Question

我使用JNA运行dll函数：

以下是与该方式对应的所有代码：

原生声明：

//how the method declared

H264_Login (char *sIP, unsigned short wPort, char *sUserName, char *sPassword, LP_DEVICEINFO lpDeviceInfo, int *error, ，SocketStyle socketTyle=TCPSOCKET); // where LP_DEVICEINFO is a struct

//how the struct declared
typedef struct _H264_DVR_DEVICEINFO
{
    SDK_SYSTEM_TIME tmBuildTime; // the "SDK_SYSTEM_TIME" is another struct
    char sSerialNumber[64];      
    int byChanNum;          
    unsigned int uiDeviceRunTime;  
    SDK_DeviceType deviceTye; // the "SDK_DeviceType" is a enum
}H264_DVR_DEVICEINFO,*LP_DEVICEINFO;

// this is how "SDK_SYSTEM_TIME" is defined
typedef struct SDK_SYSTEM_TIME{
    int  year;  
    int  month;  
    int  day;  
}SDK_SYSTEM_TIME;

// this is how "SDK_DeviceType" is defined
enum SDK_DeviceType
{
    SDK_DEVICE_TYPE_DVR,
    SDK_DEVICE_TYPE_MVR,
    SDK_DEVICE_TYPE_NR
};

// this is how "SocketStyle" is defined
enum SocketStyle
{
    TCPSOCKET=0,
    UDPSOCKET,
    SOCKETNR
};

以下是相应的Java映射：

public class Test implements StdCallLibrary {
public interface simpleDLL extends StdCallLibrary {

 long H264_Login(String sIP, short wPort, String sUserName, String sPassword,
 Structure DeviceDate, int error, int TCPSOCKET);
}
static
{
   System.loadLibrary("NetSdk");
}

// the struct implementation
    public static class DeviceDate extends Structure{

        public SDK_SYSTEM_TIME tmBuildTime;
        public String sSerialNumber;      
        public IntByReference byChanNum;              
        public IntByReference uiDeviceRunTime;  
        public IntByReference deviceTpye;    
        @Override
        protected List<Object> getFieldOrder() {
            List<Object> list = new ArrayList<>();
            list.add("tmBuildTime");
            list.add("sSerialNumber");
            list.add("byChanNum");
            list.add("uiDeviceRunTime");
            list.add("deviceTpye");
            return list;
        }    
    }

    public static class SDK_SYSTEM_TIME extends Structure{
        public IntByReference year;  
        public IntByReference month;  
        public IntByReference day;
        @Override
        protected List<Object> getFieldOrder() {
            List<Object> list = new ArrayList<>();
            list.add("year");
            list.add("month");
            list.add("day");
            return list;
        }
    }

// and then how I called it through the main function
public static void main(String args[]) throws FileNotFoundException{

 simpleDLL INSTANCE = (simpleDLL) Native.loadLibrary( ("NetSdk"), simpleDLL.class);
 DeviceDate dev = new DeviceDate() // where DeviceDate is a static class inherits com.sun.jna.Structure
 int err = (int) INSTANCE.H264_GetLastError();

 long result = INSTANCE.H264_Login("255.255.255.255", (short) 33333, "admin", "admin", dev, err, 0);

}
}

在运行应用程序时，Java崩溃了：

enter image description here

这是完整的问题签名：

问题签名：
  问题事件名称：APPCRASH
  应用程序名称：javaw.exe
  应用版本：7.0.600.19
  申请时间戳：536a95c6
  故障模块名称：jna3976113557901128571.dll
  故障模块版本：4.0.0.215
  故障模块时间戳：52d3949a
  例外代码：c0000005
  异常偏移：0000e3a2 OS   版本：6.1.7601.2.1.0.256.1
  地区ID：1033
  附加信息1：7bc2
  附加信息2：7bc24d73a5063367529b81d28aecc01c
  附加信息3：5bea
  附加信息4：5beaa1c0441c3adb156a170a61c93d19

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Answer 1

您的映射存在许多错误。您的结构应如下所示（IntByReference表示您将传递int的地址的地方，并且您不能将String替换为原始本地{{1数组）。请参阅the JNA mapping documentation以确保您了解本机类型如何映射到Java类型：

char

使用JNA调用dll函数时Java崩溃

1 个答案: