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Forum Update on Monday, May 27th 2025

Invalid parameter passed to C runtime function

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qtcreatorqstringlistruntime error
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  • JonBJ JonB

    @Lasith
    Check your calls to "std::alloc", i.e. everywhere you allocate memory. If you do inadvertently do something which boils down to, say:

    size_t size = (size_t) -1;
    std::alloc(size);
    

    then you will have memory problems :)

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    Lasith
    wrote on last edited by
    #6

    @JNBarchan I already have this issue :O

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    • mrjjM mrjj

      @Lasith

      Main memory.
      the new function can trow that error if you try to allocate and there is not enough free.

      http://en.cppreference.com/w/cpp/memory/new/bad_alloc

      L Offline
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      Lasith
      wrote on last edited by
      #7

      @mrjj so how can I increase the amount of memory?

      mrjjM 1 Reply Last reply
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      • L Lasith

        @mrjj so how can I increase the amount of memory?

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #8

        @Lasith
        Add more memory to the pc.
        But how much does the target currently have ?
        Did you check the how much app uses etc?

        Or find out if you are leaking memory and hence it runs dry.
        You have to find out what causes it using the debugger.
        Step through the code to find out where or in what context the
        error comes.

        You have not shown any code so its not possible to guess at.

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        • mrjjM mrjj

          @Lasith
          Add more memory to the pc.
          But how much does the target currently have ?
          Did you check the how much app uses etc?

          Or find out if you are leaking memory and hence it runs dry.
          You have to find out what causes it using the debugger.
          Step through the code to find out where or in what context the
          error comes.

          You have not shown any code so its not possible to guess at.

          L Offline
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          Lasith
          wrote on last edited by
          #9

          @mrjj Thanx how can I check the current memory usage? Using the task manager?

          mrjjM 1 Reply Last reply
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          • L Lasith

            @mrjj Thanx how can I check the current memory usage? Using the task manager?

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #10

            @Lasith
            Yes it can give a good hint. Start app and see how much it uses.

            there is also
            https://docs.microsoft.com/en-us/sysinternals/downloads/rammap

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            • mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #11

              Does error comes as soon as you start the app or
              does it take some time?

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              • mrjjM mrjj

                Does error comes as soon as you start the app or
                does it take some time?

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                Lasith
                wrote on last edited by Lasith
                #12

                @mrjj The error oocurs when I click a button which feeds a set of values to a QStringList through 2 for loops!

                mrjjM JonBJ 2 Replies Last reply
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                • L Lasith

                  @mrjj The error oocurs when I click a button which feeds a set of values to a QStringList through 2 for loops!

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #13

                  @Lasith
                  Ok, you might copy a lot around and run out of memory.
                  is it 32/64 bit app?
                  how much memory do you have?

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                  • mrjjM mrjj

                    @Lasith
                    Ok, you might copy a lot around and run out of memory.
                    is it 32/64 bit app?
                    how much memory do you have?

                    L Offline
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                    Lasith
                    wrote on last edited by
                    #14

                    @mrjj I can not check now :( Its in my office PC Now I am home I will notify you tomorrow! :)

                    mrjjM 1 Reply Last reply
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                    • L Lasith

                      @mrjj I can not check now :( Its in my office PC Now I am home I will notify you tomorrow! :)

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #15

                      @Lasith
                      Ok, if you copy lists, it might be the reason.
                      You should show the code.
                      Using all mem with strings, takes a lot of strings :)

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                      • L Lasith

                        @mrjj The error oocurs when I click a button which feeds a set of values to a QStringList through 2 for loops!

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by
                        #16

                        @Lasith said in Invalid parameter passed to C runtime function:

                        @mrjj The error oocurs when I click a button which feeds a set of values to a QStringList through 2 for loops!

                        And you're sure those 2 loops aren't actually unlimited? ;-) Better look at how many iterations they do :) You do have to do really quite a lot of iterations to run out of memory!

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                        • JonBJ JonB

                          @Lasith said in Invalid parameter passed to C runtime function:

                          @mrjj The error oocurs when I click a button which feeds a set of values to a QStringList through 2 for loops!

                          And you're sure those 2 loops aren't actually unlimited? ;-) Better look at how many iterations they do :) You do have to do really quite a lot of iterations to run out of memory!

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                          Lasith
                          wrote on last edited by Lasith
                          #17

                          @JNBarchan No the upper limits of the conditions is finite! Any way I will check and see! Plus if its an infinite loop the error message is different as I remember!

                          JonBJ 1 Reply Last reply
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                          • L Lasith

                            @JNBarchan No the upper limits of the conditions is finite! Any way I will check and see! Plus if its an infinite loop the error message is different as I remember!

                            JonBJ Offline
                            JonBJ Offline
                            JonB
                            wrote on last edited by JonB
                            #18

                            @Lasith said in Invalid parameter passed to C runtime function:

                            @JNBarchan No the upper limits of the conditions is finite!

                            This is good to know. But there are finite numbers and then there are other finite numbers. Numbers like, say, 0x7FFFFFFF (2 billion?) as the limit in each loop (I'm understanding they are nested?) will cause a lot of iterations... ;-)

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                            • JonBJ JonB

                              @Lasith said in Invalid parameter passed to C runtime function:

                              @JNBarchan No the upper limits of the conditions is finite!

                              This is good to know. But there are finite numbers and then there are other finite numbers. Numbers like, say, 0x7FFFFFFF (2 billion?) as the limit in each loop (I'm understanding they are nested?) will cause a lot of iterations... ;-)

                              L Offline
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                              Lasith
                              wrote on last edited by
                              #19

                              @JNBarchan yeah they are nested for loops!

                              1 Reply Last reply
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