interop

  • Thread starter Thread starter ZhangZQ
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ZhangZQ

I created a ocx that has a method,

[id(5), helpstring("·½·¨Test1")] void Test1(VARIANT* a);

the implementation is
void Cocx030820Ctrl::Test1(VARIANT* a)
{
try
{
//see here
AFX_MANAGE_STATE(AfxGetStaticModuleState());

ST_PRINT* m;
//get data
m=(ST_PRINT*)a;
CString s;
s.Format("%d,%d,%s,%c",m->i,m->l,m->s,m->mSTRU1.c);
MessageBox(s);
}
catch(...)
{
MessageBox("f");
}
}

and the ST_PRINT definition is

#ifndef IOPRINT
#define IOPRINT
typedef struct
{
unsigned char a[11];
unsigned char b[9];
char c;
}STRU1;

typedef struct
{
unsigned char Tran[11];
unsigned char TermId[9];
STRU1 mSTRU1;
char c;
int i;
long l;
double d;
char s[10];
}ST_PRINT;

#endif

My question is how to call the Test1 method in C#
//ST_PRINT
object obj=new object();
how can I set the field value of obj.
axocx0308201.Test1(ref b3);




Thank you very much!
 
the implementation is
void Cocx030820Ctrl::Test1(VARIANT* a)
{
try
{
//see here
AFX_MANAGE_STATE(AfxGetStaticModuleState());

ST_PRINT* m;
//get data
m=(ST_PRINT*)a;
Click to expand...

These kinds of hacks might work in C++, but not in C#. Why do you make
the parameter type a VARIANT* when it really isn't?



Mattias
 
Dear Mattias,

It is necessary, because that OCX is the third party product, I have to use
it but can not change it, is it possible to do that?

Thank you very much!


ZhangZQ
 
It is necessary, because that OCX is the third party product, I have to use
it but can not change it, is it possible to do that?
Click to expand...

Only if you change the managed definition of the method to take an
IntPtr or a ST_PRINT& parameter instead.



Mattias
 
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