subject_34937.htm

vc

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序号：34937 发表者：xiao mi 发表日期：2003-04-03 04:06:42
<br>主题：如何查询系统变量 in&nbsp;&nbsp;VC？
<br>内容：怎么才能找到(Win98/2000)系统环境变量在VC中，比如：<BR>我有一个系统环境变量datapath, 它指定了<BR>一些数据文件的path, 我该怎么<BR>找到这一变量呢，谢谢！(Win98/2000)
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<font color=red>答案被接受</font><br>回复者：微笑的撒旦 回复日期：2003-04-03 07:54:43
<br>内容：char szBuf[256] = "\0";<BR>GetEnvironmentVariable("datapath", szBuf, 256);<BR>
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回复者：Merlin 回复日期：2003-04-03 09:25:45
<br>内容：#include &lt;stdlib.h&gt;<BR>#include &lt;stdio.h&gt;<BR><BR>void main( void )<BR>{<BR>&nbsp;&nbsp; char *libvar;<BR><BR>&nbsp;&nbsp; /* Get the value of the LIB environment variable. */<BR>&nbsp;&nbsp; libvar = getenv( "LIB" );<BR><BR>&nbsp;&nbsp; if( libvar != NULL )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf( "Original LIB variable is: %s\n", libvar );<BR><BR>&nbsp;&nbsp; /* Attempt to change path. Note that this only affects the environment<BR>&nbsp;&nbsp;&nbsp;&nbsp;* variable of the current process. The command processor's environment<BR>&nbsp;&nbsp;&nbsp;&nbsp;* is not changed.<BR>&nbsp;&nbsp;&nbsp;&nbsp;*/<BR>&nbsp;&nbsp; _putenv( "LIB=c:\\mylib;c:\\yourlib" );<BR><BR>&nbsp;&nbsp; /* Get new value. */<BR>&nbsp;&nbsp; libvar = getenv( "LIB" );<BR><BR>&nbsp;&nbsp; if( libvar != NULL )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf( "New LIB variable is: %s\n", libvar );<BR>}<BR>
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