The QDebug class, part of the Qt framework, provides an output stream for debugging information.
Documentation can be found here
Questions tagged [qdebug]
99 questions
2
votes
1 answer
Replace logging backend for console.debug() console.warn()
Qt Quick uses qDebug to perform logging, where the standard Javascript logging methods are maped to a Qt log type
console.log() -> qDebug()
console.debug() -> qDebug()
console.info() -> qDebug()
console.warn() -> qWarning()
console.error() ->…
Simon Warta
- 10,850
- 5
- 40
- 78
2
votes
4 answers
Collect user input using qDebug
I have been wondering if it is possible to collect user input using the qDebug() statement in Qt C++.
I tried do it like in the std C++ code like:
qDebug() >> myvar;
but it didn't work.
How can I read from stdin using Qt?
user2989328
- 33
- 5
2
votes
4 answers
Where is located the qDebug qWarning qCritical and qFatal log by default on Qt?
When running my Qt5 application on linux, I don't see any output from qDebug, qWarning, qCritical or qFatal. I know that I can use qInstallMsgHandler to install a message handler and see them, but this is rather heavyweight.
I just want to check the…
Mildred
- 3,887
- 4
- 36
- 44
2
votes
2 answers
qSin() giving wrong sin values?
I have the code:
for(int i = 0; i < 314; i++){
float nextSine = aSin(i/5);
qDebug() << "i: "<
JVE999
- 3,327
- 10
- 54
- 89
2
votes
2 answers
Qt Console Application - Terminal Won't Stay Open [In Ubuntu]
I recently began developing in Qt, but I am having an issue with console projects. When I run my program (Console Program), terminal opens and then immediately closes so I cannot see the output.
Here is the code that I am using:
#include…
foobar5512
- 2,470
- 5
- 36
- 52
1
vote
2 answers
How to get the precise value from QJsonObject?
I have made code below.
i want correct value as 44112.25895
but result value is 44112.3
how can i fix this issue?
QJsonObject qj{ {"close", 44112.25895} };
qDebug() << qj;
QJsonValue qjv = qj.value("close");
qDebug() << qjv;
qDebug() <<…
steven cn2018
- 13
- 4
1
vote
1 answer
qDebug dosen't print anything when using vscode
I tried to use VSCode to code Qt program,but function qDebug doesn't print anything in console when debugging a Qt program in VSCode.However it works correctly when using QtCreator.By the way,Qt program is built by cmake in vscode.
I tried to place…
Rascal
- 11
- 1
1
vote
1 answer
Can not surpress QDebug output in relesae build
I work on a Qt project and I use cmake. In my CMakeLists.txt I have:
target_compile_definitions(${PROJECT_NAME} PUBLIC
QT_DEBUG_NO_OUTPUT
QT_NO_INFO_OUTPUT
QT_NO_WARNING_OUTPUT
)
and to test that in my main.cpp I…
DEKKER
- 877
- 6
- 19
1
vote
2 answers
QT_MESSAGE_PATTERN not works over raspberry pi crosscompile
I adjust the QT_MESSAGE_PATTERN on build environment both for pc and raspberry.
When I did a run on pc, debug gives me an output as I adjusted but when a did a run on raspberry pi (deployment) , debug gives me an output like I didn't adjust....
here…
bladekel
- 37
- 7
1
vote
0 answers
QFile.read() value into qDebug() into QDataStream
I was wondering why :
QString MainWindow::getFileText(QString filename)
{
QFile test(filename + ".txt"); // The file who gets written into
QFile file(filename); // The executable I am reading
QDataStream in(&test);
…
Nox
- 713
- 7
- 16
1
vote
1 answer
Logs via qDebug() are invisible when run via docker-compose
I have written a Qt application which logs to console via qDebug(). When run inside a docker container, the application logs are visible as normal. But when the same docker image is run via docker-compose up, there is no output visible at all. How…
JaM
- 549
- 4
- 15
1
vote
1 answer
No such file or directory #include
Why I got an error:
I use Qt Creator. Version Qt 5.9.7 for Desktop
Output::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
23:02:13: Uruchamianie "/usr/bin/make"
g++ -c -pipe -g -std=gnu++11 -Wall -W…
AlinaChuj
- 27
- 1
- 5
1
vote
1 answer
Qt debug feed keep spaming newline
I have a problem with the debug feed in QtCreator, it keep spamming newline caracters.
If I remove all qDebug() call in my code it works fine and output nothing.
But if call qDebug once (like qDebug() << "test"; at the start of main for example) it…
Le Moisso
- 11
- 2
1
vote
0 answers
in >> qstr or qstr = in.readLine()
I want to find alternative for cin >>
#include
#include
#include
int main(){
qDebug() << "Test start";
QTextStream in(stdin);
QString qstr;
qstr = in.readLine();
qDebug() << "Test end";
}
Also…
sardorkun
- 87
- 2
- 11
1
vote
1 answer
Prevent qDebug() from writing to std output
I am using qDebug(), qInfo() and so on in combination of qInstallMessageHandler to write my logfiles. I also get an output on my batch screen, when executing my application.
I only found QT_NO_DEBUG_OUTPUT, but I want to toggle this configuration…
Daniel Müller
- 741
- 1
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- 14