你能帮我弄清楚为什么我会收到这些 2019 错误吗?我很确定所有文件都保存在正确的位置,而且我认为我对头文件使用了正确的约定?这是我的系统编程类(class)的实验室。
错误如下:
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall DLL::intDLL::intDLL(void)" (??0intDLL@DLL@@QAE@XZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall DLL::intDLL::~intDLL(void)" (??1intDLL@DLL@@QAE@XZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall DLL::intDLL::addFront(int)" (?addFront@intDLL@DLL@@QAEXH@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: int __thiscall DLL::intDLL::getFront(void)" (?getFront@intDLL@DLL@@QAEHXZ) referenced in function _main
1>c:\users\josh\documents\visual studio 2012\Projects\Lab10\Debug\Lab10.exe : fatal error LNK1120: 4 unresolved externals
intDLL.h文件:
#include <iostream>
using std::cout;
using std::endl;
class intDLL {
public:
intDLL();
intDLL(const intDLL &original);
~intDLL();
void addFront(int inValue);
void addBack(int inValue);
void setBack();
int getFront();
int getBack();
struct node {
int value;
node *next;
node *prev;
};
private:
node *front;
node *back;
};
intDLL.cpp
#include <iostream>
#include "intDLL.h"
using std::cout;
using std::endl;
intDLL::intDLL() {
front = 0;
back = 0;
}
void intDLL::setBack() {
node *tempNode = new node;
if(front == 0) {
return;
}
tempNode = front;
while(tempNode->back != 0) {
tempNode = tempNode->prev;
}
back = tempNode;
}
void intDLL::addFront(int inValue) {
if(front == 0) {
node *newFront = new node;
newFront->value = inValue;
newFront->next = 0;
newFront->prev = 0;
}
else {
node *newFront = new node;
newFront->value = inValue;
newFront->prev = front;
front->next = newFront;
newFront->next = 0;
front = newFront;
}
setBack();
}
void intDLL::addBack(int inValue) {
setBack();
node *newBack = new node;
newBack -> value = inValue;
back->prev = newBack;
newBack->next = back;
back = newBack;
}
int intDLL::getFront() {
return front->value;
}
int intDLL::getBack() {
return back->value;
}
主要内容:
#include <iostream>
#include "intDLL.h"
using std::cout;
using std::endl;
int main(int argc, char* argv[]) {
intDLL test = intDLL();
test.addFront(3);
test.addFront(4);
test.addFront(5);
std::cout << test.getFront() << endl;
return 0;
}
最佳答案
不确定真正的错误消息是什么,但似乎您还没有实现一些功能,例如
intDLL(const intDLL &original);
~intDLL();
检查您的函数定义以确保声明的每个函数都已定义。还要确保所有 cpp 文件都已编译和链接。
另一个错误是intDLL::node
has no back member
void intDLL::setBack() {
intDLL::node *tempNode = new node;
^^^^ node is defined in intDLL, you need provide scope
if(front == 0) {
return;
}
tempNode = front;
while(tempNode->back != 0) {
^^^ intDLL::node has no back member
tempNode = tempNode->prev;
}
back = tempNode;
}
查看此 SO链接。
关于c++ - LNK 2019/1120 Errors with my header/source file practice with 双链表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14844411/