Win32 SDK函數MessageBox的模擬實現（C語言版）

版本一：對於使用“掩碼”傳遞參數的方法，簡單的實現思路：

#include <stdio.h>

#define MB_OK            0x00000000

#define MB_OKCANCEL 0x00000001

 

#define MB_ICONHAND 0x00000010

#define MB_ICONQUESTION 0x00000020

 

#define MAX_RESULT 0xFFFFFFFF

 

int MessageBox(const char *context, unsigned int type)

{

    if(MAX_RESULT == (~MB_ICONHAND | type))

    {

       printf("\t圖標: 信息\t");

    }

    else if(MAX_RESULT == (~MB_ICONQUESTION | type))

    {

       printf("\t圖標: 問題\t");

    }

 

    printf("內容：%s\t", context);

 

    if(MAX_RESULT == (~MB_OKCANCEL | type))

    {

       printf("按鈕：確定 取消\t");

    }

    else if(MAX_RESULT == ((~MB_OK | type)))

    {

       printf("按鈕：確定\t");

    }

    putchar('\n');

    return 0;

}

 

int main(int argc, char *argv[])

{

    //unsigned int m_o = 0x00000001, m_o1 = 0x00000020, m_o2 = m_o | m_o1;

    //printf("%x", ~m_o | m_o2);

    

    MessageBox("hello, world", MB_OK | MB_ICONHAND);

    MessageBox("hello, world", MB_OK | MB_ICONQUESTION);

    MessageBox("hello, world", MB_OKCANCEL | MB_ICONHAND);

    MessageBox("hello, world", MB_OKCANCEL | MB_ICONQUESTION);

    printf("---------------------------------------------------\n");

    MessageBox("hello, world", MB_OK);

    MessageBox("hello, world", MB_OKCANCEL);

    MessageBox("hello, world", MB_ICONHAND);

    MessageBox("hello, world", MB_ICONQUESTION);

    

    return 0;

}

 

版本二：充分利用位運算的特性，大大減少了代碼量

#include <stdio.h>

#define MB_OK                       0x00000000

#define MB_OKCANCEL             0x00000001

#define MB_ABORTRETRYIGNORE         0x00000002

 

#define MB_ICONHAND 0x00000010

#define MB_ICONQUESTION 0x00000020

 

#define MB_TYPEMASK 0x0000000F

#define MB_ICONMASK 0x000000F0

 

#define MB_VALIDATE 0x00000000

 

char *TypeText[3] = {{"OK"},{"OK CANCEL"},{"ABORT RETRY IGNORE"}};

char *Icon[2] = {{"ICONHAND"}, {"ICONQUESTION"}};

 

int MessageBox(const char *context, unsigned int type)

{

    printf(TypeText[type & MB_TYPEMASK]);

    putchar('\n');

    printf("內容：%s\t", context);

    putchar('\n');

    if((type & MB_ICONMASK) == MB_VALIDATE)

    {

       printf("\n-------------------------\n");

       return -1;

    }

    printf(Icon[((type & MB_ICONMASK)>>4) - 1]);

    printf("\n-------------------------\n");

    return 0;

}

 

int main(int argc, char *argv[])

{   

    MessageBox("hello, world", MB_OK | MB_ICONHAND);

    MessageBox("hello, world", MB_OK | MB_ICONQUESTION);

    MessageBox("hello, world", MB_OKCANCEL | MB_ICONHAND);

    MessageBox("hello, world", MB_OKCANCEL | MB_ICONQUESTION);

    MessageBox("hello, world", MB_OK);

    MessageBox("hello, world", MB_OKCANCEL);

    MessageBox("hello, world", MB_ICONHAND);

    MessageBox("hello, world", MB_ICONQUESTION);

    return 0;

}