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在C代码中调用C++接口

zhiye — Thu, 10 Mar 2016 07:16:00 GMT

一在C源文件中调用C++��装的接�?br />
例如�Q?br />
要想在A.c文�g中，调用生命在B.h�Q�实现在B.cpp中的接口bool getMAC(char *mac_addr);

其实现方�?B.cpp 如下�Q?br />

1 // B.cpp
2
3 #ifndef _cplusplus
4 #define _cplusplus
5 #endif
6
7 #include
8
9 bool getMAC(char *mac_addr)
10 {
11 // your code
12
13 }

B.h 头文件的声明为：

1 // B.h
2
3 #ifndef _B_H
4 #define _B_H
5
6 #ifdef __cplusplus //__cplusplus是cpp中自定义的一个宏
7 extern "C" { //告诉�~�译器，�q�部分代码按C语言的格式进行编译，而不是C++�?/span>
8 #endif
9
10 bool getMAC(char *mac_addr);
11
12 #ifdef __cplusplus
13 }
14 #endif
15
16 #endif

A.c 中正常调用即�?br />

1 // A.c
2
3 #include "B.h"
4 #include
5
6 int main()
7 {
8     bool bRet = false;
9     char chMac[16] = {0};
10
11     bRet = getMAC(chMac);
12
13     return 0;
14 }

zhiye 2016-03-10 15:16 发表评论

2014 C++头文件两个类�怺�包含

zhiye — Wed, 24 Dec 2014 07:32:00 GMT

在构造自��q��c�L��Q�有可能会碰��C��个类之间的相互引用问题，例如�Q�定义了�c�A�c�B�Q�A中��用了B定义的类型，B中也使用了A定义的类�?/div>

例如�Q?/div>

�c�CGUICmd中调用了�c�CMainFrame�?/div>

�c�CMainFrame中调用了�c�CGUICmd�?br />

//////////////////////////////////////////////////////////////////////////
/// GUICmd.h
 
#ifndef _GUI_CMD_H
#define _GUI_CMD_H
 
class CGUICmd
{
public:
    CGUICmd(void);
    ~CGUICmd(void);
    int Gui_GetMessage(HWND hWnd, SOCKET sService, int bBlocking, CMainFrame* pFrame);
 
public:
    SOCKET    sService;
};

//////////////////////////////////////////////////////////////////////////
/// main_frame.h
 
#ifndef _MAIN_FRAME_H
#define _MAIN_FRAME_H
 
class CMainFrame:public CXMLWnd 
{
public:
    CGUICmd             m_cGuiCmd;      
};

不能单纯的再�Ҏ(gu��)��的源文�g中互相包含头文�g�?/div>

较好的方式：

main_frame.h �?include "GUICmd.h",

CGUICmd.h 中加入一行：class CMainFrame;

CGUICmd.cpp �?include "main_frame.h"

//////////////////////////////////////////////////////////////////////////
/// main_frame.h
 
#ifndef _MAIN_FRAME_H
#define _MAIN_FRAME_H
 
#pragma once
 
#include "GUICmd.h"

//////////////////////////////////////////////////////////////////////////
/// GUICmd.cpp
 
#include "GUICmd.h"
#include "main_frame.h"
 
 
//////////////////////////////////////////////////////////////////////////
/// GUICmd.h
 
#ifndef _GUI_CMD_H
#define _GUI_CMD_H
 
class CMainFrame;
 
class CGUICmd
{
}

zhiye 2014-12-24 15:32 发表评论

(5)字符串比较strcmp

zhiye — Thu, 12 Jun 2014 02:12:00 GMT

1 #include "stdafx.h"
2 #include "iostream"
3 #include "assert.h"
4
5 using namespace std;
6
7 int mystrcmp(const char* dest, const char* src)
8 {
9     assert (dest!=NULL && src!=NULL);
10     while (*dest++ == *src++)
11     {
12         if (*dest=='\0' || *src=='\0')
13             break;
14     }
15     return *dest > *src ? 1 : (*dest==*src ? 0 : -1);
16 }
17
18 int main(int argc, char* argv[])
19 {
20     printf("Hello World!\n");
21     cout << mystrcmp("abc", "abcd");
22     cout << endl;
23     return 0;
24 }
输出�Q?br />

Hello World!

-1

Press any key to continue

zhiye 2014-06-12 10:12 发表评论

(4)字符串链接strcat

zhiye — Thu, 12 Jun 2014 01:59:00 GMT

1 #include "stdafx.h"
2 #include "iostream"
3 #include "assert.h"
4 #include "string"
5
6 using namespace std;
7
8 char* mystrcat(char* dest, const char* src)
9 {
10     assert(dest!=NULL && src!=NULL);
11     char* p = dest;
12     while (*p!='\0')
13         p++;
14     while (*p++ = *src++);
15     *p = '\0';
16     return dest;
17 }
18
19 int main(int argc, char* argv[])
20 {
21     printf("Hello World!\n");
22     char buf[10] = "FU ";
23     char test[4] = "CK!";
24     mystrcat(buf, test);
25     cout << buf << endl;
26     return 0;
27 }
输出�Q?br />

Hello World!

FU CK!

Press any key to continue

zhiye 2014-06-12 09:59 发表评论

zhiye — Thu, 12 Jun 2014 01:50:00 GMT

1 #include "stdafx.h"
2 #include "iostream"
3
4 using namespace std;
5
6 int isechol (const char* str)
7 {
8     int length = strlen(str);
9     for (int i=0; i
10     {
11         // 0代表不是�Q?代表�?br />12         if (str[i] != str[length-i-1])
13         {
14             return 0;
15         }
16     }
17     return 1;
18 }
19
20 int main(int argc, char* argv[])
21 {
22     printf("Hello World!\n");
23     char buf[10] = "abcddcba";
24     if (isechol(buf))
25         cout << buf << " is echol" << endl;
26     else
27         cout << buf << " is not echol" << endl;
28     return 0;
29 }
输出�Q?br />

Hello World!

abcddcba is echol

Press any key to continue

zhiye 2014-06-12 09:50 发表评论

(2)字符串复制strncpy

zhiye — Thu, 12 Jun 2014 01:30:00 GMT

1 #include "stdafx.h"
2 #include "iostream"
3 #include "assert.h"
4
5 using namespace std;
6
7 char* mystrncpy(char* dest, const char* src, int n)
8 {
9     assert(dest!=NULL && src!=NULL);
10     int count = 0;
11     while (*src != '\0')
12     {
13         if (count >= n)
14         {
15             break;
16         }
17         dest[count++] = *src++;
18     }
19     dest[count] = '\0';
20     return dest;
21 }
22
23 int main(int argc, char* argv[])
24 {
25     printf("Hello World!\n");
26     char buf[10] = {0};
27     mystrncpy(buf, "FUCK!", 4);
28     cout << buf << endl;
29     return 0;
30 }

输出�Q?br />

Hello World!

FUCK!

Press any key to continue

zhiye 2014-06-12 09:30 发表评论

zhiye — Thu, 12 Jun 2014 01:11:00 GMT

1 #include "stdafx.h"
2 #include "iostream"
3 #include "assert.h"
4
5 using namespace std;
6
7 char* mystrcpy(char* dest, const char* src); // 1 const
8
9
10 int main(int argc, char* argv[])
11 {
12     printf("Hello World!\n");
13     char buf[10] = {0};
14     mystrcpy(buf, "FUCK!");
15     cout << buf << endl;
16     return 0;
17 }
18
19 char* mystrcpy(char* dest, const char* src)
20 {
21     assert(dest!=NULL && src!=NULL); // 2 assert
22     char* p = dest;
23     while (*p++ = *src++);
24     *p = '\0'; // 3 字符串结�?br />25     return dest;
26 }

输出�Q?br />

Hello World!

FUCK!

Press any key to continue

zhiye 2014-06-12 09:11 发表评论