C＃调用C ++ DLL得到EntryPointNotFoundException [英] C# call a C++ dll get EntryPointNotFoundException
问题描述
我是gaven一个C ++ DLL文件， LIB 文件和一个头文件。我需要从我的C＃应用程序调用它们。
I was gaven a C++ dll file, a lib file and a header file. I need to call them from my C# application.
头文件看起来是这样的：
header file looks like this:
class Clog ;
class EXPORT_MACRO NB_DPSM
{
private:
string sFileNameToAnalyze ;
Clog *pLog ;
void write2log(string text) ;
public:
NB_DPSM(void);
~NB_DPSM(void);
void setFileNameToAnalyze(string FileNameToAnalyze) ;
int WriteGenbenchData(string& message) ;
};
在我的C＃code，我有那些code：
In my C# code, I have those code:
internal ReturnStatus correctDataDLL(string rawDataFileName)
{
if (rawDataFileName == null || rawDataFileName.Length <= 0)
{
return ReturnStatus.Return_CannotFindFile;
}
else
{
setFileNameToAnalyze(rawDataFileName);
}
string msg = "";
int returnVal = WriteGenbenchData(ref msg);
return ReturnStatus.Return_Success;
}
[DllImport("..\\..\\thirdParty\\cogs\\NB_DPSM.dll")]
public static extern void setFileNameToAnalyze(string fileName);
[DllImport("..\\..\\thirdParty\\cogs\\NB_DPSM.dll")]
public static extern int WriteGenbenchData(ref string message);
我 EntryPointNotFoundException 在 setFileNameToAnalyze（rawDataFileName）; 语句
几个问题：
-
我需要补充的是
LIB文件到我的C＃项目的地方？怎么样？
do I need to add that
libfile into somewhere of my C# project? how?
我需要的头文件添加到我的C＃项目？怎么样？ （无编译错误现在）
do I need to add the header file into my C# project? how? (no compile error for now)
我想删除这些.. \\ .. \\ \\第三方齿\\硬code路径。如何呢？
I would like to remove those "..\\..\\thirdParty\\cogs\\" hardcode path. how to this?
如何让乘坐的 EntryPointNotFoundException ？
感谢
推荐答案
您不必包含任何头文件或C＃项目的lib文件。这些文件是没用的，你啦。
You don't need to include either the header file or the lib file in your C# project. These files are useless to you anyway.
您购买的EntryPointNotFound异常的原因是你对那些进入点提供不正确的名称。当你编译一个C ++项目，编译器中加入有关参数的其他信息和返回类型轧液的名称。 （您可以使用DUMPBIN.EXE实用看到这些入口点。）
The reason you are getting an EntryPointNotFound exception is that you've provided incorrect names for those entry points. When you compile a C++ project, the compiler mangles the names by adding additional information about parameters and return types. (You can use the dumpbin.exe utility to see these entry points.)
真正的问题，然而，就是你的DLL evidentally包含一个C ++类。 setFileNameToAnalyze和WriteGenbenchData是该类的实例方法，而不是静态函数。你不能叫他们不先创建NB_DPSM类的一个实例。
The real problem, however, is that your DLL evidentally contains a C++ class. "setFileNameToAnalyze" and "WriteGenbenchData" are instance methods of that class, not static functions. You can't call them without creating an instance of the NB_DPSM class first.
这也许可以仅使用P / Invoke来办，但在这一点上，我认为这是可能更多的麻烦比它的价值。您应该创建一个托管C ++类库来包装旧的DLL来代替。
It might be possible to do that using only P/Invoke, but at this point I think it's likely more trouble than it's worth. You should create a managed C++ class library to wrap the old DLL instead.
至于你的问题的一部分，（3），只是删除的路径，并确保NB_DPSM.dll驻留在同一bin目录作为输出文件的结果。
As to part (3) of your question, just remove the paths and make sure that NB_DPSM.dll resides in the same bin directory as the result of your output files.
这篇关于C＃调用C ++ DLL得到EntryPointNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
