如何在 Puppeteer-sharp 中获得鼠标 position？

Question

Help get the current mouse position in puppeteer-sharp, I tried adapting Node.JS code for puppeteer sharp, but I can't do it.

page.evaluate(() => {
   document.onmousemove = function(e){
           mouseX = e.offsetX;
           mouseY = e.offsetY;
           console.log(mouseX, mouseY);
   }
})

Tried this, but I always get an x coordinate of zero:

var xOffset = await page.EvaluateExpressionAsync<int>("window.offsetX");
MessageBox.Show(xOffset.ToString());

Answer 1

First, the evaluate function won't get what you write in the console.log . You need to return something. As you are waiting for an event you can return a promise and resolve that promise inside the event.

page.EvaluateFunctionAsync<Point>(@"() => {
  return new Promise(resolve => {
    document.onmousemove = function(e){
      mouseX = e.offsetX;
      mouseY = e.offsetY;
      resolve({x: mouseX, y: mouseY});
    };
  });
}");