go 调用windows dll 的三种方法

发布时间：2020-12-14 02:34:01 所属栏目：Windows 来源：网络整理

导读：参考：https://blog.csdn.net/qq_39584315/article/details/81287669 大部分代码参考：https://studygolang.com/articles/2712 第三种方法是从Gosrcinternalsyscallwindowssysdll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

参考：https://blog.csdn.net/qq_39584315/article/details/81287669

大部分代码参考：https://studygolang.com/articles/2712

第三种方法是从Gosrcinternalsyscallwindowssysdll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)
    if callErr != 0 {
        abort("Call MessageBox",callErr)
    }
    result = int(ret)
    return
}

//func GetModuleHandle() (handle uintptr) {
//    if ret,callErr := syscall.Syscall(getModuleHandle,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(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),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: %dn",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 Upn")
}

（编辑：李大同）

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