[英]Call a function of VB DLL file from java using JNA
我是使用JNA的新手,我想做的就是在Java中使用vb DLL文件並從Java中調用函數。 我為此創建了一個簡單的Java代碼。
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);
}
}
當我運行此Java程序時,出現以下錯誤-
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代碼為
Public Function fn_Today(ival As Integer, ival2 As Integer)
Dim ret As Integer
ret = ival + ival2
End Function
我該如何解決這個問題?
我從依賴遍歷器得到以下輸出。
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.
如果您的VB DLL是C兼容的共享庫(如果您在其上運行Dependency Walker ,您將看到格式為XXX @ NNN的標簽),那么以下方法應該起作用。
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);
// ...
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.