how to create Singleinstance application
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@Bharth
You can make use ofQtSingleApplicationhttps://doc.qt.io/archives/qtextended4.4/qtopiadesktop/qtsingleapplication.html
How to use them here.
Good example by usingQLockFilehttp://blog.aeguana.com/2015/10/15/how-to-run-a-single-app-instance-in-qt/@Ratzz said in how to create Singleinstance application:
@Bharth
You can make use ofQtSingleApplicationhttps://doc.qt.io/archives/qtextended4.4/qtopiadesktop/qtsingleapplication.html
How to use them here.i checked this one it is showing file not found
#include<QtSingleApplication> -
@Ratzz said in how to create Singleinstance application:
@Bharth
You can make use ofQtSingleApplicationhttps://doc.qt.io/archives/qtextended4.4/qtopiadesktop/qtsingleapplication.html
How to use them here.i checked this one it is showing file not found
#include<QtSingleApplication> -
@Bharth
I do this via a QSharedMemory instance, I'm not sure if thats the best way to do it though.//insice main.cpp QSharedMemory _singular("myAppNameInstance"); if(_singular.attach(QSharedMemory::ReadOnly)){ //Instance Already running _singular.detach(); //Your MessageBox-code should go here return -42; }else{ //Program is not yet running. _singular.create(1); }@J.Hilk said in how to create Singleinstance application:
myAppNameInstance
QMessageBox::information(this,"Application is already running...","appname");
this keyword showing error,,,,invalid use of this
why you are retunring -42 what is the meaning...
thanks for your reply
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@J.Hilk said in how to create Singleinstance application:
myAppNameInstance
QMessageBox::information(this,"Application is already running...","appname");
this keyword showing error,,,,invalid use of this
why you are retunring -42 what is the meaning...
thanks for your reply
@Bharth
the main.cpp is not QObject based class, so you can't give QMessageBox this as parent.why you are retunring -42 what is the meanin
The Answer to the Ultimate Question of Death, The Universe, and Everything ...
The boring answer: an arbitrary return value I choose to identify the exit of the application.
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@Bharth said in how to create Singleinstance application:
it is showing file not found
Its not part of Qt. You need to download and add them to your project.
You can download from here .@Ratzz said in how to create Singleinstance application:
@Bharth said in how to create Singleinstance application:
it is showing file not found
Its not part of Qt. You need to download and add them to your project.
You can download from here .i downloaded but i dont know which i should add to my project
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@Ratzz said in how to create Singleinstance application:
@Bharth said in how to create Singleinstance application:
it is showing file not found
Its not part of Qt. You need to download and add them to your project.
You can download from here .i downloaded but i dont know which i should add to my project
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its working but not able to show qmessagebox,,,,
again if i click exe file it should open old one now its not opening@Bharth said in how to create Singleinstance application:
again if i click exe file it should open old one now its not opening
Do you mean you want to show a message if you try to start a second instance?
Then simply do it inside this block:if (instance.sendMessage("Wake up!")) { QMessageBox::information(nullptr, "Information", "Already running!", ...); return 0; }
