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](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](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))
}
````
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