 10:55:34
<br>内容：那么#pragma hdrstop又是什么意思?
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回复者：浪际天涯 回复日期：2003-11-19 11:23:03
<br>内容：这个我也没用过，你可以看一下MSDN上的解释，我看了一下，英文不行，所以看得不太懂<BR>大概是说它是用来控制编译头文件工作，一般情况下是不被理睬的，除非你指定了/YX or /Yc，当程序编译到这里时将保存一个编译状态，在以后已经保存到编译状态里的代码将不会被保存。<BR><BR>申明：我英文很差，上面说的是胡说八道，个人理解，大家不要笑我，也不要仍飞刀呀<BR><BR>hdrstop<BR>#pragma hdrstop [( &#34;filename&#34; )]&nbsp;&nbsp;<BR><BR>Controls the way precompiled headers work. The filename is the name of the precompiled header file to use or create (depending on whether /Yu or /Yc is specified). If filename does not contain a path specification, the precompiled header file is assumed to be in the same directory as the source file. Any filename is ignored when /YX, the automatic precompiled header option, is specified. <BR><BR>If a C or C++ file contains a hdrstop pragma when compiled with either /YX or /Yc, the compiler saves the state of the compilation up to the location of the pragma. The compiled state of any code that follows the pragma is not saved. <BR><BR>The hdrstop pragma cannot occur inside a header file. It must occur in the source file at the file level; that is, it cannot occur within any data or function declaration or definition.<BR><BR>Note&nbsp;&nbsp; The hdrstop pragma is ignored unless either the /YX option is specified or the /Yu or /Yc option is specified without a filename.<BR><BR>Use filename to name the precompiled header file in which the compiled state is saved. A space between hdrstop and filename is optional. The filename specified in the hdrstop pragma is a string and is therefore subject to the constraints of any C or C++ string. In particular, you must enclose it in quotation marks as shown in the following example:<BR><BR>#pragma hdrstop( &#34;c:\projects\include\myinc.pch&#34; )<BR><BR>The name of the precompiled header file is determined according to the following rules, in order of precedence: <BR><BR>The argument to the /Fp compiler option<BR><BR><BR>The filename argument to #pragma hdrstop<BR><BR><BR>The base name of the source file with a .PCH extension 
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