golang语言编写，设置windows桌面壁纸，图片来自于必应网站（cn.bing.com）

github源码地址：https://github.com/tujiaw/gowallpaper
有兴趣的Star一下吧

编译好的程序：https://pan.baidu.com/s/1l5OW9GeuUF0r5TFaBWkWZg (提取码：pcqh)

直接双击运行，显示如下：

设置微软必应的壁纸，用法如下：
day     - 每天更新壁纸
now     - 设置当天壁纸
prev    - 设置前一天壁纸
next    - 设置后一天壁纸
rand    - 间隔随机切换壁纸（如每分钟切换壁纸：rand 1m）
quit    - 退出
#

golang调用windows API

``` package winapi

import (

"log"
"syscall"
"unsafe"

)

var ApiList = map[string][]string {

"user32.dll": {
    "MessageBoxW",
    "SystemParametersInfoW",
},
"kernel32.dll": {

},

}

var ProcCache map[string]*syscall.Proc

func init() {

ProcCache = make(map[string]*syscall.Proc)
for dllName, apiList := range ApiList {
    d, err := syscall.LoadDLL(dllName)
    if err != nil {
        panic(err)
    }
    for _, name := range apiList {
        api, err := d.FindProc(name)
        if err != nil {
            log.Println(err, name)
        }
        ProcCache[name] = api
    }
    _ = syscall.FreeLibrary(d.Handle)
}

}

func WinCall(name string, a ...uintptr) {

if api, ok := ProcCache[name]; ok {
    _, _, err := api.Call(a...)
    if err != nil {
        log.Println(err)
    }
} else {
    log.Println("api not found, name:", name)
}

}

func IntPtr(n int) uintptr {

return uintptr(n)

}

func StrPtr(s string) uintptr {

p, _ := syscall.UTF16PtrFromString(s)
return uintptr(unsafe.Pointer(p))

}

func ShowMessage(title, text string) {

WinCall("MessageBoxW", IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))

}

func SetWallpaper(bmpPath string) {

WinCall("SystemParametersInfoW", IntPtr(20), IntPtr(0), StrPtr(bmpPath), IntPtr(3))

} ````