[英]showing 4 video at same time in c#
我想使用Task在Windows窗體中同時顯示4個視頻。 我有4次視頻播放點擊。 當我單擊第一個視頻播放按鈕時,第一個視頻播放,當我單擊第二個視頻播放按鈕時,第二個視頻播放和第一個視頻繼續同時播放。 但是 ,當我單擊第三個視頻播放按鈕時; 第一視頻停止播放,第二視頻和第三視頻同時播放。 同樣,當我單擊第四個視頻播放按鈕時,第二個視頻停止播放,只有第三個和第四個視頻同時播放。
我的代碼:
private async void play1_Click(object sender, EventArgs e)
{
string inputPath = textBox1.Text;
await Task.Run(() => {
ReadFrames1(inputPath); });
}
和
public void ReadFrames1(string inputPath)
{
using (var vFReader = new VideoFileReader())
{
vFReader.Open(inputPath);
for (int i = 0; i < vFReader.FrameCount; i++)
{
Bitmap videoFrame = vFReader.ReadVideoFrame();
System.Drawing.Image pic = resizeImage(new Bitmap(videoFrame), new Size(305, 267));
pictureBox1.Image = new Bitmap(pic);
}
vFReader.Dispose();
vFReader.Close();
}
}
play2_Click()
, play3_Click()
, play4_Click()
方法與play1_Click()
相同。 (例如,我的意思是play2_Click()
方法調用ReadFrames2()
並顯示在PictureBox2
。)我錯了?
對於通過WinForms的多線程,請使用BackgroundWorker 。
這是一個對我有用的代碼示例。 希望對您有幫助:
public Form1()
{
InitializeComponent();
}
private BackgroundWorker CreateBackgroundWorker()
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += ReadFrames;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
return worker;
}
private void worker_RunWorkerCompleted(object sender,
RunWorkerCompletedEventArgs e)
{
Button playButton = (Button) e.Result;
playButton.Enabled = true;
}
private void ReadFrames(object sender, DoWorkEventArgs e)
{
BackgroundWorker backgroundWorker = (BackgroundWorker) sender;
(string path, PictureBox pictureBox, Button playButton) arguments = ((string, PictureBox, Button)) e.Argument;
using(var vFReader = new VideoFileReader())
{
vFReader.Open(arguments.path);
for (int i = 0; i < vFReader.FrameCount; i++)
{
arguments.pictureBox.Image = new Bitmap(vFReader.ReadVideoFrame(), arguments.pictureBox.Size);
}
vFReader.Dispose();
vFReader.Close();
}
e.Result = arguments.playButton;
}
private void play1_Click(object sender, EventArgs e)
{
var worker = CreateBackgroundWorker();
worker.RunWorkerAsync((textBox1.Text, pictureBox1, play1));
play1.Enabled = false;
}
private void play2_Click(object sender, EventArgs e)
{
var worker = CreateBackgroundWorker();
worker.RunWorkerAsync((textBox2.Text, pictureBox2, play2));
play2.Enabled = false;
}
private void play3_Click(object sender, EventArgs e)
{
var worker = CreateBackgroundWorker();
worker.RunWorkerAsync((textBox3.Text, pictureBox3, play3));
play3.Enabled = false;
}
private void play4_Click(object sender, EventArgs e)
{
var worker = CreateBackgroundWorker();
worker.RunWorkerAsync((textBox4.Text, pictureBox4, play4));
play4.Enabled = false;
}
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