About GUIDGEN.exe in Visual C++6.0

最新推荐文章于 2021-07-28 15:18:26 发布

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博客介绍阅读《com技术内幕》中GUID一节内容，提到GUIDGEN.exe调用Microsoft的COM库中CoCreateGuid函数，该函数会调用RPC函数UnidCreate。还介绍了MSDN中UuidCreate函数，包括参数、返回值等，以及不同系统下返回值情况和UUID唯一性问题。

今天阅读了《com技术内幕》中关于GUID一节，其中写道“GUIDGEN.exe其实调用了Microsoft 的COM库中的CoCreateGuid函数,CoCreateGuid将调用RPC函数UnidCreate”

in MSDN:

The UuidCreate function creates a new UUID.

#include <rpc.h>
RPC_STATUS RPC_ENTRY UuidCreate( 
  UUID *  Uuid  
);

Parameters

Uuid

Returns a pointer to the created UUID.

Return Values

Value	Meaning
RPC_S_OK	Success
RPC_S_UUID_LOCAL_ONLY	The UUID is guaranteed to be unique to this machine only.
RPC_S_UUID_NO_ADDRESS	Cannot get Ethernet or token-ring hardware address for this computer

Remarks

In Windows NT, versions 4.0 and later, Windows 95, DCOM release, and Windows 98, UuidCreate returns RPC_S_UUID_LOCAL_ONLY when the originating machine does not have an ethernet/token ring (IEEE 802.x) address. In this case, the generated UUID is a valid identifier, and is guaranteed to be unique among all UUIDs generated on the machine. However, the possibility exists that another machine without an ethernet/token ring address generated the identical UUID. Therefore you should never use this UUID to identify an object that is not strictly local to your machine. Machines with ethernet/token ring addresses generate UUIDs that are guaranteed to be globally unique.