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KennyT
Joined: 02 Aug 2005
Posts: 317
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 Posted: Thu Jan 12, 2012 1:25 pm Post subject: Pointers, pointers, pointers! |
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Got a wierd situation. I have a routine (QW_SetAdr defined in a separate DLL) that displays a value on the screen. When it is passed a variable defined through a pointer to a structure variable, it behaves inconsistently. So, to give a coding example:
In the following, CPH is defined in a module and populated elsewhere
| Code: | TYPE(PHRES), POINTER :: PH
.
.
PH=>CPH
.
.
CALL QW_SetADR (IS, IFLD, PH%Avalue) |
Fails to update the field on the screen cleanly.
But…
| Code: | TYPE(PHRES), POINTER :: PH
.
.
PH=>CPH
.
.
AVALUE = PH%Avalue
CALL QW_SetADR (IS, IFLD, Avalue) |
…Works
And…
| Code: | TYPE(PHRES) :: PH
.
.
PH=CPH
.
.
CALL QW_SetADR (IS, IFLD, PH%Avalue) |
…Works as well
If I try stepping through the code under /debug, it all works OK, but if I just run the app, regardless of whether the relevant code is compiled under /debug or not, sometimes it works, sometimes it doesn't.
Any ideas?
TIA
K |
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KennyT
Joined: 02 Aug 2005
Posts: 317
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| Posted: Thu Jan 12, 2012 2:49 pm Post subject: |
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OK, sussed it! The routine that displays the value is using the LOC of the variable and was testing for that being .le.0, and, of course, under 64-bit OS, the 4-byte addresses can and do go negative!
K |
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