QString的解析系統變量

Question

我應該如何解析的QString，它包含系統變量我想要什麼？

QString path = "%WINDIR%\\System32\\"; 
QString output = parse(path); 
QDebug()<<output; \\ output is "C:\\Windows\\System32\\" 

Answer 1

我想你想是這樣的：

// Untested 
QString parse(QString str) 
{ 
    int pos = 0; 
    QRegExp rx("%([^%]+)%"); // Match env var between two '%' 
    rx.setMinimal(true); 
    while((pos = rx.indexIn(str, pos)) != -1) 
    { 
     // Replace env var 
     QString capture = rx.cap(1); 
     QString replacement = getenv(capture.toAscii()); 
     str.replace("%" + capture + "%", replacement); 

     // Skip env var + two '%' 
     pos += rx.matchedLength() + 2; 
    } 
    return str; 
} 

QString path = parse("%WINDIR%\\System32"); 

Answer 2

我想，這是你在尋找什麼。請試試這個

QString windir = getenv ("WINDIR"); // Expanded 
if (windir.isEmpty()) { 
    fprintf(stderr, "Generator requires WINDIRto be set\n"); 

}  
windir += "\\System32"; 
qDebug()<<windir;