Using ANSI-Compliant Predefined Preprocessor Macros

最新推荐文章于 2017-04-19 16:42:11 发布

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本文介绍了一个示例函数，该函数演示了如何在C/C++中使用ANSI标准预定义预处理器宏来获取源文件名、修改时间戳、编译日期、当前行号及是否遵循ANSI C/C++标准。

Using ANSI-Compliant Predefined Preprocessor Macros

A sample function that uses ANSI-Compliant Predefined Preprocessor Macros:

bool CPreprocessingDlg::UseANSICompliantPredefinedMacros(void)
{
    // Using ANSI-Compliant Predefined Preprocessor Macros
    TCHAR buffer[MAX_PATH];
    CString m_strOutput;
    m_strOutput += "-- ANSI-Compliant Predefined Macros --";
    m_strOutput += "\r\n";
    m_strOutput += "SOURCE FILE [__FILE__]:";
    m_strOutput += __FILE__;
    m_strOutput += "\r\n";
    m_strOutput += "MODIFIED [__TIMESTAMP__]:";
    m_strOutput += __TIMESTAMP__;
    m_strOutput += "\r\n";
    m_strOutput += "COMPILED [__DATE__]:";
    m_strOutput += __DATE__;
    m_strOutput += " at ";
    m_strOutput += __TIME__;
    m_strOutput += "\r\n";
    m_strOutput += "This is line number [__LINE__]:";
    swprintf_s(buffer, MAX_PATH, TEXT("%d"), __LINE__);
    m_strOutput += buffer;
    m_strOutput += "\r\n";
    m_strOutput += "ANSI C/C++ Standard Conformance [__STDC__]:";
#ifdef __STDC__
    swprintf_s(buffer, MAX_PATH, TEXT("%s"), TEXT("YES"));
#else
    swprintf_s(buffer, MAX_PATH, TEXT("%s"), TEXT("NO"));
#endif
    m_strOutput += buffer;
    return false;
}

When the function finishes m_strOutput contains a string looking something like this:

-- ANSI-Compliant Predefined Macros --
SOURCE FILE [__FILE__]:f:\my source code\preprocessing\preprocessing\preprocessingdlg.cpp
MODIFIED [__TIMESTAMP__]:Wed Nov  4 13:24:24 2009
COMPILED [__DATE__]:Nov  4 2009 at 13:24:25
This is line number [__LINE__]:184
ANSI C/C++ Standard Conformance [__STDC__]:NO