C++项目中编译C和C++代码时出现错误

Question

我创建了一个使用C和C++代码的C++项目，但是在头文件方面遇到了一些问题... 好的，我有3个代码： basicOCR.cpp

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

#include "preprocessing.h"
#include "basicOCR.h"

preprocessing.c

#include <stdio.h>
#include <ctype.h>
#include <math.h>

#include "preprocessing.h"

main.c

#include <stdio.h>
#include <ctype.h>

#include "basicOCR.h"

"我的两个头文件是：basicOCR.h"。

#include <stdio.h>
#include <ctype.h>

preprocessing.h

#include <stdio.h>
#include <ctype.h>

每当我尝试编译一个项目时，basicOCR.cpp 可以顺利编译，但是 preprocessing.c 和 main.c 在 cstdlib 和 xstddef 中出现语法错误。我知道它们是 C++ 库。我阅读了这篇文章如何混合使用 C 和 C++并尝试了几乎所有方法，但都没有成功。

1>  preprocessing.c
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(19): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(19): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(19): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2061: syntax error : identifier 'abs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2061: syntax error : identifier 'atexit'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2061: syntax error : identifier 'atof'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2061: syntax error : identifier 'atoi'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2061: syntax error : identifier 'atol'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2061: syntax error : identifier 'bsearch'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2061: syntax error : identifier 'calloc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2061: syntax error : identifier 'div'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2061: syntax error : identifier 'exit'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2061: syntax error : identifier 'free'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2061: syntax error : identifier 'getenv'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2061: syntax error : identifier 'labs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2061: syntax error : identifier 'ldiv'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2061: syntax error : identifier 'malloc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2061: syntax error : identifier 'mblen'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2061: syntax error : identifier 'mbstowcs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2061: syntax error : identifier 'mbtowc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2061: syntax error : identifier 'qsort'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2061: syntax error : identifier 'rand'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2061: syntax error : identifier 'realloc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2061: syntax error : identifier 'srand'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2061: syntax error : identifier 'strtod'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2061: syntax error : identifier 'strtol'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2061: syntax error : identifier 'strtoul'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2061: syntax error : identifier 'system'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2061: syntax error : identifier 'wcstombs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2061: syntax error : identifier 'wctomb'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(32): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(34): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(34): error C2061: syntax error : identifier 'lldiv'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(34): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstddef(18): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstddef(18): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(78): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(78): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(87): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(87): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(98): error C2061: syntax error : identifier 'tr1'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(98): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(98): error C2449: found '{' at file scope (missing function header?)
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(101): error C2059: syntax error : '}'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(125): error C2143: syntax error : missing '{' before ':'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(125): error C2059: syntax error : ':'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(132): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(132): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(141): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(141): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\eh.h(27): fatal error C1189: #error :  "eh.h is only for C++!"
1>  main.c
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(19): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(19): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(19): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2061: syntax error : identifier 'abs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2061: syntax error : identifier 'atexit'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(21): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2061: syntax error : identifier 'atof'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2061: syntax error : identifier 'atoi'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2061: syntax error : identifier 'atol'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(22): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2061: syntax error : identifier 'bsearch'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2061: syntax error : identifier 'calloc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2061: syntax error : identifier 'div'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(23): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2061: syntax error : identifier 'exit'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2061: syntax error : identifier 'free'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2061: syntax error : identifier 'getenv'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(24): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2061: syntax error : identifier 'labs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2061: syntax error : identifier 'ldiv'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2061: syntax error : identifier 'malloc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(25): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2061: syntax error : identifier 'mblen'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2061: syntax error : identifier 'mbstowcs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2061: syntax error : identifier 'mbtowc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(26): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2061: syntax error : identifier 'qsort'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2061: syntax error : identifier 'rand'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2061: syntax error : identifier 'realloc'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(27): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2061: syntax error : identifier 'srand'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2061: syntax error : identifier 'strtod'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2061: syntax error : identifier 'strtol'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(28): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2061: syntax error : identifier 'strtoul'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2061: syntax error : identifier 'system'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(29): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2061: syntax error : identifier 'wcstombs'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2061: syntax error : identifier 'wctomb'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(30): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(32): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(34): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(34): error C2061: syntax error : identifier 'lldiv'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstdlib(34): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstddef(18): error C2054: expected '(' to follow 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstddef(18): error C2061: syntax error : identifier 'using'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(78): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(78): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(87): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(87): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(98): error C2061: syntax error : identifier 'tr1'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(98): error C2059: syntax error : ';'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(98): error C2449: found '{' at file scope (missing function header?)
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(101): error C2059: syntax error : '}'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(125): error C2143: syntax error : missing '{' before ':'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(125): error C2059: syntax error : ':'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(132): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(132): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(141): error C2143: syntax error : missing '{' before '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstddef(141): error C2059: syntax error : '<'
1>C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\eh.h(27): fatal error C1189: #error :  "eh.h is only for C++!"

- OpenMinded

---

你能否给我们提供错误信息？ - Eregrith

你忘记实际上提出问题了。同时，最好提到你收到的确切错误消息；否则我们将不得不猜测，而猜测具有臭名昭著的高错误率。 - Jon

此外，除非您需要特定的类型定义，否则请勿在您的头文件中包含系统头文件。 - Eregrith

语法错误就像它没有识别C++库一样...问题是我现在应该做什么才能让它工作。感谢回复。 - OpenMinded

当然，这只是预览。 - OpenMinded

Answer 1

我理解了。解决方法是右键点击每个C代码文件，选择属性>C/C++>高级>编译为，并勾选编译为C++代码(/TP)。

- OpenMinded

---

更好的解决方案是使用 .cpp 文件扩展名 - 然后 Visual Studio 将自动使用 C++ 编译器进行编译。通过使用 .c 文件扩展名，您暗示您想要使用 C 编译器，这就是为什么您必须明确地覆盖它的原因。 - Rob

或者，如此处所述：https://dev59.com/o-o6XIcBkEYKwwoYTSou#6086702，您可以在项目属性中仅设置一次“编译为C++代码”设置。这比为每个单独的C文件设置要好。 - nonbeing

Answer 2

看起来vc使用c++头文件来编写c代码。

这并没有回答问题，但为什么不直接使用C++呢？只有在构建插件架构时需要与不同编译器的不同版本兼容时，才需要使用C。在这种情况下，您可以像这样在“SDK”头文件中声明插件原型：

#ifndef __SDK_H
#define __SDK_H

#ifdef __cplusplus
extern "C"
    {
#endif
    __declspec(dllexport) return_type calling_convention function_name(parameters);

#ifdef __cplusplus
    }
#endif

#endif

然后您可以编译包含以下内容的plugin.c文件：

#include "sdk.h"

return_type function_name(parameters)
     {
     /*Do stuff here*/
     }

- user877329