[英]Call a function of VB DLL file from java using JNA
I am new to using JNA.In all what i want to do is use the vb DLL file in java & call the functions from java. 我是使用JNA的新手,我想做的就是在Java中使用vb DLL文件并从Java中调用函数。 I created a simple java code for this.
我为此创建了一个简单的Java代码。
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;
public class Main
{
public interface test extends Library
{
void fn_Today(int a,int b);
}
public static void main(String[] args)
{
test INSTANCE = (test) Native.loadLibrary(
(Platform.isWindows() ? "test" : "test"), test.class);
int a = 1;
int b=2;
INSTANCE .fn_Today(a,b);
}
}
When i run this java program i am getting following error- 当我运行此Java程序时,出现以下错误-
Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'fn_Today': The specified procedure could not be found.
at com.sun.jna.Function.<init>(Function.java:179)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:344)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:324)
at com.sun.jna.Library$Handler.invoke(Library.java:203)
at com.sun.proxy.$Proxy0.fn_Today(Unknown Source)
at mwrobel.jna.Main.main(Main.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Dll code is as DLL代码为
Public Function fn_Today(ival As Integer, ival2 As Integer)
Dim ret As Integer
ret = ival + ival2
End Function
How can i solved this issue? 我该如何解决这个问题?
i got the following output from dependency walker. 我从依赖遍历器得到以下输出。
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.
If your VB DLL is a C-compatible shared library (if you run Dependency Walker on it you'll see labels of the form XXX@NNN), then the following should work. 如果您的VB DLL是C兼容的共享库(如果您在其上运行Dependency Walker ,您将看到格式为XXX @ NNN的标签),那么以下方法应该起作用。
import com.sun.jna.win32.StdCallFunctionMapper;
import com.sun.jna.win32.StdCallLibrary;
public class Main
{
public interface TestLibrary extends StdCallLibrary
{
void fn_Today(int a,int b);
}
public static void main(String[] args)
{
Map options = new HashMap() {
{ put(Library.OPTION_FUNCTION_MAPPER, new StdCallFunctionMapper()) }
};
TestLibrary INSTANCE = (TestLibrary) Native.loadLibrary("test", TestLibrary.class, options);
// ...
}
}
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