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序号：64559 发表者：王小锋 发表日期：2003-12-11 13:51:29
<br>主题：各位大侠，请教一个问题＃pragma
<br>内容：各位大侠，请教一个问题，＃pragma到底有什么用途，能不能提供有关这方面的资料啊<BR>#pragma hdrstop<BR>
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<font color=red>答案被接受</font><br>回复者：冰峰菩提 回复日期：2003-12-11 22:42:07
<br>内容：昨天说的不对，具体内容你可以参考MSDN的解释，以下是我从MSDN转贴过来的<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 <BR><BR>2003-12-12 9:21:31