error C2872: ‘IServiceProvider’ : ambiguous symbol;

This is a very common compiler error with the C++ applications using the /clr switch. Here is the compiler output

错误 2 error C3699: “*”: 不能在类型“IServiceProvider”上使用此间接寻址 c:/program files/microsoft sdks/windows/v6.0a/include/servprov.h 96 ViComAPIBridgeDLL

错误 3 error C2371: “IServiceProvider”: 重定义；不同的基类型 c:/program files/microsoft sdks/windows/v6.0a/include/servprov.h 103 ViComAPIBridgeDLL

... ... ...

 

错误 8 error C2872: “IServiceProvider”: 不明确的符号 C:/Program Files/Microsoft SDKs/Windows/v6.0A/include/urlmon.h 5856 ViComAPIBridgeDLL

The problem is the

#include     
using namespace System;
 
directives. The first one is in conflict with the second.
To resolve the error, just swap their places like that
 
using namespace System;
#include