Description
The IPBX_Marshaler interface is used to invoke remote methods and convert PowerBuilder data formats to the user's communication protocol. A marshaler extension is a PowerBuilder extension that acts as the bridge between PowerBuilder and other components, such as CORBA objects etc.
Methods
|
Method |
Description |
|---|---|
|
Destroys an instance of an object inherited from the IPBX_Marshaler structure |
|
|
Returns the handle of the PBX that contains the native class |
|
|
Used in PowerBuilder marshaler native classes to call remote methods |
Description
Use the Destroy method to destroy instances of objects inherited from the IPBX_Marshaler structure.
Syntax
Destroy( )
Return value
None.
Examples
This code destroys the current instance of the SampleMarshaler structure:
void SampleMarshaler::Destroy()
{
delete this;
}Usage
You must implement this method in the marshaler native class after creating an instance of a marshaler structure and invoking remote methods.
See also
Description
Returns the handle of the PBX that contains the native class. This method is required to allow the PowerBuilder VM to determine which PBXs can be unloaded.
Syntax
GetModuleHandle( )
Return value
pbulong
Examples
This code in the implementation of a marshaler class returns the handle of the PBX:
extern pbulong thisModuleHandle;
pbulong SampleMarshaler::GetModuleHandle()
{
return thisModuleHandle;
}The handle is set in the main module:
pbulong thisModuleHandle = 0;
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
thisModuleHandle = (pbulong)hModule;
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}Usage
You must implement this method in the marshaler native class.
See also
Description
Used in PowerBuilder marshaler native classes to call remote methods.
Syntax
InvokeRemoteMethod(IPB_Session *session, pbproxyobject obj, LPCTSTR methodDesc, PBCallInfo *ci)
|
Argument |
Description |
|---|---|
|
session |
This IPB session |
|
obj |
The proxy object for the remote object |
|
methodDesc |
An arbitrary string stored as an alias name for the remote method in the proxy, for example: function int foo(int a) alias "This is a method in remote BizTalk" |
|
ci |
The parameters and return value setting for the call |
Return value
PBXRESULT.PBX_OK if the call succeeded.
Examples
This example shows a header file for a sample marshaler class:
#include "sampleinclude.h"
#include <pbext.h>
class SampleMarshaler : public IPBX_Marshaler
{
private:
string d_mystring;
long d_mylong;
private:
void myMethod(string arg1);
public:
SampleMarshaler(
string myString,
long mylong
);
~SampleMarshaler();
virtual PBXRESULT InvokeRemoteMethod
(
IPB_Session* session,
pbproxyObject obj,
LPCTSTR methodDesc,
PBCallInfo* ci
);
virtual pbulong
GetModuleHandle();
virtual void Destroy();
};The associated C++ implementation file contains code like this:
PBXRESULT SampleMarshaler::InvokeRemoteMethod
(
IPB_Session* session,
pbproxyObject obj,
LPCTSTR methodDesc,
PBCallInfo* ci
)
{
// method invocation
}Usage
You must implement this method in the marshaler native class.
See also
