重載方法

Question

部首代碼

/* 
* MngCommunication.h 
* 
* Created on: 26 gen 2017 
*  Author: Giuliano 
*/ 

#ifndef _MNGCOMMUNICATION_H_ 
#define _MNGCOMMUNICATION_H_ 

// ------------------------- N.B. MngCommunication is a Singleton  class!!! ---------------------------- 
#if (ARDUINO < 100) 
#include <WProgram.h> 
#else 
#include <Arduino.h> 
#endif 

class MngCommunication 
{ 
public: 
    static MngCommunication* getInstance(); 


    size_t LogLine(const __FlashStringHelper *ifsh, boolean end=false); 
    size_t LogLine(const String &str, boolean end=false); 
    size_t LogLine(const char str[], boolean end=false); 
    size_t LogLine(const unsigned char n, boolean end=false); 
    size_t LogLine(const int n, boolean end=false); 
    size_t LogLine(const unsigned int n, boolean end=false); 
    size_t LogLine(const long n, boolean end=false); 
    size_t LogLine(const unsigned long n, boolean end=false); 
    size_t LogLine(const double n, boolean end=false); 
    size_t LogLine(const Printable&str, boolean end=false); 

protected: 
    static MngCommunication* _inst_; 
    MngCommunication(); 
}; 

#endif /* MNGCOMMUNICATION_MNGCOMMUNICATION_H_ */ 

C++代碼

/* 
* MngCommunication.cpp 
* 
* Created on: 26 gen 2017 
*  Author: Giuliano 
*/ 

#include <string.h> 
#include "MngCommunication.h" 


MngCommunication* MngCommunication::_inst_ = NULL; 


MngCommunication::MngCommunication() 
{ 
    Serial.begin(57600); 

} 


MngCommunication* MngCommunication::getInstance() 
{ 
    if (_inst_ == NULL) _inst_ = new MngCommunication; 

    return _inst_; 
} 

//-------------------------------------------------------------------- 
//-------------------------------------------------------------------- 
// ------------------------ LOGGING FUNCTION ------------------------- 
//-------------------------------------------------------------------- 
//-------------------------------------------------------------------- 
boolean started=false; 

inline size_t startLine(void) 
{ 
    static char timebuffer[8]; 
    size_t sz = 0; 

    sprintf(timebuffer,"%08lu", millis()); 

    sz += Serial.print("#L-"); 
    sz += Serial.print(timebuffer); 
    sz += Serial.print("-"); 
    started=true; 
    return sz; 

} 

inline size_t endline(void) 
{ 
    started = false; 
    return Serial.write("\r\n"); 
} 

size_t MngCommunication::LogLine(const __FlashStringHelper *ifsh, boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
    sz += startLine(); 
    started = true; 
    } 

    sz += Serial.print(ifsh); 

    if (end) 
    { 
     sz += endline(); 
    } 


    return sz; 
} 

size_t MngCommunication::LogLine(const String &str, boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
     sz += startLine(); 
     started = true; 
    } 

    sz += Serial.print(str); 

    if (end) 
    { 
     sz += endline(); 
    } 

    return sz; 
} 


size_t MngCommunication::LogLine(const char str[], boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
     sz += startLine(); 
     started = true; 
    } 

    sz += Serial.print(str); 

    if (end) 
    { 
     sz += endline(); 
    } 

    return sz; 
} 





size_t MngCommunication::LogLine(const unsigned char n, boolean end) 
{ 
    return LogLine((unsigned long) n, end); 
} 


size_t MngCommunication::LogLine(const int n, boolean end) 
{ 
    return LogLine((long) n, end); 
} 

size_t MngCommunication::LogLine(const unsigned int n, boolean end) 
{ 
    return LogLine((unsigned long) n, end); 
} 


size_t MngCommunication::LogLine(const long n, boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
     sz += startLine(); 
     started = true; 
    } 

    sz += Serial.print(n); 

    if (end) 
    { 
     sz += endline(); 
    } 

    return sz; 
} 

size_t MngCommunication::LogLine(const unsigned long n, boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
     sz += startLine(); 
     started = true; 
    } 

    sz += Serial.print(n); 

    if (end) 
    { 
     sz += endline(); 
    } 

    return sz; 
} 



size_t MngCommunication::LogLine(const double n, boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
     sz += startLine(); 
     started = true; 
    } 

    sz += Serial.print(n); 

    if (end) 
    { 
     sz += endline(); 
    } 

    return sz; 
} 

size_t MngCommunication::LogLine(const Printable&str, boolean end) 
{ 
    size_t sz=0; 
    if (!started) 
    { 
     sz += startLine(); 
     started = true; 
    } 

    sz += Serial.print(str); 

    if (end) 
    { 
     sz += endline(); 
    } 

    return sz; 
} 

如果我使用​​函數字符串或字符緩衝器中，所有正常。例如： -

MngCommunication* Comm; 

Comm = MngCommunication::getInstance(); 
Comm.LogLine("this "); 
Comm.LogLine("is "); 
Comm.LogLine("a "); 
Comm.LogLine("test!!! ", true); 

奇怪的是號碼的呼叫： 如果我叫​​與數量例如爲：

MngCommunication* Comm; 

Comm = MngCommunication::getInstance(); 
Comm.LogLine(millis()); 

代碼執行就可以了。但第二個電話號碼或字符串，重新啓動Arduino。同樣，如果我先用字符串然後用數字調用函數。例如： -

所有這些緩衝區的

MngCommunication* Comm; 

Comm = MngCommunication::getInstance(); 
Comm.LogLine("this "); 
Comm.LogLine("is "); 
Comm.LogLine("a "); 
Comm.LogLine("test!!! "); 

Comm.LogLine("time= "); 
Comm.LogLine(mills()); 

Answer 1

static char timebuffer[8]; 
sprintf(timebuffer,"%08lu", millis()); 

首先是太小了。字符串終結符必須有空格（零字節），所以你有一個緩衝區溢出可能會導致各種奇怪的效果。

該緩衝區長度至少應爲11個字節。最大數量（32位）爲10個字節，字符串終止符爲1個字節。

我認爲mills()是一個錯字？

使用固定值時，您是否有同樣的問題，如Comm.LogLine(123);？

如果你叫什麼：

Comm.LogLine(123, true); 
Comm.LogLine(456);