.NET(C#)中Puppeteer API的PuppeteerSharp的使用
时间:2022-10-19
1、使用文档
PuppeteerSharp文档:http://www.puppeteersharp.com/api/index.html
PuppeteerSharp源码:https://github.com/kblok/puppeteer-sharp
2、安装PuppeteerSharp
使用Nuget搜索PuppeteerSharp,找到PuppeteerSharp点击安装即可。
相关文档:VS(Visual Studio)中Nuget的使用
3、PuppeteerSharp的使用
1)网页截图
await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
var browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
Headless = true
});
var page = await browser.NewPageAsync();
await page.GoToAsync("http://www.google.com")
;
await page.ScreenshotAsync(outputFile);
生成截图前也可以改变ViewPort:
await page.SetViewport(new ViewPortOptions
{
Width = 500,
Height = 500
});
2)网页保存成pdf文件
await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
var browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
Headless = true
});
var page = await browser.NewPageAsync();
await page.GoToAsync("http://www.google.com")
;
await page.PdfAsync(outputFile);
3)向网页中注入HTML
using(var page = await Browser.NewPageAsync())
{
await page.SetContentAsync("<div>My Receipt</div>");
var result = await page.GetContentAsync();
await page.PdfAsync(outputFile);
SaveHtmlToDB(result);
}
4)执行Javascript(js)代码
using (var page = await Browser.NewPageAsync())
{
var seven = await page.EvaluateFunctionAsync<int>("4 + 3");
var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);
Console.WriteLine(someObject.a);
}
5)等待Selector内容加载
using (var page = await Browser.NewPageAsync())
{
await page.GoToAsync("http://www.spapage.com")
;
await page.WaitForSelectorAsync("div.main-content")
await page.PdfAsync(outputFile));
}
6)等待满足Function条件
using (var page = await Browser.NewPageAsync())
{
await page.GoToAsync("http://www.spapage.com")
;
var watchDog = page.WaitForFunctionAsync("window.innerWidth < 100");
await Page.SetViewport(new ViewPortOptions { Width = 50, Height = 50 });
await watchDog;
}
7)连接到远程浏览器
var options = new ConnectOptions()
{
BrowserWSEndpoint = $"wss://www.externalbrowser.io?token={apikey}
"
};
var url = "https://www.google.com/"
;
using (var browser = await PuppeteerSharp.Puppeteer.ConnectAsync(options))
{
using (var page = await browser.NewPageAsync())
{
await page.GoToAsync(url);
await page.PdfAsync("wot.pdf");
}
}
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