Java 调用Dll文件

使用Jna技术

jna下载地址：github.com/java-native…

调用方法

import com.sun.jna.Library;
import com.sun.jna.Native;

public interface XXX extends Library {
    XXX INSTANCE = (XXX) Native.load("dll的name", XXX.class);  
    
    /**
    * value: 方法的返回类型
    * funcation: DLL中的方法,名称保持一致
    * parameters：方法传入的参数(参数需要和C中进行相互对应)
    */
    value function(parameters)
}

XX a = XX.INSTANCE;
value = a.function

Java和C++的类型之间的相互转换：

Native Type	Size	Java Type	Common Windows Types
char	8-bit integer	byte	BYTE, TCHAR
short	16-bit integer	short	WORD
wchar_t	16/32-bit character	char	TCHAR
int	32-bit integer	int	DWORD
int	boolean value	boolean	BOOL
long	32/64-bit integer	NativeLong	LONG
long long	64-bit integer	long	__int64
float	32-bit FP	float
double	64-bit FP	double
char*	C string	String	LPCSTR
void*	pointer	Pointer	LPVOID, HANDLE, LPXXX

常见的报错

1. Exception in thread "main" java.lang.UnsatisfiedLinkError: %1 is not a valid Win32 application. 一般是jdk版本的位数和dll的位数不匹配导致的，比如64位jdk调用32位的dll.