[英]Expression must have integral or enum type Char*
I have a MFC project which do something like this 我有一个MFC项目,其功能如下
CString getTimeString( void ) { SYSTEMTIME systemTime; CString getTimeString(void){SYSTEMTIME systemTime; CString datestr;
CString datestr;
GetSystemTime( &systemTime );
datestr.Format( "%02i/%02i/%04i, %02i:%02i:%02i",
systemTime.wDay, systemTime.wMonth, systemTime.wYear,
systemTime.wHour, systemTime.wMinute, systemTime.wSecond );
return ( datestr + "; " + get_file_info().PName.c_str() + ", " + get_version_info().PVersion.c_str() );
} }
Now I replicating something like this in QT 现在我在QT中复制这样的内容
char* getTimeString( void )
{
QDateTime systemTime = QDateTime::currentDateTime();
QString datestr = systemTime.toString() ;
/*GetSystemTime( &systemTime );
datestr.Format( "%02i/%02i/%04i, %02i:%02i:%02i",
systemTime.wDay, systemTime.wMonth, systemTime.wYear,
systemTime.wHour, systemTime.wMinute, systemTime.wSecond );
*/
return ( datestr.toStdString().c_str() + "; " + get_file_info().PName.c_str() + ", " + get_version_info().PVersion.c_str() );
}
It throws an error 引发错误
" Expression must have integral or enum type... " “表达式必须具有整数或枚举类型...”
ON closer Look I realise that since its not std::String we cannot add up like this .. S o My question is how would I acheive return function in QT in exact same way as its done in VS2010( shown above). 仔细观察,我意识到,由于它不是std :: String,所以我们不能像这样加起来。S o我的问题是我如何以与VS2010中完成的完全相同的方式在QT中实现return函数(如上所示)。
I would do that in the following way: 我将通过以下方式进行操作:
[..]
return QString("%1; %2, %3")
.arg(datestr)
.arg(QString(get_file_info().PName.c_str()))
.arg(QString(get_version_info().PVersion.c_str())).toLocal8Bit().data();
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