[英]JNA couldn't find the specified procedure in dll file through java
I am trying to access dll procedure through java but my java method is unable to find the procedure. 我正在尝试通过Java访问dll过程,但是我的java方法无法找到该过程。 The dll file is loaded successfully but the the procedure from C# code named Login I can't call.
该dll文件已成功加载,但无法调用C#代码中名为Login的过程。
Below is the def of Procedure in ADHelper.dll: 下面是ADHelper.dll中Procedure的定义:
public static ADHelper.LoginResult Login(string UserName, string Password)
{
if (!ADHelper.IsUserValid(UserName, Password))
return ADHelper.LoginResult.LOGIN_USER_DOESNT_EXIST;
DirectoryEntry user = ADHelper.GetUser(UserName);
if (user == null)
return ADHelper.LoginResult.LOGIN_USER_DOESNT_EXIST;
int userAccountControl = Convert.ToInt32(RuntimeHelpers.GetObjectValue(user.Properties["userAccountControl"][0]));
user.Close();
return !ADHelper.IsAccountActive(userAccountControl) ? ADHelper.LoginResult.LOGIN_USER_ACCOUNT_INACTIVE : ADHelper.LoginResult.LOGIN_OK;
}
The dll file name is ADHelper.dll. dll文件名为ADHelper.dll。 The LoginResult is enum type:
LoginResult是枚举类型:
public enum LoginResult
{
LOGIN_OK,
LOGIN_USER_DOESNT_EXIST,
LOGIN_USER_ACCOUNT_INACTIVE,
}
Below is my java program to normally call the procedure: 下面是我的Java程序通常调用的过程:
package dllTest;
import com.sun.jna.*;
public class DllTester {
public interface ADHelper extends Library {
public final int LOGIN_OK=1;
public final int LOGIN_USER_DOESNT_EXIST=2;
public final int LOGIN_USER_ACCOUNT_INACTIVE=3;
public int Login(String user, String pass);
}
public static void main(String[] args) {
ADHelper objADH = (ADHelper) Native.loadLibrary("ADHelper", ADHelper.class);
System.out.println(objADH.getClass().getDeclaredMethods());
objADH.Login("ashish", "asdas");
}
}
Now, it is gives following error: 现在,它给出以下错误:
Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'Login': The specified procedure could not be found.
线程“主”中的异常java.lang.UnsatisfiedLinkError:查找函数“ Login”时出错:找不到指定的过程。
Do tell me if any more details are needed. 告诉我是否需要更多详细信息。
The solution is based upon this methodolgy: 该解决方案基于以下方法:
enums/constants handling in java for dll. 枚举/常量在Java中为dll处理。
NOTE: I have included the dll file in system32 for testing purpose, as for easy access too. 注意:我已在system32中包含dll文件以进行测试,以方便访问。 the dll file is loading but the Login function is not calling.
dll文件正在加载,但Login函数未调用。
The output of SOP line in java is : Java中SOP行的输出为:
[Ljava.lang.reflect.Method;@145d068
The problem here is that your DLL is a .Net DLL, which is not a native DLL. 这里的问题是您的DLL是.Net DLL,而不是本机DLL。 JNA only loads and understands native DLLs, that is, DLLs built to function outside the .Net framework.
JNA仅加载和理解本机DLL,即为在.Net框架之外运行而构建的DLL。
What this means is that you need a different glue between Java and .Net. 这意味着您需要在Java和.Net之间使用不同的粘合剂。 I have successfully worked with Jni4net and IKVM , and there are a few others, you might want to look at those.
我已经成功地使用了Jni4net和IKVM ,还有其他一些,您可能想看看。
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