我在 Objective-C 方法体中使用的 C 函数找不到 Xcode 打印符号 [英] Xcode print symbol not found for my C function which used in Objective-C method body

问题描述

Xcode build 打印此错误.

Xcode build prints this error .

未定义符号:
"EGViewportDimensionMake(unsigned int,无符号整数、无符号整数、无符号int)"，引用自:- [Renderer render] in Renderer.o ld: 未找到符号 collect2: ld返回 1 个退出状态

Undefined symbols:
"EGViewportDimensionMake(unsigned int, unsigned int, unsigned int, unsigned int)", referenced from: -[Renderer render] in Renderer.o ld: symbol(s) not found collect2: ld returned 1 exit status

我无法弄清楚是什么问题.我不擅长经典的 C 语法.这些是函数源代码文件:

I cannot figure out what's the problem. I'm not good at classic C syntax. These are the function source code files:

EGViewportDimension.h

#import <Foundation/Foundation.h>

struct EGViewportDimension
{
    NSUInteger x;
    NSUInteger y;
    NSUInteger width;
    NSUInteger height;
};
typedef struct EGViewportDimension EGViewportDimension;

EGViewportDimension EGViewportDimensionMake(NSUInteger x, NSUInteger y, NSUInteger width, NSUInteger height);

EGViewportDimension.m

#import "EGViewportDimension.h"

EGViewportDimension EGViewportDimensionMake(NSUInteger x, NSUInteger y, NSUInteger width, NSUInteger height)
{
    EGViewportDimension dim;
    dim.x = x;
    dim.y = y;
    dim.width = width;
    dim.height = height;
    return dim;
}

我引用并使用了这个:

渲染器.mm

#import "EGViewportDimension.h"

//.... many codes omitted.

EGViewportDimension vdim = EGViewportDimensionMake(0, 0, backingWidth, backingHeight);

推荐答案

我通过将 Renderer.mm 重命名为 Renderer.m 解决了这个问题.它使用了一些 C++ 类，所以我把它作为 Objective-C++ 代码，但是有一些问题.我删除了所有 C++ 调用并将其重命名为 Objective-C 代码.

I solved it by renaming Renderer.mm to Renderer.m. It was used some C++ classes so I made it as Objective-C++ code, but there was some problem. I removed all C++ calls and renamed it to Objective-C code.

但我仍然不知道使用经典 C 函数定义的 Objective-C++ 有什么问题.

But I still don't know what's the problem with Objective-C++ with classic C function definition.

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我把这个当成了另一个问题，我得到了答案.看这里:是否禁止调用经典C来自 Objective-C++ 类方法体的函数?

I asked this as another question, and I got an answer. See here: Does it prohibited calling classic C function from Objective-C++ class method body?

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