webview: Example won't compile on windows after latest updates

What OS are you using (`uname -a`, or Windows version)?

Windows 11 21H2 Build 22000.739

What programming language are you using (C/C++/Go/Rust)?

go version go1.18.3 windows/amd64 gcc (tdm64-1) 10.3.0 vscode 1.68.1

What did you expect to see and what you saw instead?

I expected the example basic.go to pop up a windows.

Instead I have compile errors that say: cannot use webview.HintNone (constant unknown with invalid type) as webview.Hint value in argument to w.SetSize could not import C (cgo preprocessing failed) (compile)

I cannot figure out if this is a Go bug, vscode bug, or gcc. But I swear it all used to work fine until the latest updates.

package main

import "github.com/webview/webview"

func main() {
	w := webview.New(false)
	defer w.Destroy()
	w.SetTitle("Basic Example")
	w.SetSize(480, 320, webview.HintNone)
	w.SetHtml("Thanks for using webview!")
	w.Run()
}

If I compile on the command line I get…

C:\Users\username\Development\Golang\example>go build
# github.com/webview/webview
In file included from webview.cc:1:
webview.h:839:10: fatal error: WebView2.h: No such file or directory
  839 | #include "WebView2.h"
      |          ^~~~~~~~~~~~
compilation terminated.

I’m pretty sure it has more to do with Go and cgo. But I’m hoping someone here would have figured it out first.

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 15

Most upvoted comments

Okay. I guess that explains the change. I will try another compiler. Thanks again.

precisionpete on Jun 20, 2022

Are you by any chance running the commands using PowerShell? If that’s the case then please try the good old Command Prompt.

Yes, in Command Prompt example compiled fine. Thanks.

lirix360 on Jun 20, 2022

I’ve copied the exact commands from the readme, pasted them into a new batch script named build.bat, ran the script and the Go example program compiled and ran just fine on my end.

Please see if you missed anything here and if so then I would love to know how you came to miss those steps and how the readme can be improved so that those steps are not missed again by anyone else.

mkdir my-project && cd my-project
mkdir build libs "libs/webview"
curl -sSLo "libs/webview/webview.h" "https://raw.githubusercontent.com/webview/webview/master/webview.h"
curl -sSLo "libs/webview/webview.cc" "https://raw.githubusercontent.com/webview/webview/master/webview.cc"

mkdir libs\webview2
curl -sSL "https://www.nuget.org/api/v2/package/Microsoft.Web.WebView2" | tar -xf - -C libs\webview2
copy /Y libs\webview2\build\native\x64\WebView2Loader.dll build

go mod init example.com/m
go get github.com/webview/webview

set CGO_CPPFLAGS="-I%cd%\libs\webview2\build\native\include"
set CGO_LDFLAGS="-L%cd%\libs\webview2\build\native\x64"

curl -sSLo basic.go "https://raw.githubusercontent.com/webview/webview/master/examples/basic.go"

go build -ldflags="-H windowsgui" -o build/basic.exe basic.go && "build/basic.exe"

SteffenL on Jun 20, 2022

I’m unable to reproduce this issue as described on Windows 11 21H2.

I installed MinGW-w64 from WinLibs and latest version of Go.