# webview
[](https://travis-ci.org/zserge/webview)
[](https://ci.appveyor.com/project/zserge/webview)
[](https://godoc.org/github.com/zserge/webview)
[](https://goreportcard.com/report/github.com/zserge/webview)
A tiny cross-platform webview library for C/C++/Golang to build modern cross-platform GUI.
It supports two-way JavaScript bindings (to call JavaScript from C/C++/Go and to call C/C++/Go from JavaScript).
It uses Cocoa/WebKit on macOS, gtk-webkit on Linux and MSHTML (IE10/11) on Windows.
<p align="center"><img alt="linux" src="examples/todo-go/screenshots/screenshots.png"></p>
## Webview for Go developers
If you are interested in writing Webview apps in C/C++ - skip to the next section.
### Getting started
Install Webview library with `go get`:
```
$ go get github.com/zserge/webview
```
Import the package and start using it:
```go
package main
import "github.com/zserge/webview"
func main() {
// Open wikipedia in a 800x600 resizable window
webview.Open("Minimal webview example",
"https://en.m.wikipedia.org/wiki/Main_Page", 800, 600, true)
}
```
It is not recommended to use `go run` (although it works perfectly fine on Linux). Use `go build` instead:
```bash
# Linux
$ go build -o webview-example && ./webview-example
# MacOS uses app bundles for GUI apps
$ mkdir -p example.app/Contents/MacOS
$ go build -o example.app/Contents/MacOS/example
$ open example.app # Or click on the app in Finder
# Windows requires special linker flags for GUI apps.
# It's also recommended to use TDM-GCC-64 compiler for CGo.
# http://tdm-gcc.tdragon.net/download
$ go build -ldflags="-H windowsgui" -o webview-example.exe
```
### API
See [godoc](https://godoc.org/github.com/zserge/webview).
### How to serve or inject the initial HTML/CSS/JavaScript into the webview?
First of all, you probably want to embed your assets (HTML/CSS/JavaScript) into the binary to have a standalone executable. Consider using [go-bindata](https://github.com/jteeuwen/go-bindata) or any other similar tools.
Now there are two major approaches to deploy the content:
* Serve HTML/CSS/JS with an embedded HTTP server
* Injecting HTML/CSS/JS via JavaScript binding API
To serve the content it is recommended to use ephemeral ports:
```go
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
log.Fatal(err)
}
defer ln.Close()
go func() {
// Set up your http server here
log.Fatal(http.Serve(ln, nil))
}()
webview.Open("Hello", "http://"+ln.Addr().String(), 400, 300, false)
```
Injecting the content via JS bindings is a bit more complicated, but feels more solid and does not expose any additional open TCP ports.
Leave `webview.Settings.URL` empty to start with a bare minimal HTML5. It will open a webview with `<div id="app"></div>` in it. Alternatively, use data URI to inject custom HTML code (don't forget to URL-encode it):
```go
const myHTML = `<!doctype html><html>....</html>`
w := webview.New(webview.Settings{
URL: `data:text/html,` + url.PathEscape(myHTML),
})
```
Keep your initial HTML short (a few kilobytes maximum).
Now you can inject more JavaScrtipt once the webview becomes ready using `webview.Eval()`. You can also inject CSS styles using JavaScript:
```go
w.Dispatch(func() {
// Inject CSS
w.Eval(fmt.Sprintf(`(function(css){
var style = document.createElement('style');
var head = document.head || document.getElementsByTagName('head')[0];
style.setAttribute('type', 'text/css');
if (style.styleSheet) {
style.styleSheet.cssText = css;
} else {
style.appendChild(document.createTextNode(css));
}
head.appendChild(style);
})("%s")`, template.JSEscapeString(myStylesCSS)))
// Inject JS
w.Eval(myJSFramework)
w.Eval(myAppJS)
})
```
This works fairly well across the platforms, see `counter-go` example for more details about how make a webview app with no web server. It also demonstrates how to use ReactJS, VueJS or Picodom with webview.
### How to communicate between native Go and web UI?
You already have seen how to use `w.Eval()` to run Javascript inside the webview. There is also a way to call Go code from JavaScript.
On the low level there is a special callback, `webview.Settings.ExternalInvokeCallback` that receives a string argument. This string can be passed from JavaScript using `window.external.invoke_(someString)`.
This might seem very inconvenient, and that is why there is a dedicated `webview.Bind()` API call. It binds an existing Go object (struct or struct pointer) and creates/injects JS API for it. Now you can call JS methods and they will result in calling native Go methods. Even more, if you modify the Go object - it can be automatically serialized to JSON and passed to the web UI to keep things in sync.
Please, see `counter-go` example for more details about how to bind Go controllers to the web UI.
## Debugging and development tips
If terminal output is unavailable (e.g. if you launch app bundle on MacOS or
GUI app on Windows) you may use `webview.Debug()` and `webview.Debugf()` to
print logs. On MacOS such logs will be printed via NSLog and can be seen in the
`Console` app. On Windows they use `OutputDebugString` and can be seen using
`DebugView` app. On Linux logging is done to stderr and can be seen in the
terminal or redirected to a file.
To debug the web part of your app you may use `webview.Settings.Debug` flag. It
enables Web Inspector in WebKit and work on Linux and MacOS (use popup menu to
open the web inspector). On Windows there is no easy to way to enable
debugging, but you may include Firebug in your HTML code:
```html
<script type="text/javascript" src="https://getfirebug.com/firebug-lite.js"></script>
```
Even though Firebug browser extension development has been stopped, Firebug
Lite is still available and just works.
## Distributing webview apps
On Linux you get a standalone executable. It will depend on GTK3 and GtkWebkit, so if you distribute your app in DEB or RPM format include those dependencies. Application icon can be specified by providing a `.desktop` file.
On MacOS you are likely to ship an app bundle. Make the following directory structure and just zip it:
```
example.app
└── Contents
├── Info.plist
├── MacOS
| └── example
└── Resources
└── example.icns
```
Here, `Info.plist` is a [property list file](https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/AboutInformationPropertyListFiles.html) and `*.icns` is a special icon format. You may convert PNG to icns [online](iconverticons.com/online/).
On Windows you probably would like to have a custom icon for your executable. It can be done by providing a resource file, compiling it and and linking with it. Typically, `windres` utility is used to compile resources.
You may find some example build scripts for all three platforms [here](https://github.com/naivesound/glitch/tree/master/dist).
Also, if you want to cross-compile your webview app - use [xgo](https://github.com/karalabe/xgo).
## Webview for C/C++ developers
### Getting started
Download [webview.h](https://raw.githubusercontent.com/zserge/webview/master/webview.h) and include it in your C/C++ code:
```c
// main.c
#include "webview.h"
#ifdef WIN32
int WINAPI WinMain(HINSTANCE hInt, HINSTANCE hPrevInst, LPSTR lpCmdLine,
int nCmdShow) {
#else
int main() {
#endif
/* Open wikipedia in a 800x600 resizable window */
webview("Minimal webview example",
"https://en.m.wikipedia.org/wiki/Main_Page", 800, 600, 1);
return 0;
}
```
Build it:
```bash
# Linux
$ cc main.c -DWEBVIEW_GTK=1 $(shell pkg-config --cflags --libs gtk+-3.0 webkitgtk
最小的算法 音乐作曲家和合成器_go语言_代码_下载
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最小的算法 音乐作曲家和合成器_go语言_代码_下载
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configure.ac 9KB configure.ac 7KB Makefile.am 789B Makefile.am 685B Makefile.am 682B Makefile.am 655B Makefile.am 646B Makefile.am 444B test.asset 15B test.asset 15B test.asset 15B test.asset 15B release-windows.bat 925B glitch.c 24KB glitch_test.c 14KB main.c 335B main.cc 3KB codepoints 16KB RtAudio.cpp 347KB RtMidi.cpp 94KB iasiothiscallresolver.cpp 23KB rtaudiomodule.cpp 21KB teststops.cpp 8KB rtmidi_c.cpp 8KB asiolist.cpp 7KB rtaudio_c.cpp 7KB testall.cpp 6KB playsaw.cpp 6KB asio.cpp 5KB midiclock.cpp 5KB record.cpp 5KB playraw.cpp 4KB duplex.cpp 4KB sysextest.cpp 4KB asiodrivers.cpp 3KB audioprobe.cpp 3KB midiout.cpp 3KB cmidiin.cpp 3KB qmidiin.cpp 2KB midiprobe.cpp 2KB rtaudio_stub.cpp 97B rtmidi_stub.cpp 94B codemirror.css 8KB styles.css 7KB roboto-mono.css 3KB material.css 3KB styles.css 1KB material-icons.css 970B styles.css 213B audioprobe.dsp 5KB teststops.dsp 5KB duplex.dsp 5KB testall.dsp 5KB playraw.dsp 5KB playsaw.dsp 5KB record.dsp 5KB sysextest.dsp 4KB midiprobe.dsp 4KB cmidiin.dsp 4KB midiout.dsp 4KB qmidiin.dsp 4KB rtaudio.dsw 2KB RtMidi.dsw 1KB MaterialIcons-Regular.eot 140KB roboto-mono-v4-greek_cyrillic_latin-300.eot 58KB roboto-mono-v4-greek_cyrillic_latin-500.eot 56KB roboto-mono-v4-greek_cyrillic_latin-regular.eot 56KB roboto-mono-v4-greek_cyrillic_latin-700.eot 56KB
mcgill.gif 5KB mcgill.gif 5KB ccrma.gif 3KB ccrma.gif 3KB .gitattributes 24B .gitignore 156B .gitignore 90B get_yucky.glitch 878B drums.glitch 860B sur_la_planche.glitch 827B das_model.glitch 668B arp.glitch 172B white.glitch 131B saw.glitch 129B drum.glitch 111B poly.glitch 110B nervous.glitch 99B right.glitch 89B sqr.glitch 88B 42.glitch 67B dreamy.glitch 58B assets.go 5.75MB assets.go 18KB rtaudio.go 15KB webview.go 14KB assets.go 12KB rtmidi.go 9KB config.go 6KB release.go 6KB doc.go 5KB toc.go 4KB app.go 4KB共 262 条
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