尝试使用Code :: Blocks编译第二个模块时出现C ++链接器错误 [英] C++ linker error when trying to compile a second module using Code::Blocks

问题描述

所以我试图学习C ++，而且我已经使用头文件。他们真的对我毫无意义。我尝试了很多这种组合，但迄今为止没有任何工作：

Main.cpp：

  #includetest.h
 
 int main（）{
 testClass Player1; 
返回0; 
 
  

test.h：

  #ifndef TEST_H_INCLUDED 
 #define TEST_H_INCLUDED 
 class testClass {
 private：
 int health; 
 public：
 testClass（）; 
〜testClass（）; 
 int getHealth（）; 
 void setHealth（int inH）; 
}; 
 #endif // TEST_H_INCLUDED 
  

test.cpp：

  #includetest.h
 
 testClass :: testClass（）{health = 100; } 
 testClass ::〜testClass（）{} 
 
 int testClass :: getHealth（）{return（health）; } 
 void testClass :: setHealth（int inH）{health = inH; } 
  

我想要做的事很简单，但头文件的工作方式只是使对我来说毫无意义。代码块在构建时返回以下内容：

obj\Debug\main.o（.text + 0x131）|| In function 主：|
* voip * \test\main.cpp
| 6 |未定义引用 testClass :: testClass（）'|
obj\Debug\main.o（.text + 0x13c）： voip \test\main.cpp | 7 |对testClass ::〜testClass（）的未定义引用|
|| ===构建完成：2个错误，0个警告=== |

我很感激任何帮助。或者，如果你有一个体面的教程，这也可以（我已经使用Google的大部分教程都没有帮助）

解决方案

Code :: Blocks不知道它必须编译 test.cpp 并产生一个目标文件 test.o （这样后者可以与 main.o 连接在一起生成可执行文件）。您必须将 test.cpp 添加到您的项目中。

在Code :: Blocks中，转到<$ c在菜单中选择$ c> Project>添加文件并选择你的 test.cpp 文件。确保Release和Debug复选框都被选中。

然后 Build->重建。

编辑：

这里有一个提示可以帮助您了解IDE在遮罩下做了些什么编译时。转到设置 - >编译器和调试器 - >全局编译器设置 - >其他设置并在编译器日志记录下拉框中选择完整命令行。现在，无论何时构建，gcc编译器命令都将记录在生成日志中。每当有人在StackOverflow询问你使用的gcc命令行时，你可以复制并粘贴生成日志中的内容。

So I'm trying to learn C++ and I've gotten as far as using header files. They really make no sense to me. I've tried many combinations of this but nothing so far has worked:

Main.cpp:

#include "test.h"

int main() {
    testClass Player1;
    return 0;
}

test.h:

#ifndef TEST_H_INCLUDED
#define TEST_H_INCLUDED
class testClass {
    private:
        int health;
    public:
        testClass();
        ~testClass();
        int getHealth();
        void setHealth(int inH);
};
#endif // TEST_H_INCLUDED

test.cpp:

#include "test.h"

testClass::testClass() { health = 100; }
testClass::~testClass() {}

int testClass::getHealth() { return(health); }
void testClass::setHealth(int inH) { health = inH; }

What I'm trying to do is pretty simple, but the way the header files work just makes no sense to me at all. Code blocks returns the following on build:

obj\Debug\main.o(.text+0x131)||In function main':| *voip*\test\main.cpp |6|undefined reference totestClass::testClass()'| obj\Debug\main.o(.text+0x13c):voip\test\main.cpp|7|undefined reference to `testClass::~testClass()'| ||=== Build finished: 2 errors, 0 warnings ===|

I'd appreciate any help. Or if you have a decent tutorial for it, that would be fine too (most of the tutorials I've googled haven't helped)

解决方案

Code::Blocks doesn't know that it has to compile test.cpp and produce an object file test.o (so that the latter may be linked together with main.o to produce the executable). You have to add test.cpp to your project.

In Code::Blocks, go to Project>Add File in the menu and select your test.cpp file. Make sure that both Release and Debug checkboxes are checked.

Then Build->Rebuild.

EDIT:

Here's a tip to help you see what the IDE is doing under the hood when compiling. Go to Settings -> Compiler and Debugger -> Global Compiler Settings -> Other settings and select Full command line in the Compiler logging drop box. Now, whenever you build, the gcc compiler commands will be logged in the Build Log. Whenever someone on StackOverflow asks you for the gcc command line you used, you can copy and paste what's in the Build Log.

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