HELP!

[Peter P Stephensen]

Hi all,

I am working on a large project. And now I got a strange problem.
The following line have been in my code for weeks, and worked fine:

ch.graph(1).lpDataY         = varptr(expage(0,%W))

This morning it started to GPF!
expage(...) is a global array. ch is static.
If I add a msgbox everything is fine (the msgbox returns the correct value,
and there is no GPF):

msgbox format$(expage(0,%W))
ch.graph(1).lpDataY         = varptr(expage(0,%W))

Can anybody explain the fact that adding a msgbox solves the problem?
The project is very large. Have I hit some limit for global memory?
HELP!

If I change ch to local, there is no GPF.

Regards
Peter


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[This message has been edited by Peter P Stephensen (edited April 18, 2001).]

[Aldo Cavini]

Peter,

this is a problem I've already found, but I forgot to post to this forum - may be it is a known problem...

As I've understood it, UDTs CAN'T contain arrays. In your code graph is an UDT, and ch contains an array of graphs. I encountered problems also with simple LONG arrays inside an UDT... I hope one of the PowerBasic support guys tell something. At the moment I removed all the arrays form the UDTs; whenever I put arrays, I have random GPFs.

When you add the message box you change che compile code. As I stated above, GPFs are not always generated - they are random.

Aldo

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[This message has been edited by Aldo Cavini (edited April 18, 2001).]

[Lance Edmonds]

It does sound like you have encountered a known issue - arrays within a GLOBAL UDT can cause a GPF in obscure circumstances.

R&D have identified the problem and the next update to the compiler will include a fix for this problem.

Thanks!


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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Peter P Stephensen]

Lance,

My UDT is not global. It is static (and it have to be static).

Any solutions? This is very problematic for me! I have made a
chart-control that is used very extensively in my current project.
The chart is defined by the UDT:

TYPE CHART
    ...
    Graph(%MAX_GRAPHS-1) AS GRAPH
    ...
END TYPE

I could change it to:

TYPE CHART
    ...
    Graph1 AS GRAPH
    Graph2 AS GRAPH
    Graph3 AS GRAPH
    Graph4 AS GRAPH
    Graph5 AS GRAPH
    Graph6 AS GRAPH
    Graph7 AS GRAPH
    Graph8 AS GRAPH
    Graph9 AS GRAPH
    ...
END TYPE

but that would imply a lot of re-coding (and would be very ugly)
Any suggestions?

Regards
Peter

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[Aldo Cavini]

Peter,

You can't insert arrays into UDTs, but you can use arrays of UDTs. Divide your UDT in two parts, one if which is a simple array of GRAPH.

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[Peter Manders]

I've been troubled by the same bug, but managed to turn all UDTs to LOCALs.

Just an idea, could you try this:

LOCAL lptr AS LONG PTR

lptr = VARPTR(ch.graph(1).lpDataY)
@lptr = VARPTR(expage(0, %W))


Peter.


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[email protected]

[Florent Heyworth]

The way I get around it is to initialize storage for arrays
within UDTs outside of the UDT and then use DIM AT UDT.<address>
for convenience or address the mem address directly. If you did
it that way you might not have to restructure the code you're
using at present.

Cheers

Florent

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