On Mon, 8 Nov 1999, Holger Klawitter wrote:
> > void AdjustFieldFont(Word fldID, int width) {
> > FormPtr form;
> > FieldPtr fldP;
> >
> > form = FrmGetActiveForm();
> > fldP = FrmGetObjectPtr(form, FrmGetObjectIndex(form, fldID));
> > if(FldGetTextLength(fldP)>width) {
> > FldSetFont(fldP, stdFont);
> > }
> > else {
> > FldSetFont(fldP, largeFont);
> > }
> > }
>
> > What can cause the error: "app has just read from memory location
> > zero, NULL" when changing font size. Both fields have characters
> > inserted from global arrays of characters.
>
> Normally this error occurs when the text handle is not properly
> set. You might want to check with FldGetTextHandle before getting
> the text length. The reason for one field having a handle and the
> other not might be that the first one had the focus.
This function is called each time I insert a character. So,
FldGetTextLength() is executed each time I insert a character,
it is only when the FldSetFont() is executed that I get the error.
FldSetFont() is what is generating the error and it only happens,
if the field has single line attribute set to TRUE. If I change
it to FALSE, it works without error.
Mike
>
> Hope this helps,
> Holger Klawitter
> --
> Holger Klawitter +49 (0)251 484 0637
> [EMAIL PROTECTED] http://www.klawitter.de/
>
>
>
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