问题
I'm in a research to find a way to take a screenshot of a window using Node.js, and I'm trying to do this with node-ffi, but I don't know how... at a time I'm stuck here:
var ffi = require('ffi');
var user32 = new ffi.Library("user32", {
FindWindowA: [ 'uint32' , [ 'string', 'string' ]]
, PrintWindow: [ 'int32' , [ 'int32', 'string', 'int32' ]]
});
var IMG;
var windowHandle = user32.FindWindowA(null, "Calculator");
var printWin = user32.PrintWindow(windowHandle, IMG, 0);
console.log(printWin);
console.log(IMG);
The result:
$ node get-print.js
1
undefined
EDITED
I found the following working code in C++
Bitmap bm = new Bitmap(1024, 768);
Graphics g = Graphics.FromImage(bm);
IntPtr hdc = g.GetHdc();
Form1.PrintWindow(this.Handle, hdc, 0);
g.ReleaseHdc(hdc);
g.Flush();
g.Dispose();
this.pictureBox1.Image = bm;
now I need to do this on NodeJs,
Anyone can help me?
回答1:
You could use a NPM package called "desktop-screenshot". It's very simple to use.
Example on NPM:
var screenshot = require('desktop-screenshot');
screenshot("screenshot.png", function(error, complete) {
if(error)
console.log("Screenshot failed", error);
else
console.log("Screenshot succeeded");
});
https://www.npmjs.com/package/desktop-screenshot
来源:https://stackoverflow.com/questions/43036301/how-can-i-take-a-window-screenshot-in-node-js