Apple Mach-O 链接器 (Id) 错误：调用 c++ 时.m 文件中的文件

发布于 2024-12-01 01:42:59 字数 651 浏览 5 评论 0原文

我有一些 cpp 文件，其中编写了我的函数。我想在我的 iPhone 应用程序中调用该函数？我如何在我的 .m 文件中调用 C++ 方法？？？

这是我的 .cpp 文件

int add(int a, int b)
{
    return a+b;
}

现在在我的 viewDidLoad 事件中我使用以下代码只是为了获取结果并显示在标签中。

NSNumber *n = [[NSNumber alloc] initWithInt:add(5,7)];
[myLabel setText:[NSString stringWithFormat:@"%@",n]];

编译时收到以下错误：

Undefined symbols for architecture i386:
  "_add", referenced from:
      -[usingc__ViewController viewDidLoad] in usingc__ViewController.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status

代码中的错误在哪里？为此需要什么编辑？

原文

I have some cpp file where my functions are written. I want to call that functions in my iPhone app? How can i call c++ methods in my .m file???

Here is my .cpp file

int add(int a, int b)
{
    return a+b;
}

Now in my viewDidLoad event i am using following code just to fetch the result and display in a Label.

NSNumber *n = [[NSNumber alloc] initWithInt:add(5,7)];
[myLabel setText:[NSString stringWithFormat:@"%@",n]];

I received the following Error while compiling:

Undefined symbols for architecture i386:
  "_add", referenced from:
      -[usingc__ViewController viewDidLoad] in usingc__ViewController.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status

Where is the error in the code?? What edit is necessary for this??

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