go 调用dll char*传输

参考：http://www.voidcn.com/article/p-ofnbgvoa-bpv.html

https://stackoverflow.com/questions/53721215/syscall-mustloaddll-mustfindproc-throws-the-specified-procedure-could-not-be-fo

c++:

MYLIBDLL char* testchar(int plus1);
MYLIBDLL void greet(char *name);

  

   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void greet(char *name)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	printf("Hello, %s!\n", name);
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      char* testchar(int plus1) {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	char* str = "hello world111111";
     
    
   

    

     

    
    

     
	return str;
     
    
   

    

     

    
    

     

      }
     
    
  
 

main.go代码：

  

   

    

     

    
    

     

      package main
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import (
     
    
   

    

     

    
    

     
 "syscall"
     
    
   

    

     

    
    

     
 "unsafe"
     
    
   

    

     

    
    

     
 "fmt"
     
    
   

    

     

    
    

     

      )
     
    
   

    

     

    
    

     

      import "C"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      func callDll() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       dll := syscall.MustLoadDLL("hik_client.dll")
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       procGreet := dll.MustFindProc("greet")
     
    
   

    

     

    
    

     

       procGreet.Call(uintptr(unsafe.Pointer(syscall.StringBytePtr("Cynhard11"))))
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       procName := dll.MustFindProc("testchar")
     
    
   

    

     

    
    

     

       r, _, _ := procName.Call(1)
     
    
   

    

     

    
    

     
 // 获取C返回的指针。
     
    
   

    

     

    
    

     
 // 注意C返回的r为char*，对应的Go类型为*byte
     
    
   

    

     

    
    

     

       p := (*byte)(unsafe.Pointer(r))
     
    
   

    

     

    
    

     
 // 定义一个[]byte切片，用来存储C返回的字符串
     
    
   

    

     

    
    

     

       data := make([]byte, 0)
     
    
   

    

     

    
    

     
 // 遍历C返回的char指针，直到 '\0' 为止
     
    
   

    

     

    
    

     
 for *p != 0 {
     
    
   

    

     

    
    

     

       data = append(data, *p)  // 将得到的byte追加到末尾
     
    
   

    

     

    
    

     

       r += unsafe.Sizeof(byte(0))  // 移动指针，指向下一个char
     
    
   

    

     

    
    

     

       p = (*byte)(unsafe.Pointer(r))  // 获取指针的值，此时指针已经指向下一个char
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       name := string(data)  // 将data转换为字符串
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       fmt.Printf("Hello, %s!\n", name)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 //var a = make([]byte, 256)
     
    
   

    

     

    
    

     
 //
     
    
   

    

     

    
    

     
 //
     
    
   

    

     

    
    

     
 //dll32 := syscall.NewLazyDLL("hik_client.dll")
     
    
   

    

     

    
    

     
 //fmt.Println("call dll:", dll32.Name)
     
    
   

    

     

    
    

     
 //GetPeopleName := dll32.NewProc("testchar")
     
    
   

    

     

    
    

     
 //
     
    
   

    

     

    
    

     
 //ret,_,err := GetPeopleName.Call(uintptr(unsafe.Pointer(&a)),2)
     
    
   

    

     

    
    

     
 //if err != nil {
     
    
   

    

     

    
    

     
 // fmt.Println(ret,a)
     
    
   

    

     

    
    

     
 // aaa := C.GoString(ret)
     
    
   

    

     

    
    

     
 // //C.free(unsafe.Pointer(cs))
     
    
   

    

     

    
    

     
 // //C.free(unsafe.Pointer(result))
     
    
   

    

     

    
    

     
 // //fmt.Println(aaa,a)
     
    
   

    

     

    
    

     
 //}
     
    
   

    

     

    
    

     
 //result, a, _ := g.Call(4)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 //fmt.Println("result is :", ret)
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      func main() {
     
    
   

    

     

    
    

     

       fmt.Println("start111111111!")
     
    
   

    

     

    
    

     

       callDll()
     
    
   

    

     

    
    

     
 //fmt.Println(C.add(2, 1))
     
    
   

    

     

    
    

     

      }
     
    
  
 

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/88381387