.idl与.odl的区别

A:

odl和.idl在com中的功能相同.
前者是ActiveX中的   后者是ATL中.

可在前者的文件中   用   #import   "XXXXX.idl "   的方式包含后者.   反过来没有试过.

 

 

B:

odl   ---对象描述语言
idl   ---接口描述语言
其实是一个功能就是在写法上有些不同，eg:
odl:
[
      uuid(3C591B20-1F13-101B-B826-00DD01103DE1),             //   LIBID_Lines.
      helpstring( "Lines   1.0   Type   Library "),
      lcid(0x09),
      version(1.0)
]
library   Lines
{
      importlib( "stdole.tlb ");

      [
            uuid(3C591B25-1F13-101B-B826-00DD01103DE1),     //   IID_Ipoint.
            helpstring( "Point   object. "),
            oleautomation,
            dual
      ]
      interface   IPoint   :   IDispatch
      {
            [propget,   helpstring( "Returns   and   sets   x   coordinate. ")]
            HRESULT   x([out,   retval]   int*   retval);  
            [propput,   helpstring( "Returns   and   sets   x   coordinate. ")]
            HRESULT   x([in]   int   Value);

            [propget,   helpstring( "Returns   and   sets   y   coordinate. ")]
            HRESULT   y([out,   retval]   int*   retval);  
            [propput,   helpstring( "Returns   and   sets   y   coordinate. ")]
            HRESULT   y([in]   int   Value);
      }
      [
            uuid(3C591B21-1F13-101B-B826-00DD01103DE1),       //   CLSID_Lines.
            helpstring( "Lines   Class "),
            appobject
      ]
      coclass   Lines
      {
            [default]   interface   IPoint;
                  interface   IDispatch;
      }
}
idl：

      [
            uuid(3C591B25-1F13-101B-B826-00DD01103DE1),     //   IID_Ipoint.
            helpstring( "Point   object. "),
            oleautomation,
            dual
      ]
      interface   IPoint   :   IDispatch
      {
            [propget,   helpstring( "Returns   and   sets   x   coordinate. ")]
            HRESULT   x([out,   retval]   int*   retval);  
            [propput,   helpstring( "Returns   and   sets   x   coordinate. ")]
            HRESULT   x([in]   int   Value);

            [propget,   helpstring( "Returns   and   sets   y   coordinate. ")]
            HRESULT   y([out,   retval]   int*   retval);  
            [propput,   helpstring( "Returns   and   sets   y   coordinate. ")]
            HRESULT   y([in]   int   Value);
      }
[
      uuid(3C591B20-1F13-101B-B826-00DD01103DE1),             //   LIBID_Lines.
      helpstring( "Lines   1.0   Type   Library "),
      lcid(0x09),
      version(1.0)
]
library   Lines
{
      importlib( "stdole32.tlb ");
      importlib( "stdole2.tlb ");
     
      [
            uuid(3C591B21-1F13-101B-B826-00DD01103DE1),       //   CLSID_Lines.
            helpstring( "Lines   Class "),
            appobject
      ]
      coclass   Lines
      {
            [default]   interface   IPoint;
                  interface   IDispatch;
      }
}

=====================================================================

.idl与.odl的区别

http://topic.csdn.net/t/20040427/17/3014084.html

1.
.odl和.idl在com中的功能相同. 
前者是ActiveX中的 后者是ATL中. 

可在前者的文件中 用 #import "XXXXX.idl" 的方式包含后者. 反过来没有试过. 
2.
When using IDL, you must declare the interfaces that will generate the C++ source files outside of the library declaration. For the ODL, this step is not necessary. Other than a few minor language differences, the IDL and ODL are identical in terms of syntax and organization. 
3.
ODL是Microsoft对IDL的扩展
4.
odl ---对象描述语言 
idl ---接口描述语言 
其实是一个功能就是在写法上有些不同，eg: 
odl: 
[ 
uuid(3C591B20-1F13-101B-B826-00DD01103DE1), // LIBID_Lines. 
helpstring("Lines 1.0 Type Library"), 
lcid(0x09), 
version(1.0) 
] 
library Lines 
{ 
importlib("stdole.tlb"); 

[ 
uuid(3C591B25-1F13-101B-B826-00DD01103DE1), // IID_Ipoint. 
helpstring("Point object."), 
oleautomation, 
dual 
] 
interface IPoint : IDispatch 
{ 
[propget, helpstring("Returns and sets x coordinate.")] 
HRESULT x([out, retval] int* retval); 
[propput, helpstring("Returns and sets x coordinate.")] 
HRESULT x([in] int Value); 

[propget, helpstring("Returns and sets y coordinate.")] 
HRESULT y([out, retval] int* retval); 
[propput, helpstring("Returns and sets y coordinate.")] 
HRESULT y([in] int Value); 
} 
[ 
uuid(3C591B21-1F13-101B-B826-00DD01103DE1), // CLSID_Lines. 
helpstring("Lines Class"), 
appobject 
] 
coclass Lines 
{ 
[default] interface IPoint; 
interface IDispatch; 
} 
} 
idl： 

[ 
uuid(3C591B25-1F13-101B-B826-00DD01103DE1), // IID_Ipoint. 
helpstring("Point object."), 
oleautomation, 
dual 
] 
interface IPoint : IDispatch 
{ 
[propget, helpstring("Returns and sets x coordinate.")] 
HRESULT x([out, retval] int* retval); 
[propput, helpstring("Returns and sets x coordinate.")] 
HRESULT x([in] int Value); 

[propget, helpstring("Returns and sets y coordinate.")] 
HRESULT y([out, retval] int* retval); 
[propput, helpstring("Returns and sets y coordinate.")] 
HRESULT y([in] int Value); 
} 
[ 
uuid(3C591B20-1F13-101B-B826-00DD01103DE1), // LIBID_Lines. 
helpstring("Lines 1.0 Type Library"), 
lcid(0x09), 
version(1.0) 
] 
library Lines 
{ 
importlib("stdole32.tlb"); 
importlib("stdole2.tlb"); 

[ 
uuid(3C591B21-1F13-101B-B826-00DD01103DE1), // CLSID_Lines. 
helpstring("Lines Class"), 
appobject 
] 
coclass Lines 
{ 
[default] interface IPoint; 
interface IDispatch; 
} 
}