不能在C ++应用程序中导入dll [英] Cant import dll in C++ application

问题描述

我有一个名为 hecom32.dll 的DLL。我想在我的应用程序中使用这个。我收到以下内容：

I have a dll called hecom32.dll. I want to use this in my application. I acll the following:

#import "hecom32.dll"

我收到以下错误：

enter Error 1   error C1083: Cannot open type library file: 'c:\users\dvargo\documents\visual studio 2010\projects\johnny\johnny\hecom32.dll': Error loading type library/DLL.  c:\users\dvargo\documents\visual studio 2010\projects\johnny\johnny\johnny.cpp  6   1   Johnny

显然不能添加它。然而，我不确定它究竟是什么问题。有没有办法我可以分析文件，看看为什么它不能导入。有没有不同的方法来使用dll中的函数？

Obviously it cant add it. I am not sure however to determine what is wrong with it. Is there some way that I can analyze the file to see why it cant be imported. Is there a different way to use the functions in the dll?

我使用的是Visual Studio 2010

I am using Visual Studio 2010

推荐答案

如果hecom32.dll实现了COM服务器并将类型库嵌入资源，这将只能正常工作。您可以使用File + Open + File检查，选择dll。您将看到列出的资源，如果您打开节点，应该有一个标有TYPELIB的资源ID为1。

This will only work properly if hecom32.dll implements a COM server and has the type library embedded as a resource. You can check that with File + Open + File, select the dll. You'll see the resources listed, there should be one labeled "TYPELIB" with a resource ID of 1 if you open the node.

当然没有，错误信息说了多少嵌入类型库是一个惯例，它不是必需的。只要保持分开，因为.tlb文件也是可能的。当然，它可能根本不是一个COM服务器。您可以通过在dll上运行Dumpbin.exe / exports来看到。一个COM服务器至少有一个名为DllGetClassObject的导出。

Surely that's missing, the error message says as much. Embedding a type library is a convention, it isn't required. Just keeping it separate as a .tlb file is possible as well. And of course, it might not be a COM server at all. You can see that by running Dumpbin.exe /exports on the dll. A COM server has at least an export named "DllGetClassObject".

如果没有一个可以，那么最好联系DLL的所有者，并请求帮助如何正确使用它。通常需要一个带有导出函数和.lib文件的声明的.h文件，以便您可以链接。

If none of this pans out then you'd better contact the owner of the DLL and ask for help on how to use it properly. Which typically requires having a .h file with the declarations of the exported functions and a .lib file so you can link it.

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