riccohb
asked on
EAccessViolation
When referring to another unit in a Delphi 4 app I get the following error...
Project SysAdmin.exe raised exception class EAccessViolation with message 'Access violation at address 0046C332 in module 'SysAdmin.exe'. Read of address 000002F0...'
This happens when a unit called 'frmBoxName' refers to a unit called 'frmDeleter' like this...
with frmDeleter do
if gridDeleter.RowCount > 0 then
btnOK.Enabled := True
else
btnOK.Enabled := False;
Release;
The error occurs on the first 'if' statement. If I comment out this entire procedure the same error occurs next time I refer to frmDeleter.
In fact, I get the error whenever any of my forms refer to any of the others...
Both frmDeleter and frmBoxName are included in each other's relevant uses clause.
I'm sure this is really easy, because I'm sure I've done it before successfully and I've done something really daft this time...
Project SysAdmin.exe raised exception class EAccessViolation with message 'Access violation at address 0046C332 in module 'SysAdmin.exe'. Read of address 000002F0...'
This happens when a unit called 'frmBoxName' refers to a unit called 'frmDeleter' like this...
with frmDeleter do
if gridDeleter.RowCount > 0 then
btnOK.Enabled := True
else
btnOK.Enabled := False;
Release;
The error occurs on the first 'if' statement. If I comment out this entire procedure the same error occurs next time I refer to frmDeleter.
In fact, I get the error whenever any of my forms refer to any of the others...
Both frmDeleter and frmBoxName are included in each other's relevant uses clause.
I'm sure this is really easy, because I'm sure I've done it before successfully and I've done something really daft this time...
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Or maybe the form is freed ...
Rgds,
Frodo
Rgds,
Frodo
ASKER
There you go - I told you it was a stupid mistake. I've just added
var frmDeleter: Tfrmdeleter;
to that procedure and it worked perfectly. Thanks.
var frmDeleter: Tfrmdeleter;
to that procedure and it worked perfectly. Thanks.
I think fva is right on. Either you are trying to work with forms that have not been created, or with forms that haved already been freed/destroyed.
DOH!
Regards, Madshi.