問題描述
我正在使用 Qt4 和 C++ 來制作一些計算機圖形程序.我需要能夠在運行時在我的控制臺中打印一些變量，而不是調試，但是即使我添加了庫，cout 似乎也不起作用.有沒有辦法做到這一點?
I'm using Qt4 and C++ for making some programs in computer graphics. I need to be able to print some variables in my console at run-time, not debugging, but cout doesn't seem to work even if I add the libraries. Is there a way to do this?
推薦答案
如果打印到 stderr 足夠好，您可以使用以下最初用于調試的流:
If it is good enough to print to stderr, you can use the following streams originally intended for debugging:
#include<QDebug>
//qInfo is qt5.5+ only.
qInfo() << "C++ Style Info Message";
qInfo( "C Style Info Message" );
qDebug() << "C++ Style Debug Message";
qDebug( "C Style Debug Message" );
qWarning() << "C++ Style Warning Message";
qWarning( "C Style Warning Message" );
qCritical() << "C++ Style Critical Error Message";
qCritical( "C Style Critical Error Message" );
// qFatal does not have a C++ style method.
qFatal( "C Style Fatal Error Message" );
盡管如評論中所指出的，請記住，如果定義了 QT_NO_DEBUG_OUTPUT，則會刪除 qDebug 消息
Though as pointed out in the comments, bear in mind qDebug messages are removed if QT_NO_DEBUG_OUTPUT is defined
如果你需要標準輸出，你可以嘗試這樣的事情(正如凱爾斯特蘭德指出的那樣):
If you need stdout you could try something like this (as Kyle Strand has pointed out):
QTextStream& qStdOut()
{
static QTextStream ts( stdout );
return ts;
}
然后您可以按如下方式調用:
You could then call as follows:
qStdOut() << "std out!";
這篇關于使用Qt時如何打印到控制臺的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！