Unexpected output

This is a discussion on Unexpected output within the Windows Programming forums, part of the Platform Specific Boards category; The following code is supposed to print out the names of all the sections in the specified exe (c:\linked list.exe ...

  1. #1
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    Unexpected output

    The following code is supposed to print out the names of all the sections in the specified exe (c:\linked list.exe in this case), but it produces some bizzare output. Can someone please help me figure out whats wrong??

    Code:
    #include<Windows.h>
    #include<stdio.h>
    #include<WinNT.h>
    
    int main()
    {
        FILE *fp; 
        int i;
    
        if((fp = fopen("c:\\Linked List.exe","rb"))==NULL)
            printf("unable to open");
    
    
        IMAGE_DOS_HEADER imdh;
        fread(&imdh,sizeof(imdh),1,fp);
    
    
        IMAGE_NT_HEADERS imnth;
        fread(&imnth,sizeof(imnth),1,fp);
    
        IMAGE_SECTION_HEADER *pimsh;
        pimsh = (IMAGE_SECTION_HEADER *)malloc(sizeof(IMAGE_SECTION_HEADER) * imnth.FileHeader.NumberOfSections);
    
        fread(pimsh,sizeof(IMAGE_SECTION_HEADER),imnth.FileHeader.NumberOfSections,fp);
    
        for(i=0;i<imnth.FileHeader.NumberOfSections;i++)
        {
            printf("%s\n",pimsh->Name);
            pimsh++;
        }
    
    }
    Last edited by juice; 03-09-2012 at 09:00 AM.

  2. #2
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    Don't typecast malloc - FAQ > Casting malloc - Cprogramming.com

    Always free() memory when you're done using it.

    And, post this question in the Windows board if you want specific answers to your question.

  3. #3
    - - - - - - - - oogabooga's Avatar
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    I would've answered this question except that the guy never says "thanks".
    The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss

  4. #4
    and the hat of wrongness Salem's Avatar
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    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  5. #5
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    Quote Originally Posted by oogabooga View Post
    I would've answered this question except that the guy never says "thanks".
    Hey.. come on.... I say thanks... and I wonder where I would have been without you people, and I am pretty much greatful to you all, especially you, laserlight, salem and commontater, so with sugar on top "THANK YOU ALL.... VERY MUCH!!"

  6. #6
    - - - - - - - - oogabooga's Avatar
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    Well, you've probably already figured this out, but you need to seek to the offset of the IMAGE_NT_HEADERS after reading the dos header. Something like this:
    Code:
        fseek(fp, imdh.e_lfanew, SEEK_SET);
    There's actually a very short program between the two that prints "This program cannot be run in DOS mode" if you try to run it in dos (which is not of course the same as running it from the console).
    The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss

  7. #7
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    Quote Originally Posted by oogabooga View Post
    Well, you've probably already figured this out
    Yes I have, but thanks anyways...

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