COM组件 C4772 错误解决

#import tlb 文件如果存在继承式的依赖，编译时会导致C4772 错误，有时发现即使正确引用了，仍然是C4772，此时可以尝试把所有的tlb文件放到工程目录下。也许可以解决。

#import referenced a type from a missing type library; '__missing_type__' used as a placeholder

A type library was referenced with the #import directive. However, the type library contained a reference to another type library that was not referenced with #import . This other .tlb file was not found by the compiler.

This warning is, by default, issued as an error. C4772 can not be suppressed with /W0.

Given the following type libraries on disk created from the following two file (compiled with midl.exe):

/* c4772a.idl */

[uuid("f87070ba-c6d9-405c-a8e4-8cd9ca25c12b")]

library C4772aLib

{

   [uuid("f87070ba-c6d9-405c-a8e4-8cd9ca25c100")]

   enum E_C4772a

   {

      one, two, three

   };

};

/* c4772b.idl */

// C4772a.tlb is available when c4772b.tlb is built

[uuid("f87070ba-c6d9-405c-a8e4-8cd9ca25c12d")]

library C4772bLib

{

   importlib ("c4772a.tlb");

   [uuid("f87070ba-c6d9-405c-a8e4-8cd9ca25c12e")]

   struct S_C4772b

   {

      enum E_C4772a e;

   };

};

The following sample generates C4772:

// C4772.cpp

// assumes that C4772a.tlb is not available to the compiler

// #import "C4772a.tlb"

#import "C4772b.tlb"   // C4772 uncomment previous line to resolve

                       // and make sure c4772a.tlb is on disk