使用mingw制作dll文件

• 安装mingw

• 准备math.c文件

  //math.c
  
  #include<stdio.h>
  
  int add(int a,int b){
  
      return a+b;
  
  }
  
  int sub(int a,int b){
  
      return a-b;
  
  }
  
  int mul(int a,int b){
  
      return a*b;
  
  }
  
  int div(int a,int b){
  
      return a/b;
  
  }
  

• 制作dll

  gcc math.c -shared -o math.dll -Wl,--out-implib,math.lib
  

  生成 math.dll、math.lib

• 验证dll

  • 编写加载dll文件的代码

     #include<stdio.h>
    
     #include <windows.h>
    
     typedef int (*AddFunc)(int ,int);
    
     typedef int (*SubFunc)(int ,int);
    
     typedef int (*MulFunc)(int ,int);
    
     typedef int (*DivFunc)(int ,int);
    
     int main(void)
    
     {
    
           int a=10,b=2;
    
           HMODULE hDll = LoadLibrary("math.dll");
    
           if (hDll != NULL)
    
           {
    
                 AddFunc add = (AddFunc)GetProcAddress(hDll, "add");
    
                 SubFunc sub = (SubFunc)GetProcAddress(hDll, "sub");
    
                 MulFunc mul = (MulFunc)GetProcAddress(hDll, "mul");
    
                 DivFunc div = (DivFunc)GetProcAddress(hDll, "div");
    
                 if (add != NULL)
    
                    printf("a+b=%d\n",add(a,b));
    
                 if (sub != NULL)
    
                    printf("a-b=%d\n",sub(a,b));
    
                 if (mul != NULL)
    
                    printf("a*b=%d\n",mul(a,b));
    
                 if (div != NULL)
    
                    printf("a/b=%d\n",div(a,b));
    
                 FreeLibrary(hDll);
    
           }
    
     }
    

  • 编译 gcc loaddll_dynamic_show.c -o loaddll_dynamic_show.exe

  • 运行 loaddll_dynamic_show.exe

  • 结果

    a+b=12
    
    a-b=8
    
    a*b=20
    
    a/b=5