Re: newbie question: how to read a string from a MemHandle?

[Gearoid Murphy]

I'm not sure what you are doing wrong.  As I see it to write the data to the 
handle you should be doing something like the following:

// global MemHandle
MemHandle h = NULL;
// Append data to whatever is already in handle
void WriteDataToHandle(Char *dataInP)
{
   Char *strP;
   Err err;
   UInt16 len = StrLen(dataInP);
   if (!h)
   {
        h = MemHandleNew(len+1);
        if (h)
        {
             strP = (Char *)MemHandleLock(h);
             if (strP)
             {
                   StrCopy(strP, dataInP);
                   MemHandleUnlock(h);
             }
        }
   }
   else
   {
         err = MemHandleResize(MemHandleSize(h)+(len+1));
         if (!err)
         {
              strP = (Char *)MemHandleLock(h);
              if (strP)
              {
                    // Append data
                    StrCat(strP, dataInP);
                    MemHandleUnlock(h);
              }
         }
   }
}
// Read data from handle
void ReadDataFromHandle()
{
    Char *strP = NULL;
    if (h)
    {
          strP = (Char *)MemHandleLock(h);
          if (strP)
          {
                DisplayStr(strP);
                MemHandleUnlock(h);
          }
    }
}
// Finally free handle
MemHandleFree(h);
Regards,

Ger

From: "blaman" <[EMAIL PROTECTED]>
Reply-To: "Palm Developer Forum" <[EMAIL PROTECTED]>
To: "Palm Developer Forum" <[EMAIL PROTECTED]>
Subject: Re: newbie question: how to read a string from a MemHandle?
Date: Thu, 7 Aug 2003 11:30:08 +0200
at first thanx for your reply. However, when i try to access strP my
programm crashes telling me it read memory from the memory manager data
structures. Any idea what i did wrong? i locked the handle to write it,
unlocked it, locked it again by
strP = (Char *)MemHandleLock(h);

accessed strP and it crashed.

"Gearoid Murphy" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
>
> Char *strP;
>
> strP = (Char *)MemHandleLock(h); // h is a MemHandle
>
>
> if (strP)
> {
> // Do stuff with strP
> }
>
> // Make sure to unlock MemHandle
> MemHandleUnlock(h);


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