Golang如何调用windows下的dll动态库中的函数

使用syscall调用

package main
import (
  "fmt"
  "syscall"
  "time"
  "unsafe"
)
const (
  MB_OK                = 0x00000000
  MB_OKCANCEL          = 0x00000001
  MB_ABORTRETRYIGNORE  = 0x00000002
  MB_YESNOCANCEL       = 0x00000003
  MB_YESNO             = 0x00000004
  MB_RETRYCANCEL       = 0x00000005
  MB_CANCELTRYCONTINUE = 0x00000006
  MB_ICONHAND          = 0x00000010
  MB_ICONQUESTION      = 0x00000020
  MB_ICONEXCLAMATION   = 0x00000030
  MB_ICONASTERISK      = 0x00000040
  MB_USERICON          = 0x00000080
  MB_ICONWARNING       = MB_ICONEXCLAMATION
  MB_ICONERROR         = MB_ICONHAND
  MB_ICONINFORMATION   = MB_ICONASTERISK
  MB_ICONSTOP          = MB_ICONHAND
  MB_DEFBUTTON1 = 0x00000000
  MB_DEFBUTTON2 = 0x00000100
  MB_DEFBUTTON3 = 0x00000200
  MB_DEFBUTTON4 = 0x00000300
)
func abort(funcname string, err syscall.Errno) {
  panic(funcname + " failed: " + err.Error())
}
var (
  //    kernel32, _        = syscall.LoadLibrary("kernel32.dll")
  //    getModuleHandle, _ = syscall.GetProcAddress(kernel32, "GetModuleHandleW")
  user32, _     = syscall.LoadLibrary("user32.dll")
  messageBox, _ = syscall.GetProcAddress(user32, "MessageBoxW")
)
func IntPtr(n int) uintptr {
  return uintptr(n)
}
func StrPtr(s string) uintptr {
  return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
}
func MessageBox(caption, text string, style uintptr) (result int) {
  ret, _, callErr := syscall.Syscall9(messageBox,
      4,
      0,
      StrPtr(text),
      StrPtr(caption),
      style,
      0, 0, 0, 0, 0)
  if callErr != 0 {
      abort("Call MessageBox", callErr)
  }
  result = int(ret)
  return
}
//func GetModuleHandle() (handle uintptr) {
//    if ret, _, callErr := syscall.Syscall(getModuleHandle, 0, 0, 0, 0); callErr != 0 {
//        abort("Call GetModuleHandle", callErr)
//    } else {
//        handle = ret
//    }
//    return
//}
// windows下的第二种DLL方法调用
func ShowMessage2(title, text string) {
  user32 := syscall.NewLazyDLL("user32.dll")
  MessageBoxW := user32.NewProc("MessageBoxW")
  MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
}
func main() {
  //    defer syscall.FreeLibrary(kernel32)
  defer syscall.FreeLibrary(user32)
  //fmt.Printf("Retern: %d\n", MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL))
  num := MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL)
  fmt.Printf("Get Retrun Value Before MessageBox Invoked: %d\n", num)
  ShowMessage2("windows下的第二种DLL方法调用", "HELLO !")
  time.Sleep(3 * time.Second)
}
func init() {
  fmt.Print("Starting Up\n")
}

补充：go 调用windows dll 的三种方法

第三种方法是从Go\src\internal\syscall\windows\sysdll源码中找到的，三种方法的具体区别还不是很明晰，

初步判断：lazy应该是相当于动态库，其余两种直接把库加载到内存。

package main
import(
	"fmt"
	"syscall"
	"time"
  "unsafe"
)
const (
  MB_OK                = 0x00000000
  MB_OKCANCEL          = 0x00000001
  MB_ABORTRETRYIGNORE  = 0x00000002
  MB_YESNOCANCEL       = 0x00000003
  MB_YESNO             = 0x00000004
  MB_RETRYCANCEL       = 0x00000005
  MB_CANCELTRYCONTINUE = 0x00000006
  MB_ICONHAND          = 0x00000010
  MB_ICONQUESTION      = 0x00000020
  MB_ICONEXCLAMATION   = 0x00000030
  MB_ICONASTERISK      = 0x00000040
  MB_USERICON          = 0x00000080
  MB_ICONWARNING       = MB_ICONEXCLAMATION
  MB_ICONERROR         = MB_ICONHAND
  MB_ICONINFORMATION   = MB_ICONASTERISK
  MB_ICONSTOP          = MB_ICONHAND

  MB_DEFBUTTON1 = 0x00000000
  MB_DEFBUTTON2 = 0x00000100
  MB_DEFBUTTON3 = 0x00000200
  MB_DEFBUTTON4 = 0x00000300
)

func abort(funcname string, err syscall.Errno) {
  panic(funcname + " failed: " + err.Error())
}

var (
 
  user32, _     = syscall.LoadLibrary("user32.dll")
  messageBox, _ = syscall.GetProcAddress(user32, "MessageBoxW")
)

func IntPtr(n int) uintptr {
  return uintptr(n)
}

func StrPtr(s string) uintptr {
  return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
}

func MessageBox(caption, text string, style uintptr) (result int) {
  ret, _, callErr := syscall.Syscall9(messageBox,
      4,
      0,
      StrPtr(text),
      StrPtr(caption),
      style,
      0, 0, 0, 0, 0)
  if callErr != 0 {
      abort("Call MessageBox", callErr)
  }
  result = int(ret)
  return
}

//func GetModuleHandle() (handle uintptr) {
//    if ret, _, callErr := syscall.Syscall(getModuleHandle, 0, 0, 0, 0); callErr != 0 {
//        abort("Call GetModuleHandle", callErr)
//    } else {
//        handle = ret
//    }
//    return
//}

// windows下的第二种DLL方法调用
func ShowMessage2(title, text string) {
  user32 := syscall.NewLazyDLL("user32.dll")
  MessageBoxW := user32.NewProc("MessageBoxW")
  MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
} 

// windows下的第三种DLL方法调用
func ShowMessage3(title, text string) {
  user32,_ := syscall.LoadDLL("user32.dll")
  MessageBoxW,_ := user32.FindProc("MessageBoxW")
  MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
}

func main() {
  defer syscall.FreeLibrary(user32)

  num := MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL)
  fmt.Printf("Get Retrun Value Before MessageBox Invoked: %d\n", num)
  ShowMessage2("windows下的另一种DLL方法调用", "HELLO !")
	
	ShowMessage3("windows下的第三种DLL方法调用", "lyslyslys !")

  time.Sleep(3 * time.Second)
}

func init() {
  fmt.Print("Starting Up\n")
}

​

以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程宝库。如有错误或未考虑完全的地方，望不吝赐教。

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