On Aug 18, 2008, at 10:54 , Dave wrote:
Hi,I'm tring to create an NSString object from data contained within a file. The following code attempts to do this. The data is read from the file OK and all the size information etc. is OK.Here is a code snippet:myOSStatus = [self ReadUInt32LEFromPosition: myCurrentFilePosition + 28 IntPtr:&myBufferSize];myStringSize = (myBufferSize / 2) + 1; myStringBufferPtr = malloc(myBufferSize + 2); bzero(myStringBufferPtr,myBufferSize + 2);myOSStatus = [self ReadFromPosition: myCurrentFilePosition + 40 ForSize: myBufferSize BufferPtr:myStringBufferPtr];[thePropertiesInfoPtr->mNameString initWithCharacters: myStringBufferPtr length:myStringSize];---------------------thePropertiesInfoPtr pointer to a C Structure that contains the following member:NSString* mNameString;When the initWithCharacters method is called, the variables are setup as follows:myBufferSize = 54 myStringSize = 28 myStringBufferPtr is a pointer the following: 41 00 42 00 43 00 44 00 45 00 46 00 47 00 48 00 49 00 4A 00 4B 00 4C 00 4D 00 4D 00 4E 00 4F 00 50 00 51 00 52 00 53 00 54 00 55 00 56 00 57 00 58 00 59 00 5A 00 00 00But I get an Access Error when I run it. Could someone tell me what I am doing wrong and how I can correct it?
Did you allocate your string first?[[thePropertiesInfoPtr->mNameString alloc] initWithCharacters:myStringBufferPtr length:myStringSize];
If you haven't allocated your mNameString variable, chance are it points to 0x00 and that is why you
are getting an access violation...
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