CreateProcess in C closes console too fast

Question

I am using createProcess in C to open a command prompt to execute a jar . I have figured out all the kinks but for sake of debugging would like to somehow add something where the console just does not flash and is gone immediately.

What I am looking is for the jar to be executed and command window wait for a button press from me before it terminates.

This will only be for debugging and I will remove it before putting it out so as the console window does not hang and kill everything down the line.

    if (!CreateProcess(NULL,   // No module name (use command line)
        "java -jar testfile.jar",        // Command line
        NULL,           // Process handle not inheritable
        NULL,           // Thread handle not inheritable
        FALSE,          // Set handle inheritance to FALSE
        0,              // No creation flags
        NULL,           // Use parent's environment block
        NULL,           // Use parent's starting directory 
        &si,            // Pointer to STARTUPINFO structure
        &pi)           // Pointer to PROCESS_INFORMATION structure
        ){
            MessageBox(0, "test jar passed", "jar executed", 1);
            return 1;
        }
    else {
        printf("create process call to jar was sucessful");
        MessageBox(0,"jar failed", "Error Test", 1);
        return 0;
    }
}

I am not using it IDE but installing on a different system so I need to create dll. Cant use IDE feature's to stall command prompt there

Possible duplicate of [Why does my program's output flash and close in Windows?](http://stackoverflow.com/questions/1048975/why-does-my-programs-output-flash-and-close-in-windows) — Random Davis, Nov 15 '16 at 19:41
Try `java -jar testfile.jar & pause` instead of your command line.. — Eugene Sh., Nov 15 '16 at 19:55

score 1 · Accepted Answer · answered Nov 15 '16 at 19:38

1

To stop the blinking of console, you can use getch().

getch() waits for user to input character. If you don't have getch(), you can use other functions like getche(),getchar(). But unlike getch() it takes an extra newline.

I think it solves your problem.

answered Nov 15 '16 at 19:38

SkrewEverything

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I will try this – Praveen Nov 15 '16 at 19:40
`getch` is an MSVC function in `conio`. You can use the standard `getchar` - just hit `Enter` to complete the program execution. There is no *extra* `newline`. – Weather Vane Nov 15 '16 at 19:56
@SkrewEverything it did not work just flashed and quit – Praveen Nov 15 '16 at 20:37
@Praveen Where did you added `getch()`? In your code, is `return` meant for `main()`? If yes, you need to add `getch()` before your both the return statements. – SkrewEverything Nov 15 '16 at 20:41
@SkrewEverything I added it in else part before the message box. That is correct right ? – Praveen Nov 15 '16 at 20:44
@Praveen You should also add it in `if` part before `return`. – SkrewEverything Nov 15 '16 at 20:44
@SkrewEverything it goes in else block cause the command prompt executes sucessfully the issue is that java version has a mismatch. I verified it comes in else part – Praveen Nov 15 '16 at 20:55
@Praveen Can you edit your question with your whole updated code. Along with `main()`. – SkrewEverything Nov 15 '16 at 21:00
it is actually part of dll and quite hairy inside. I will try few things and get back if something works – Praveen Nov 15 '16 at 21:21
@Praveen I think you need to identify the line where the program gets terminated. Try to debug in the command line and write `getch()` before that line. Straight and simple. – SkrewEverything Nov 15 '16 at 21:31

CreateProcess in C closes console too fast

1 Answers1