| 术语 | getenvironmentvariable |
| 释义 | GetEnvironmentVariable 语法： C++ DWORD WINAPI GetEnvironmentVariable( __in_opt LPCTSTR lpName, __out_opt LPTSTR lpBuffer, __in DWORD nSize ); GetEnvironmentVariable函数 检索的内容，从调用进程环境块指定的变量。 参数 lpName [中，可选] 环境变量的名称。 lpBuffer [指出，可选] 一个缓冲区，接收指定的环境变量的内容为空指针结尾的字符串。一个环境变量有32,767个字符，包括空终止字符的最大大小限制。 nSize [in] 缓冲区的大小指向的lpBuffer参数，以字符。 返回值 如果函数成功，返回值是存储在缓冲区中的字符数指向lpBuffer，不包括终止空字符。 如果lpBuffer是不够大，无法保存数据，返回值是缓冲区的大小，以字符，须持有该字符串和终止空字符。 如果函数失败，返回值是零。如果指定的环境变量不是在环境块发现，GetLastError返回ERROR_ENVVAR_NOT_FOUND。 备注 此功能也可以检索系统环境变量或用户环境变量。 实例 有关示例，请参阅更改环境变量。 要求： 最低支持：client－Windows 2000专业版 最低支持server－Windows 2000服务器 HeaderWinbase.h(头文件：winuser.h) LibraryKernel32.lib DLLKernel32.dll Unicode和ANSI namesGetEnvironmentVariableW(Unicode)和GetEnvironmentVariableA(ANSI)的 参见 环境变量 GetEnvironmentStrings SetEnvironmentVariable 如果有任何问题和意见，请发送给微软(wsddocfb@microsoft.com) 生成日期：2009年8月27日 ＝＝英文原文＝＝GetEnvironmentVariable Function Retrieves the contents of the specified variable from the environment block of the calling process. Syntax C++ DWORD WINAPI GetEnvironmentVariable( __in_opt LPCTSTR lpName, __out_opt LPTSTR lpBuffer, __in DWORD nSize ); Parameters lpName [in, optional] The name of the environment variable. lpBuffer [out, optional] A pointer to a buffer that receives the contents of the specified environment variable as a null-terminated string. An environment variable has a maximum size limit of 32,767 characters, including the null-terminating character. nSize [in] The size of the buffer pointed to by the lpBuffer parameter, in characters. Return Value If the function succeeds, the return value is the number of characters stored in the buffer pointed to by lpBuffer, not including the terminating null character. If lpBuffer is not large enough to hold the data, the return value is the buffer size, in characters, required to hold the string and its terminating null character. If the function fails, the return value is zero. If the specified environment variable was not found in the environment block, GetLastError returns ERROR_ENVVAR_NOT_FOUND. Remarks This function can retrieve either a system environment variable or a user environment variable. Examples For an example, see Changing Environment Variables . Requirements Minimum supported clientWindows 2000 Professional Minimum supported serverWindows 2000 Server HeaderWinbase.h (include Windows.h) LibraryKernel32.lib DLLKernel32.dll Unicode and ANSI namesGetEnvironmentVariableW (Unicode) and GetEnvironmentVariableA (ANSI) See Also Environment Variables GetEnvironmentStrings SetEnvironmentVariable Send comments about this topic to Microsoft Build date: 8/27/2009 ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/ms683188(VS.85).aspx\n |
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