Question

以下MFC程序（取自this question）有明显错误，因为格式说明符与实际参数类型不匹配：

#include <afx.h>

int main()
{
    int const a = 0;
    ULONGLONG const len = 1000;
    ULONGLONG const pos = 800;
    double const perc = static_cast<double>( pos ) / static_cast<double>( len * 100 ); 

    TRACE( "load from %X, Position: %ld, Length: %ld, Perc: %lf \n", 
           &a, pos, len, perc ); 
}

然而，没有编译器警告。我已经在调试配置中构建了这个警告级别4.代码分析也没有提出任何内容。

TRACE取代printf时会出现警告：

printf("load from %X, Position: %ld, Length: %ld, Perc: %lf \n", 
       &a, pos, len, perc );

编译器警告（省略重复）：

warning C4477: "printf": The format string "% X" requires an argument of type "unsigned int", but the variadic argument "1" has the type "int *".
warning C4477: "printf": The format string "% ld" requires an argument of type "long", but the variadic argument "2" has the type "ULONGLONG".
note: If necessary, use% lld in the format string.
note: If necessary, use "% I64d" in the format string.
warning C6273: A non-integer was passed as _Param_ (2). However, calling "printf" requires an integer. Actual type: "int *". If a pointer value is passed,% p should be used.
warning C6328: Size Conflict: "unsigned __int64" was passed as _Param_ (3). However, calling "printf" requires "int".
warning C6340: Sign conflict: "unsigned __int64" is passed as _Param_ (3) if a signed type is required in the call to "printf".

TRACE替换CString::Format()不会产生编译器警告，但启用代码分析会产生类似的警告。

是否有可能在现有代码中错误使用TRACE / ATLTRACE宏时产生此类警告（编译器警告或代码分析警告）？

如何启用错误使用TRACE / ATLTRACE的警告

0 个答案: