Hi Regis
Thanx a lot for ur reply.
I had tried that earlier too after reading the docs.
e.g. What i did was
{
long a,b;
long *tptr = MemPtrNew(8); //space for 2 pointers.
*tptr = &a;
*(tptr +1)=&b;
userdatap = tptr;
PceNativeCall();
}
Then In my dll
i extracted the 2 pointers, byte swapped them and tried to access the
locations.
But no, it crashes.
Dont know the problem
Regards
Salil
Regis Nicolas wrote:
>
> You are facing a byte ordering problem.
>
> s1.v1 has been initialized by PalmOS 68K so the address is stored in big
> endian.
> PceNativeCall does not know anything about the pointer you pass to the
> native code and can't adjust pointers in it.
>
> On the Windows native side, you need to byte swap the pointer to put it in
> the windows native format before using it. You should be able to find 100 of
> functions to do that, including ntohl or steal one from Palm headers...
>
> WARNING: THIS IS NOT ENOUGH. You will also face to alignment/padding issues.
> The 68K compiler will not layout structures the same way than Windows
> compiler. The safest way is to manually put things in a memory area and pass
> a pointer to it to Windows, read manually knowing how you stored things. Do
> not rely on the compiler since they are different.
>
> Cordially,
> Regis.
>
> ------------------------------------------------------------------------
> Regis NICOLAS - Engineering Director, Montpellier Site
> Palm Computing Europe, a PalmSource, Inc. subsidiary
>
> When the finger points to the sky, the idiot looks at the finger.
>
> -----Original Message-----
> From: Salil Gokhale [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 13, 2002 8:31 AM
> To: Palm Developer Forum
> Subject: wierd problem
>
> Hello
>
> Has anyone tried native programming on simulator?
>
> Now we can pass a structure of parameters to the native code as
> userdata.
>
> I want to pass a number of buffers to the code.
> So I declare
>
> struct s1
> {
> long *v1;
> long *v2;
> };
>
> in my palm program.
>
> Also I have to access this structure in my dll, so i use this
> declaration.
> But if i try to access *v1 in dll then simulator crashes.
>
> If i declare it
> struct s1
> {
> long v1[5];
> long v2[1];
> };
>
> Then I can acess v1[0], v1[1] etc.
>
> Does that mean I have to declare all my buffers as arrays?
>
> But I have huge buffers so can be declared on stack.
>
> Can anyone help?
>
> Regards
> Salil
>
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