所以现在我遇到了这个问题：
"Unresolved external symbol "public: void__thiscall canoid::getinput(void)" (?Getinput@Canoid@@QAEXXZ) referenced in function _main" in the programming language c++
我需要帮助解决这个问题，我试图寻找如何在线解决此问题，但没有找到任何问题。错误代码为LNK2019这是编码语言，对不起，代码:(混乱

Canoid.h

#include <iostream>
#include <math.h>
#include <vector>
#include <string>
#include <algorithm>
#include <conio.h>
using namespace std;
string error_output = "";
bool AllowToInit = true;
class Canoid {
public:
// Init(); is used for Used for initlizazing the Canoid, InitDone checks if initiated
void Init();
bool InitDone = false;
// Input- Gets the Input of the Input
string Input;
// stops Init(); Funciton
void Uninitiated();
// Gets ASCIITABLE (127)
void GetAsciiTable();
// Definition of key input;
// A-Z
#define CANOID_A 65;
#define CANOID_B 66;
#define CANOID_C 67;
#define CANOID_D 68;
#define CANOID_E 69;
#define CANOID_F 70;
#define CANOID_G 71;
#define CANOID_H 72;
#define CANOID_I 73;
#define CANOID_J 74;
#define CANOID_K 75;
#define CANOID_L 76;
#define CANOID_M 77;
#define CANOID_N 78;
#define CANOID_O 79;
#define CANOID_P 80;
#define CANOID_Q 81;
#define CANOID_R 82;
#define CANOID_S 83;
#define CANOID_T 84;
#define CANOID_U 85;
#define CANOID_V 86;
#define CANOID_W 87;
#define CANOID_X 88;
#define CANOID_Y 89;
#define CANOID_Z 90;
//END OF A-Z
// Lowercase Alphabets [a-z]
#define CANOID_a 97
#define CANOID_b 98
#define CANOID_c 99
#define CANOID_d 100
#define CANOID_e 101
#define CANOID_f 102
#define CANOID_g 103
#define CANOID_h 104
#define CANOID_i 105 
#define CANOID_j 106
#define CANOID_k 107
#define CANOID_l 108
#define CANOID_m 109
#define CANOID_n 110
#define CANOID_o 111
#define CANOID_p 112
#define CANOID_q 113
#define CANOID_r 114
#define CANOID_s 115
#define CANOID_t 116
#define CANOID_u 117
#define CANOID_v 118
#define CANOID_w 119
#define CANOID_x 120
#define CANOID_y 121
#define CANOID_z 122
// End Lowercase Alphabets [a-z]
#define CANOID_ESCAPE 27  // escape key

// End of Definition of CANOID Input
// Key Func
int key();
// Input
void GetInput();
// CANOID_GET_ERROR is used for getting error.
#define CANOID_GET_ERROR error_output;
};
// Functions
void Canoid::Init() {
if (AllowToInit == true) {
InitDone = true;
}
else {
error_output = "AllowToInit has been disabled.";
}
}
void Canoid::Uninitiated() {
exit(-0);
}
void Canoid::GetAsciiTable() {
if (InitDone == true) {
// Get's the ASCII Table.
for (int AsciiTableNo = 0; AsciiTableNo< 127; AsciiTableNo++) {
cout << char(AsciiTableNo);
}
}
else {
error_output = "you have not initiated the program yet.";
}
}
// key values
int Canoid::key() {
if (InitDone == true) {
char key = _getch();
return key;
}
else {
error_output = "you have not initiated the program yet.";
return 0;
}
}

Canoid_UserInput.h

#include "Canoid.h"
Canoid canoid;
void Canoid::GetInput() {
if (canoid.InitDone == true) {
// caps
if (canoid.key() == CANOID_a) {
canoid.Input = canoid.Input + "a";
}
if (canoid.key() == CANOID_b) {
canoid.Input = canoid.Input + "b";
}if (canoid.key() == CANOID_c) {
canoid.Input = canoid.Input + "c";
}if (canoid.key() == CANOID_d) {
canoid.Input = canoid.Input + "d";
}if (canoid.key() == CANOID_e) {
canoid.Input = canoid.Input + "e";
}if (canoid.key() == CANOID_f) {
canoid.Input = canoid.Input + "f";
}if (canoid.key() == CANOID_g) {
canoid.Input = canoid.Input + "g";
}if (canoid.key() == CANOID_h) {
canoid.Input = canoid.Input + "h";
}if (canoid.key() == CANOID_i) {
canoid.Input = canoid.Input + "i";
}if (canoid.key() == CANOID_j) {
canoid.Input = canoid.Input + "j";
}if (canoid.key() == CANOID_k) {
canoid.Input = canoid.Input + "k";
}if (canoid.key() == CANOID_l) {
canoid.Input = canoid.Input + "l";
}if (canoid.key() == CANOID_m) {
canoid.Input = canoid.Input + "m";
}if (canoid.key() == CANOID_n) {
canoid.Input = canoid.Input + "n";
}if (canoid.key() == CANOID_o) {
canoid.Input = canoid.Input + "o";
}if (canoid.key() == CANOID_p) {
canoid.Input = canoid.Input + "p";
}if (canoid.key() == CANOID_q) {
canoid.Input = canoid.Input + "q";
}if (canoid.key() == CANOID_r) {
canoid.Input = canoid.Input + "r";
}if (canoid.key() == CANOID_s) {
canoid.Input = canoid.Input + "s";
}if (canoid.key() == CANOID_t) {
canoid.Input = canoid.Input + "t";
}if (canoid.key() == CANOID_u) {
canoid.Input = canoid.Input + "u";
}if (canoid.key() == CANOID_v) {
canoid.Input = canoid.Input + "v";
}if (canoid.key() == CANOID_w) {
canoid.Input = canoid.Input + "w";
}if (canoid.key() == CANOID_x) {
canoid.Input = canoid.Input + "x";
}if (canoid.key() == CANOID_y) {
canoid.Input = canoid.Input + "y";
}if (canoid.key() == CANOID_z) {
canoid.Input = canoid.Input + "z";
}
}
else {
error_output = "you have not initiated the program yet.";
}
}

资料来源.cpp

#include <iostream>
#include "Canoid.h"
using namespace std;
int value = 0;
int main() {
Canoid canoid;
canoid.Init();
cout << CANOID_GET_ERROR;

//=================================
while (true) {
//if (canoid.key() == CANOID_ESCAPE) {
//  value++;
//  cout << " Pause " << endl;
//  cout << " Press ESC to resume" << endl;
//}
//if (canoid.key() == CANOID_ESCAPE && value == 1) {
//  system("cls");
//  value = 0;
//}
canoid.GetInput();
cout << canoid.Input;
}
//=================================
}

这是程序的输出

1>------ Build started: Project: Canoid, Configuration: Debug Win32 ------
1>Source.obj : error LNK2019: unresolved external symbol "public: void __thiscall Canoid::GetInput(void)" (?GetInput@Canoid@@QAEXXZ) referenced in function _main
1>C:UsersNAMEsourcereposCanoidDebugCanoid.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "Canoid.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========