RegQueryValueEx Giving error 234

This is a discussion on RegQueryValueEx Giving error 234 within the C Programming forums, part of the General Programming Boards category; RegQueryValueEx(key,REG_DAYCNT,NULL,&type,(LPBYTE) &dayqry,&size) the first time i run this statement in my program i get a 234 (ERROR_MORE_DATA ) error . ...

  1. #1
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    RegQueryValueEx Giving error 234

    RegQueryValueEx(key,REG_DAYCNT,NULL,&type,(LPBYTE) &dayqry,&size)
    the first time i run this statement in my program i get a 234 (ERROR_MORE_DATA ) error . I looked it up but its about not having enough buffer memory. My concern is that when i run the same statement again it works perfectly. Also about the buffer not being big enough is kinda strange because im quering a dword -which should always be the same size i think-

    If someone can help , or know about this kind of problems please answer , thx.
    Last edited by Narcose; 07-14-2006 at 06:10 AM.

  2. #2
    Gawking at stupidity
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    Show us how you're declaring all the variables you're passing to the function.
    If you understand what you're doing, you're not learning anything.

  3. #3
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    Code:
    #define REG_LIB     HKEY_CURRENT_USER
    
    const char* REG_MAP     = "SOFTWARE\\Mirrosoft\\Autoshutdown";
    const char* REG_CNTDWN  = "CNTDWN";
    const char* REG_DAYCNT  = "DAYCNT";
    const char* REG_LIMIT   = "LIMIT";
    ....
    
    int getVartime(void)
    {
      HKEY key;
      DWORD result;
      int toReturn=0;
    
      if(testInitRun(DEFAULTTIME,DEFAULTTIME,curTime()));
    
      if(ERROR_SUCCESS != RegCreateKeyEx(REG_LIB,REG_MAP,0,NULL,REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL,&key,&result))
      {
        printf("Problem opening registry\n");
      }
      else
      {
        DWORD limitqry;
        DWORD cntqry;
        DWORD dayqry=0;
        DWORD type;
        DWORD size;
        int test;
        
        //Is it a new day??
        if(ERROR_SUCCESS != (test = RegQueryValueEx(key,REG_DAYCNT,NULL,&type,(LPBYTE)&dayqry,&size)))
        {
         printf("Problem opening registry\n %d\n",test);
         //RegQueryValueEx(key,REG_DAYCNT,NULL,&type,(LPBYTE)&dayqry,&size);
        }
      ...
    in the last if part it goes wrong , if i uncomment the second query , the second one works then correctly
    Last edited by Narcose; 07-14-2006 at 08:01 AM.

  4. #4
    Yes, my avatar is stolen anonytmouse's Avatar
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    The size argument is an in/out argument. So you need to initialise it:
    Code:
        DWORD size = sizeof(dayqry);
        int test;
        
        //Is it a new day??
        if(ERROR_SUCCESS != (test = RegQueryValueEx(key,REG_DAYCNT,NULL,&type,(LPBYTE)&dayqry,&size)))

  5. #5
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    that seems to be it ; thx

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