Structure of COM Development

In this example, the struct is transmitted as a parameter between COM and C #. The struct has two parameters: comid and comname,

Initialize the struct in C # and pass it to com. After COM is processed, it is returned to C #.

First open the firstcom Project (http://www.cnblogs.com/xiaokang088/archive/2011/05/16/2047376.html) in the previous example, follow these steps.

1. Open the firstcom. IDL file and add a struct as follows:

Struct firststruct

{

Int comid;

[String] wchar *
Comname;

};

2. In the above example, there is an interface definition, as shown below, add a method (Red is new)

[

Object,

UUID (645ee65a-27f6-406b-b2e8-7da-660fe0e8 ),

Dual,

Nonextensible,

Pointer_default (unique)

]

Interface ifirstclass: idispatch {

[ID (1)] hresult add ([in]
Long para1, [in] Long para2, [out, retval] long *
Result );

[ID (2)]
Hresult teststruct (struct firststruct * result );

};

3. Open the header file firstclass. H, find the public modifier, and add a method (red indicates the addition), as shown below:

Public:

Stdmethod (ADD) (long
Para1, long para2, long * result );

Stdmethod (teststruct) (struct
Firststruct * result );

};

4. Open the source file firstclass. cpp and see the method added in the previous example. below it, add the struct processing method (red indicates the addition)

// Firstclass. cpp: Implementation of cmycomserver

 

# Include "stdafx. H"

# Include "firstclass. H"

# Include <string>

 

// Firstclass

 

Stdmethodimp
Cfirstclass: add (long para1, long para2,
Long * result)

{

// Todo: add the implementation code here

* Result =
Para1 + para2;

Return s_ OK;

}

 

 

Stdmethodimp
Cfirstclass: teststruct (struct firststruct * result)

{

//
Todo: add the implementation code here

Result-> comid + = 10;

Result-> comname =
_ T ("docom ");

Return
S_ OK;

}

 

5. compile the project, open the WPF project, and add the following code to test it:

// Initialize the struct firstcomlib. firststruct = new firstcomlib. firststruct () {comname = "managemethod", comid = 100}; // test the firstclass struct. teststruct (ref firststruct); debug. writeline ("comid:" + firststruct. comid); debug. writeline ("comname:" + firststruct. comname );

The output is as follows:

Comid: 110

Comname: docom

 

Success ~!