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POUnsigned Long does not contain valid value
 

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  1. POUnsigned Long does not contain valid value
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    <p>My question is something I find very weird. In fact, I'm listing all the child processes of a given process.</p> <p>For this, I use : <a href="https://stackoverflow.com/questions/1009552/how-to-find-all-child-processes">How to find all child processes?</a> and RC's answer.</p> <p>But, I need an exit with unsigned long. And the solution give some string based on a <code>char[]</code></p> <p>If I want to get <code>unsigned long</code>, I need to modify the code to get only numeric value. The other case will not be correct.</p> <p>So I've put the <code>char</code> as <code>unsigned long</code>. Then, the <code>scanf</code> with <code>%ld</code> tags.</p> <p>But I'm getting crap ...</p> <p>Why does that not work ?</p> <p>EDIT : Code :</p> <pre><code>const char *name = "top"; char command[100]; unsigned long parentID; unsigned long processID; strcpy(command, "ps -C "); strcat(command, name); strcat(command, " --format '%P %p'"); FILE *fp = popen(command, "r"); if (fp == NULL) fprintf(stderr, "Error in reading PID child processes information !\n"); while(fscanf(fp, "%lu %lu", parentID, processID) != EOF) { printf("PID : %lu Parent : %lu \n", processID, parentID); } return processID; </code></pre> <p>With, <code>%s</code> and <code>char[256]</code>, this work !</p> <p>EDIT : Toughts</p> <p>I was thinking of two ways to do this:</p> <ul> <li>First, using <code>unsigned long</code> instead of <code>char[]</code>.</li> <li>Second, convert <code>char[]</code> to <code>unsigned long</code> after reading the file. However, I'd need to read it line by line. Is it possible with <code>popen</code> ?</li> </ul>
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    1. USCommunity
    1. USMike Telson
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    1. COYou have an error in your code.
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      1. POUnsigned Long does not contain valid value
      1. USPete Becker
    2. COObviously your code is wrong. Since you did not show your code you are making it needlessly hard. Word of advice: don't conceal the details.
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      1. POUnsigned Long does not contain valid value
      1. USDavid Heffernan
    3. COOkay, I'm adding it !
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      1. USMike Telson
 

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