On Wed, Aug 13, 2003 at 05:24:44PM -0700, Steve K wrote:
> In that case, I'm curious what is wrong with this code that runs fine on the
> palm handheld but is rejected by the emulator with the following error on
> line marked with *:
>
> Project (1.0) called SysFatalAlert with the message: "Field.c, Line: 7221,
> NULL parameter".
>
> Is there something wrong with setting fldAttr to NULL before calling
> FldGetAttributes?
>
> void foo()
> {
> // Verify field attributes
> FieldAttrType* fldAttr = NULL;
> FldGetAttributes(fldP, fldAttr);
I'm actually amazed that it runs fine on the palm handheld. I guess the
handhelds are more forgiving about writing data to memory location
0. That code is bad bad bad.
Try
FieldAttrType fldAttr;
FldGetAttributes(fldP, &fldAttr);
Or, if you insist on passing a real pointer to FldGetAttributes:
FieldAttrType* fldAttr;
fldAttr = MemPtrNew(sizeof(FieldAttrType));
FldGetAttributes(fldP, fldAttr);
...
MemPtrFree(fldAttr);
Hint: don't do it this way, but it might give you some insight on what
was wrong with your code.
Also, find a good book on C that explains pass by reference via pointers
vs. pass by value.
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Dave Carrigan
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