本文主要是介绍ActiveX .idl与.odl的区别，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
.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;
}
}
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