QtCore4.dll error when starting the program from cd

[high_flyer]

QProcess *proc = new QProcess(NULL); // no parents cause i dont want to bind those two applications, i just want to start it without parent....

QProcess *proc = new QProcess(NULL); // no parents cause i dont want to bind those two applications, i just want to start it without parent....

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It looks like you are using a local pointer 'proc'.
At the end of the function it will be destroyed - no wonder the application crashes.

You have to make your QProcess pointer a member, and it has to live as long as the process you are running with it lives.

[circass]

I think you are wrong about that, i dont want to kill real exe when the other one killed. And pointers are not destroyed if they have no parents and if you dont delete them or directly the pointer. That is the deal here. I want to start the program and close the other one. And as i said it is working if i start the autorun.exe in my harddisk.
AutoRun.exe -> copies the files and Starts ApplicaitonRunner.exe
ApplicationRunner.exe -> starts MyProgram.exe
MyProgram.exe -> Crashes when qtcore4.dll is tried to be load...
Thanks.

[high_flyer]

And pointers are not destroyed if they have no parents and if you dont delete them or directly the pointer.

LOL.
You better read some basic C++ tutorials about pointers.
The only thing that does not get destroyed in a case of a local pointer is the allocated memory.
The pointer variable gets destroyed,and in fact causes a memory leak,which will be cleaned up only when the allocating process is destroyed.


This might not be the cause of your crash, but since you didn't post much code, its hard to say.

[circass]

And pointers are not destroyed if they have no parents and if you dont delete them or directly the pointer.

Hehehe i think you have to read those tutorials(espacially QtAssistan -> QProcess -> Constructor parameters and their meanings) or what i wrote but anyway thanx for your tries. Better if you try to write some basic examples what we are talking about. You can see what i m talking about clearly with that way.

[high_flyer]

Hehehe i think you have to read those tutorials(espacially QtAssistan -> QProcess -> Constructor parameters and their meanings)

I think that after about 8 year of Qt programming I got the idea.
It has nothing to do with QProcess but C++ basics, see below:

void MyClass::foo()
{
  QProcess *pProcess = new QProcess();
  .....
 
}

void MyClass::foo()
{
  QProcess *pProcess = new QProcess();
  .....

}

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At the end of foo() the pointer pProcess is destroyed. period.
And you can't access that instance of QProcess anymore (unless you saved the address in another pointer that lives beyond the scope of foo() such as a member variable.)

It is well possible that your crash has nothing to do with QProcess, but with some out of scope pointer, but without seeing your code its hard to say.

[borisbn]

circass, did you deployed a CRT of your compiler (vc_redist for MSVC) ?

[circass]

Ok,
i found the problem. This is what i got:::

If you are trying to open an external program and if that program uses some extra files for loading then you have to set the working path of that program.

QProcess->setWorkingDirectory(Program'sDirectory);

The real problem was a xml file that must be load at the begining of the program. when it couldnt load it gave that rediciolus error QtCore4.dll thing. I was searching for a wrong thing from the begining... Well i solved my problem.
Thank you for all your efforts.

Circass