在使用C和C++代码的C++项目中编译错误
Compiling error in C++ project with C and C++ codes
我创建了一个C++项目，在该项目中我使用了C和C++代码，并且在标头方面存在一些问题。。。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"
预处理.c
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include "preprocessing.h"
main.c
#include <stdio.h>
#include <ctype.h>
#include "basicOCR.h"
和我自己的2个头文件：
basicOCR.h
#include <stdio.h>
#include <ctype.h>
预处理.h
#include <stdio.h>
#include <ctype.h>
每当我试图编译一个项目时，它都会编译basicOCR.cpp而不会出现任何问题，但预处理.c和main.c会在cstdlib与xstddef中出现语法错误。我知道它们是C++库。我读过这个如何混合C和C++
几乎什么都试过了，但都没用。
1> preprocessing.c
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(19): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(19): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(19): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2061: syntax error : identifier 'abs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2061: syntax error : identifier 'atexit'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2061: syntax error : identifier 'atof'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2061: syntax error : identifier 'atoi'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2061: syntax error : identifier 'atol'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2061: syntax error : identifier 'bsearch'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2061: syntax error : identifier 'calloc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2061: syntax error : identifier 'div'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2061: syntax error : identifier 'exit'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2061: syntax error : identifier 'free'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2061: syntax error : identifier 'getenv'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2061: syntax error : identifier 'labs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2061: syntax error : identifier 'ldiv'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2061: syntax error : identifier 'malloc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2061: syntax error : identifier 'mblen'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2061: syntax error : identifier 'mbstowcs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2061: syntax error : identifier 'mbtowc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2061: syntax error : identifier 'qsort'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2061: syntax error : identifier 'rand'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2061: syntax error : identifier 'realloc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2061: syntax error : identifier 'srand'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2061: syntax error : identifier 'strtod'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2061: syntax error : identifier 'strtol'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2061: syntax error : identifier 'strtoul'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2061: syntax error : identifier 'system'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2061: syntax error : identifier 'wcstombs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2061: syntax error : identifier 'wctomb'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(32): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(34): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(34): error C2061: syntax error : identifier 'lldiv'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(34): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstddef(18): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstddef(18): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(78): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(78): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(87): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(87): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(98): error C2061: syntax error : identifier 'tr1'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(98): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(98): error C2449: found '{' at file scope (missing function header?)
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(101): error C2059: syntax error : '}'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(125): error C2143: syntax error : missing '{' before ':'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(125): error C2059: syntax error : ':'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(132): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(132): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(141): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(141): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludeeh.h(27): fatal error C1189: #error : "eh.h is only for C++!"
1> main.c
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(19): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(19): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(19): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2061: syntax error : identifier 'abs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2061: syntax error : identifier 'atexit'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(21): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2061: syntax error : identifier 'atof'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2061: syntax error : identifier 'atoi'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2061: syntax error : identifier 'atol'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(22): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2061: syntax error : identifier 'bsearch'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2061: syntax error : identifier 'calloc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2061: syntax error : identifier 'div'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(23): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2061: syntax error : identifier 'exit'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2061: syntax error : identifier 'free'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2061: syntax error : identifier 'getenv'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(24): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2061: syntax error : identifier 'labs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2061: syntax error : identifier 'ldiv'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2061: syntax error : identifier 'malloc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(25): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2061: syntax error : identifier 'mblen'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2061: syntax error : identifier 'mbstowcs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2061: syntax error : identifier 'mbtowc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(26): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2061: syntax error : identifier 'qsort'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2061: syntax error : identifier 'rand'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2061: syntax error : identifier 'realloc'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(27): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2061: syntax error : identifier 'srand'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2061: syntax error : identifier 'strtod'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2061: syntax error : identifier 'strtol'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(28): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2061: syntax error : identifier 'strtoul'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2061: syntax error : identifier 'system'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(29): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2061: syntax error : identifier 'wcstombs'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2061: syntax error : identifier 'wctomb'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(30): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(32): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(34): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(34): error C2061: syntax error : identifier 'lldiv'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstdlib(34): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstddef(18): error C2054: expected '(' to follow 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludecstddef(18): error C2061: syntax error : identifier 'using'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(78): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(78): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(87): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(87): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(98): error C2061: syntax error : identifier 'tr1'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(98): error C2059: syntax error : ';'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(98): error C2449: found '{' at file scope (missing function header?)
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(101): error C2059: syntax error : '}'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(125): error C2143: syntax error : missing '{' before ':'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(125): error C2059: syntax error : ':'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(132): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(132): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(141): error C2143: syntax error : missing '{' before '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexstddef(141): error C2059: syntax error : '<'
1>C:Program Files (x86)Microsoft Visual Studio 10.0VCincludeeh.h(27): fatal error C1189: #error : "eh.h is only for C++!"
看起来vc使用c++头作为c代码。
这并不能回答问题，但为什么不直接使用C++呢？您唯一需要C的时候是希望与不同版本的编译器兼容，这在构建插件体系结构时会发生。在这种情况下，您在"SDK"头中声明插件原型，如下所示：
#ifndef __SDK_H
#define __SDK_H
#ifdef __cplusplus
extern "C"
{
#endif
__declspec(dllexport) return_type calling_convention function_name(parameters);
#ifdef __cplusplus
}
#endif
#endif
然后你可以编译你的plugin.c，它应该包含以下内容：
#include "sdk.h"
return_type function_name(parameters)
{
/*Do stuff here*/
}
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