How to set icon in golang

Golang is a very popular programming language and is widely used in web development, system programming and other fields. When developing Go applications, many people will encounter a question: How to set the application's icon? This article will share how to set the application icon in the Golang environment.

1. Prepare the icon file

Before setting the application icon, we need to prepare an icon file in .ico format. If you do not have a ready-made icon file, you can use an online tool or icon editing software to create an icon file in .ico format. Consider using the following online tools:

• https://iconverticons.com/online/
• https://favicon.io/favicon -converter/

Here I choose to use iconverticons to create an icon file named "myapp.ico".

2. Use the rsrc tool

rsrc is a tool for packaging resource files under the Windows platform. To set the application icon in Golang, we need to use the rsrc tool to package our icon file into a resource file. The rsrc tool can be downloaded through the following link:

• https://github.com/akavel/rsrc/releases

After downloading, rsrc Put the .exe file in a path, and we will operate in this path later.

3. Create the main.go file

After completing the preparation of the rsrc tool, we need to create a Go file to use the packaged icon file. In this article, we will use the "myapp.ico" file as the icon for the application. The following is our code example:

package main

import "github.com/visualfc/rsrc/rsrc"

func main() {
    rsrc.Init()
}

In the above code, we introduced the rsrc package and used the rsrc.Init() function to initialize the rsrc tool.

4. Use the rsrc tool to package resource files

After completing the creation of the main.go file, we need to use the rsrc tool to package the icon file into a resource file. In the command line, switch to the path where we previously placed rsrc.exe and execute the following command:

rsrc.exe -ico myapp.ico -o rsrc.syso -arch amd64

The above command means to package the "myapp.ico" icon file into a resource named "rsrc.syso" File, architecture is amd64. After successful execution, we can see that there is an additional file named "rsrc.syso" in the current directory. This file is the resource file we packaged.

5. Use the packaged resource files

After completing the previous operations, we can now start using the packaged resource files. We need to specify the application’s icon file in the main.go file. The following is our modified code example:

package main

import (
    "github.com/visualfc/rsrc/rsrc"
    "syscall"
)

var (
    kernel32                    = syscall.NewLazyDLL("kernel32.dll")
    procSetConsoleIcon          = kernel32.NewProc("SetConsoleIcon")
)

func main() {
    rsrc.Init()
    setIcon("myapp.ico")
}

func setIcon(iconFilePath string) {
    hIcon, err := syscall.LoadIcon(0, syscall.MAKEINTRESOURCE(1))
    if err != nil {
        panic(err)
    }

    err = procSetConsoleIcon.Find()
    if err == nil {
        syscall.SetLastError(procSetConsoleIcon.Call(uintptr(hIcon)))
        return
    }

    var hwnd uintptr
    syscall.NewLazyDLL("user32.dll").NewProc("GetForegroundWindow").Call(uintptr(unsafe.Pointer(&hwnd)))
    if hwnd == 0 {
        syscall.NewLazyDLL("user32.dll").NewProc("GetDesktopWindow").Call(uintptr(unsafe.Pointer(&hwnd)))
    }
    syscall.NewLazyDLL("user32.dll").NewProc("SendMessageW").Call(hwnd, 0x80 /*WM_SETICON*/, 1 /*ICON_SMALL*/, uintptr(hIcon))
}

In the above code, we introduced the syscall package and used the LoadIcon function to load the specified .ico format icon file. In the code, we also define a function called "setIcon" to set the application's icon. In the main function, we call the "setIcon" function to set our application icon.

After running the program, we will find that the application's icon has been successfully changed.

6. Summary

Through this article, we learned how to set the application icon in the Golang environment. First, we used the iconverticons tool to create an icon file named "myapp.ico", and then used the rsrc tool to package it into a resource file. Finally, we use the function in the syscall package to load the specified .ico icon file in the code, and use the setConsoleIcon and SendMessage functions to set the application's icon. At this point, the application's icon has been successfully changed.

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