c++ - 编译错误Arduino C++对象库

Question

我正在为蓝牙通信编写一个 C++ Arduino 库。我实现了一种机制，以便注册一个自定义函数，以便在某个字节来自 BT 连接时执行。实际上是一种 Java Hashmap。一切正常，但是当我尝试在构造函数中注册库对象的方法时，出现了一些我无法理解的编译错误。我在 Ubuntu 16.04 LTS 64 位上使用 Arduino IDE 1.6.9。该板是一个 Arduino UNO。在代码下方， header :

#ifndef BlueHartwin_H
#define BlueHartwin_H

    #include <SoftwareSerial.h>
    #include <Streaming.h>;
    #include <Arduino.h>

    #define START_TX 254
    #define STOP_TX 255

    typedef void (* CmdFuncPtr) (); // this is a typedef to command functions


    class BlueHartwin {

    public:
        BlueHartwin(byte bluetoothTx,byte bluetoothRx,long baudRate);
        ~BlueHartwin();
        boolean registerCmd(byte id,CmdFuncPtr cmdFuncPtr);
        boolean unRegisterCmd(byte id,CmdFuncPtr cmdFuncPtr);
        boolean runCmd(byte id);
        void setDataLength(byte dataLength);
        byte getDataLength();
        byte getIncomingByte();
        void txSwitchOff(void);
        void txSwitchOn(void);
        bool isTx();
        boolean available();
        boolean read();
        void write(byte data,boolean endLine);


    private:

        CmdFuncPtr setOfCmds[255];
        byte mDataLength;
        bool tx;
        byte incomingByte;
    };

    #endif

正文:

#include "BlueHartwin.h";

/*
 * Reserved command IDs:
 * 14,
 * 15
*/


SoftwareSerial bluetooth(7,8);


BlueHartwin::BlueHartwin(byte bluetoothTx,byte bluetoothRx,long baudRate){
    bluetooth = SoftwareSerial(bluetoothTx,bluetoothRx);
    bluetooth.begin(baudRate);
    for (int i=0;i<=255;i++) {
        setOfCmds[i]=NULL;
    }
    tx=false;

    registerCmd(14,&txSwitchOff);
    registerCmd(15,&txSwitchOn);
}

BlueHartwin::~BlueHartwin(){

}

boolean BlueHartwin::registerCmd(byte id,CmdFuncPtr cmdFuncPtr){
    if (setOfCmds[id]==NULL) {
        setOfCmds[id]=cmdFuncPtr;   
        return true;
    } else return false;
}

boolean BlueHartwin::unRegisterCmd(byte id,CmdFuncPtr cmdFuncPtr){
    setOfCmds[id]=NULL; 
    return true;

}


boolean BlueHartwin::runCmd(byte id){
    if (setOfCmds[id]!=NULL) {
        setOfCmds[id]();
        return true;
    } else return false;
}


void BlueHartwin::setDataLength(byte dataLength) {
    mDataLength=dataLength;
}

byte BlueHartwin::getDataLength(){
    return mDataLength;
}

byte BlueHartwin::getIncomingByte(){
    return incomingByte;
}

boolean BlueHartwin::isTx(){
    return tx;
}

void BlueHartwin::txSwitchOff(void){
  tx=false;
  Serial<<"now tx is "<<tx<<endl;
}

void BlueHartwin::txSwitchOn(void){
  tx=true;
  Serial<<"now tx is "<<tx<<endl;
}

boolean BlueHartwin::available(){
    return bluetooth.available();
}

boolean BlueHartwin::read(){

    if (bluetooth.available()>0)
        {
         incomingByte=bluetooth.read();
         Serial << "Incoming byte " << incomingByte<<endl;
         return runCmd(incomingByte);
        }
    return false;
}


void BlueHartwin::write(byte data,boolean endLine){
    if (tx) {
        if (endLine) bluetooth << data << endl;
        else bluetooth<<data;
    }
}

错误:

/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp: In constructor 'BlueHartwin::BlueHartwin(byte, byte, long int)':
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:21:18: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&BlueHartwin::txSwitchOff' [-fpermissive]
  registerCmd(14,&txSwitchOff);
                  ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:21:29: error: no matching function for call to 'BlueHartwin::registerCmd(int, void (BlueHartwin::*)())'
  registerCmd(14,&txSwitchOff);
                             ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:21:29: note: candidate is:
In file included from /home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:1:0:
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note: boolean BlueHartwin::registerCmd(byte, CmdFuncPtr)
  boolean registerCmd(byte id,CmdFuncPtr cmdFuncPtr);
          ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note:   no known conversion for argument 2 from 'void (BlueHartwin::*)()' to 'CmdFuncPtr {aka void (*)()}'
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:22:18: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&BlueHartwin::txSwitchOn' [-fpermissive]
  registerCmd(15,&txSwitchOn);
                  ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:22:28: error: no matching function for call to 'BlueHartwin::registerCmd(int, void (BlueHartwin::*)())'
  registerCmd(15,&txSwitchOn);
                            ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:22:28: note: candidate is:
In file included from /home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:1:0:
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note: boolean BlueHartwin::registerCmd(byte, CmdFuncPtr)
  boolean registerCmd(byte id,CmdFuncPtr cmdFuncPtr);
          ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note:   no known conversion for argument 2 from 'void (BlueHartwin::*)()' to 'CmdFuncPtr {aka void (*)()}'
exit status 1
Errore durante la compilazione per la scheda Arduino/Genuino Uno.

如果我在构造函数中更改行:

registerCmd(14,&txSwitchOff);
registerCmd(15,&txSwitchOn);

到

registerCmd(14,&BlueHartwin::txSwitchOff);
registerCmd(15,&BlueHartwin::txSwitchOn);

我遇到了这个错误:

/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp: In constructor 'BlueHartwin::BlueHartwin(byte, byte, long int)':
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:21:42: error: no matching function for call to 'BlueHartwin::registerCmd(int, void (BlueHartwin::*)())'
  registerCmd(14,&BlueHartwin::txSwitchOff);
                                          ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:21:42: note: candidate is:
In file included from /home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:1:0:
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note: boolean BlueHartwin::registerCmd(byte, CmdFuncPtr)
  boolean registerCmd(byte id,CmdFuncPtr cmdFuncPtr);
          ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note:   no known conversion for argument 2 from 'void (BlueHartwin::*)()' to 'CmdFuncPtr {aka void (*)()}'
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:22:41: error: no matching function for call to 'BlueHartwin::registerCmd(int, void (BlueHartwin::*)())'
  registerCmd(15,&BlueHartwin::txSwitchOn);
                                         ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:22:41: note: candidate is:
In file included from /home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.cpp:1:0:
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note: boolean BlueHartwin::registerCmd(byte, CmdFuncPtr)
  boolean registerCmd(byte id,CmdFuncPtr cmdFuncPtr);
          ^
/home/paolo/ARDUINO/arduino-1.6.9/libraries/BlueHartwin/BlueHartwin.h:19:10: note:   no known conversion for argument 2 from 'void (BlueHartwin::*)()' to 'CmdFuncPtr {aka void (*)()}'
exit status 1
Errore durante la compilazione per la scheda Arduino/Genuino Uno.

在此先感谢您的帮助!

Answer 1

伙计，你的 txSwitchOn/Off 方法是实例方法 - 它们需要 this 才能正常工作。

另一方面，您的 CmdFuncPtr 是一个不依赖于任何东西的函数的定义。

---

假定 Arduino 一次可以处理多少这样的设备(由您的库支持)？

如果它是单个的，则将所有内容声明为静态的，将构造函数重命名为“static void init()”，将析构函数重命名为“static void disconnect()”，等等。你的函数(都是静态的)。