How to hide window in Go language

Go language is a very popular programming language and is widely used in various fields, especially system programming and network programming. On the Windows platform, sometimes you need to run a program in the background. In this case, you need to hide the window to prevent program pop-ups from affecting the user experience. This article mainly introduces how to hide windows in Go language.

1. Get the window handle

Before operating the window, you need to obtain the window handle. On the Windows platform, each window has a unique handle that identifies the window. You can use the Windows API function FindWindow or FindWindowEx to obtain the window handle.

Among them, the FindWindow function can find the window handle through the window's class name and window name. For example, to find a window named "MyAppName", you can use the following code:

hwnd := FindWindow(nil, syscall.StringToUTF16Ptr("MyAppName"))

You can also use the FindWindowEx function to find the child window handle through the handle. For example, to find a button control named "MyButton", you can use the following code:

btnHwnd := FindWindowEx(hwnd, 0, syscall.StringToUTF16Ptr("Button"), syscall.StringToUTF16Ptr("MyButton"))

It should be noted that these functions are Windows API functions, so the WinAPI library needs to be introduced.

2. Hide window

After obtaining the handle of the window, you can hide the window through the Windows API function ShowWindow. Specifically, if you set the nCmdShow parameter to SW_HIDE, you can hide the window.

For example, to hide the previously obtained window named "MyAppName", you can use the following code:

ShowWindow(hwnd, SW_HIDE)

If you want to redisplay the window, you can set the nCmdShow parameter to SW_SHOW .

3. Sample code

The following is a complete sample code that demonstrates how to get the window handle and hide the window:

package main

import (
    "syscall"
    "unsafe"
)

const (
    SW_HIDE = 0
    SW_SHOW = 5
)

var (
    user32      = syscall.NewLazyDLL("user32.dll")
    findWindow  = user32.NewProc("FindWindowW")
    showWindow = user32.NewProc("ShowWindow")
)

func FindWindow(className, windowName *uint16) uintptr {
    ret, _, _ := findWindow.Call(uintptr(0), uintptr(unsafe.Pointer(className)), uintptr(unsafe.Pointer(windowName)))
    return ret
}

func ShowWindow(hwnd uintptr, nCmdShow int32) bool {
    ret, _, _ := showWindow.Call(hwnd, uintptr(nCmdShow))
    return ret != 0
}

func main() {
    hwnd := FindWindow(nil, syscall.StringToUTF16Ptr("MyAppName"))
    if hwnd == 0 {
        panic("window not found")
    }
    ShowWindow(hwnd, SW_HIDE)
}

It should be noted that, Running the above code requires saving the code as a .go file and compiling it using the go command. Specifically, you can use the following command to compile:

go build -ldflags="-H windowsgui" main.go

Among them, the -H windowsgui parameter tells the compiler to generate a windowless application.

4. Summary

The Go language is a language that is very suitable for writing system applications. It can easily call Windows API functions and implement various system-level functions. This article introduces how to get the window handle and hide the window in Go language. I hope it will be helpful to everyone.

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