无法通过从 ITLSSPProc.dll 调用 Native 方法打开端口 [英] Unable to open the port by calling Native method from ITLSSPProc.dll

问题描述

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这是来自 ITLSSPProc.dll 的本地方法

NOMANGLE int CCONV OpenSSPComPort (SSP_COMMAND * cmd);

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这里，SSP_COMMAND 是 C++ 中 ITLSSPProc.dll 中的结构语言.

struct SSP_COMMAND{无符号长波特率；无符号字符端口号；};

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所以，我必须使用 java 访问 OpenSSPComPort (SSP_COMMAND * cmd)JNI.这是我写的代码，

public class Main {公共接口 ITLSSPProc 扩展库 {ITLSSPProc INSTANCE = (ITLSSPProc) Native.loadLibrary((Platform.isWindows() ? "ITLSSPProc" : "simpleDLLWindowsPort"), ITLSSPProc.class);int OpenSSPComPort(指针参数)；int CloseSSPComPort();}public static void main(String[] args)throws IOException {ITLSSPProc sdll = ITLSSPProc.INSTANCE;内存 intMem = 新内存(10)；//分配空间intMem.setLong(0,9600);intMem.setString(1,"com7");if(sdll.OpenSSPComPort(intMem)==1){//使用 int 参数和结果调用函数System.out.println("连接");}别的{System.out.println("失败");}}}输出:失败

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端口号是我们正在使用的 COM7.所以，当我运行这个应用程序，当我手动传递波特率时，如用户所给手动，如果端口号正确，则必须在其上打印已连接"安慰.所以，有人知道我哪里出错了，我不明白实际问题在哪里..

解决方案

基本类型的 JNA 文档(long、char).

聚合类型的 JNA 文档(struct, struct *).

//tl;博士类 SSP_COMMAND 扩展结构 {公共 NativeLong BaudRate;公共字节端口号；}int OpenSSPComPort(SSP_COMMAND 参数)

This is native method from ITLSSPProc.dll

NOMANGLE int CCONV OpenSSPComPort (SSP_COMMAND * cmd);

Here, SSP_COMMAND is structure in ITLSSPProc.dll which is in C++ Language.

struct SSP_COMMAND
{
unsigned long BaudRate;
unsigned char PortNumber;
};

So, I have to access OpenSSPComPort (SSP_COMMAND * cmd) in java using JNI. Here is a code i have written,

public class Main {
    public interface ITLSSPProc extends Library {
     ITLSSPProc INSTANCE = (ITLSSPProc) Native.loadLibrary(
            (Platform.isWindows() ? "ITLSSPProc" : "simpleDLLWindowsPort"), ITLSSPProc.class);

        int OpenSSPComPort(Pointer param); 
        int CloseSSPComPort();                    
    }

    public static void main(String[] args)throws IOException {

     ITLSSPProc sdll = ITLSSPProc.INSTANCE;

        Memory intMem = new Memory(10); // allocating space
        intMem.setLong(0,9600);
        intMem.setString(1,"com7");        

        if(sdll.OpenSSPComPort(intMem)==1)
        {// calling function with int parameter&result
            System.out.println("connected");
        }
        else
        {
            System.out.println("failed");
        }
     }
}

Output : failed

Port number is COM7 on which we are working. So, when i run this application and as i passing baud rate as manually as given in user manual and if port number is correct it has to print "connected" on console. So, anybody know where i am going wrong, i dont understand where is actual problem..

解决方案

JNA documentation for basic types (long, char).

JNA documentation for aggregate types (struct, struct *).

// tl;dr
class SSP_COMMAND extends Structure {
    public NativeLong BaudRate;
    public byte PortNumber;
}

int OpenSSPComPort(SSP_COMMAND param)

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