On Fri, 19 Oct 2001, gordingin wrote:
> typedef struct tag_DebugMessage
> {
> Char szTime[timeStringLength];
> Char szDate[dateStringLength];
> CharPtr pszMessage;
>
> } DEBUGMESSAGE, *pDEBUGMESSAGE;
>
> Here is my code that saves it.....
> Err iErr = DmWrite(vpszID, offsetof(DEBUGMESSAGE,szTime), &pszData->szTime,
>StrLen(pszData->szTime));
> iErr = DmWrite(vpszID, offsetof(DEBUGMESSAGE,szDate), &pszData->szDate,
>StrLen(pszData->szDate));
> iErr = DmWrite(vpszID, offsetof(DEBUGMESSAGE,pszMessage), pszData->pszMessage,
>StrLen(pszData->pszMessage));
>
> Here is my code that reads it...
> pDEBUGMESSAGE pszLocalData;
> pszLocalData = (pDEBUGMESSAGE)MemHandleLock(hRecord);
>
> Basically it doesnt' work. The first 2 vars, time and date are filled
> but the pszMessage isn't. Am I doing this correctly? I have found
> samples and followed them but it seems not to work. Are there any
> working examples?
You're dereferencing the string pointer on the way out (good, otherwise
you'd be saving the pointer, which wouldn't be valid when you got it back)
but not re-referencing it on the way in. Either you should read the string
out into some memory and point pszMessage to that memory, or use a struct
like
typedef struct tag_DebugMessage
{
Char szTime[timeStringLength];
Char szDate[dateStringLength];
Char pszMessage[1];
} DEBUGMESSAGE, *pDEBUGMESSAGE;
and allocate the string on the end of the struct so you don't need to
dereference/re-reference it. Also, you're going to want to either save the
length of the string somewhere or be sure to save the null terminator as
well.
Jake
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