如何在Java中使用JNA lib使用C＃函数 [英] How to use C# function in Java using JNA lib
问题描述
我花了很多时间尝试在我的Java应用程序中使用C＃函数但没有成功...
我用C＃写了下面的lib：
I've spent many hours trying to use a C# function inside my Java Application but had no success... I wrote the following lib in C#:
public class Converter
{
public Converter()
{
}
public bool ConvertHtmlToPdf(String directoryPath)
{
//DO SOMETHING
}
}
这个dll调用另一个dll来进行一些操作，但是当我编译它时，我可以在我的Realse文件夹中找到Dlls，一切似乎都没问题，所以我使用32位选项，64位和任意编译它CPU选项只是为了确保它不是我的问题。
This dll calls another dll to make some operations but when I compile it I can find Dlls in my Realse folder and everything seems to be ok, so I compiled it using 32bit option, 64bit, and Any CPU option just to make sure that it's not my issue.
使用依赖性Walker 在32位和任何CPU选项中，它表示无法找到IESHIMS.DLL，并显示此消息：
Analizing my dll files with Dependency Walker in 32 bit and Any CPU option it says that IESHIMS.DLL can't be found, and show this message:
警告：找不到至少一个延迟加载依赖模块。
警告：由于延迟加载相关模块中缺少导出功能，至少有一个模块具有未解析的导入。
Warning: At least one delay-load dependency module was not found. Warning: At least one module has an unresolved import due to a missing export function in a delay-load dependent module.
不会出现64位文件，但是我找不到我的ConvertHtmlToPdf函数。
It doesn't occur with the 64bit file, nevertheless I can't find my ConvertHtmlToPdf function.
由于我不知道它是否相关，我的第二步是在Java代码中。
As I don't know if it is relevant or not, my second step was in the Java Code.
要加载我的库我做：
System.setProperty("jna.library.path", "C:\\Program Files (x86)\\Facilit\\Target App\\lib");
和：
public interface IConversorLibrary extends Library {
IConversorLibrary INSTANCE = (IConversorLibrary) Native.loadLibrary("converter", IConversorLibrary.class);
void ConvertHtmlToPdf(String directoryPath);
}
（lib似乎加载成功，因为如果我尝试删除dll文件与我的应用程序运行它说，无法删除因为它在使用）
和最后：
(The lib seems to be load successful, cause if I try to delete dll file with my application running it says that can't be deleted cause it's in using) and finally:
IConversorLibrary.INSTANCE.ConvertHtmlToPdf(directoryPath);
但结果并非如我所愿：
java.lang.UnsatisfiedLinkError: Error looking up function 'ConvertHtmlToPdf': Could not find the specified procedure.
我不知道我做错了什么，我尝过很多教程和很多东西，但任何似乎都有效，任何帮助都非常感激。
I don't know what I'm doing wrong, I've tried many tutorials and many things, but anything seems to work, any help is really appreciated.
推荐答案
正如technomage所说：
As said by technomage:
JNA可以从使用C链接的DLL加载。一个C＃类没有通过
默认支持任何一种C链接。 C ++支持与
externC符号的C链接。
JNA can load from DLLs that use C linkage. A C# class does not by default support any kind of C linkage. C++ supports C linkage with the extern "C" notation.
这篇文章展示了一种使C＃DLLs方法像C风格的DLL一样可调用的方法，遗憾的是它非常复杂。
This article shows a way to make C# DLLs methods callable like C-style DLL, unfortunately it's a quite complex.
这篇关于如何在Java中使用JNA lib使用C＃函数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！
