go语言让windows发出声音，或者播放音乐的例子：会发出alert警告的声音

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                           package main

                           import "syscall"

                            func main(){ 

                                     winSound()

                            }

                            // golang 让windows发出警告的声音  todo 需要完善播放mp3之类

                            func winSound(  )  {

                                     funInDllFile, err := syscall.LoadLibrary("Winmm.dll") // 调用的dll文件

                                     if err != nil {

                                               print("cant not call : syscall.LoadLibrary , errorInfo :" + err.Error())

                                     }

                                     defer syscall.FreeLibrary(funInDllFile)

                                     // 调用的dll里面的函数是：

                                     funName := "PlaySound"

                                     // 注册一长串调用代码，简化为 _win32Fun 变量.

                                     win32Fun, err := syscall.GetProcAddress(syscall.Handle(funInDllFile), funName) 

                                     // 通过syscall.Syscall6()去调用win32的xxx函数，因为xxx函数有3个参数,故需取Syscall6才能放得下. 最后的3个参数,设置为0即可

                                     _, _, err = syscall.Syscall6(

                                               uintptr(win32Fun),                                                                             // 调用的函数名

                                               3,                                                                                                     // 指明该函数的参数数量

                                               uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("alert") ) ),                    // 该函数的参数1. 可通过msdn查找函数名 查参数含义

                                               // SystemStart

                                               uintptr( 0 ),                                                                                       // 该函数的参数2.                                  

                                               uintptr( 0 ),                                                                                       // 该函数的参数3.               

                                               0,                                                   

                                               0,                                                   

                                               0 )             

                            }