[英]c# backgroundWorker and trackBar
一些代碼:
鎖定bitmapData的函數:
public static BitmapData LockData(Bitmap bitmap)
{
Rectangle bitmapRect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
BitmapData bitmapData = bitmap.LockBits(bitmapRect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
return bitmapData;
}
解鎖bitnapData的函數:
public static void UnlockData(Bitmap bitmap, BitmapData bitmapData)
{
bitmap.UnlockBits(bitmapData);
}
改變圖像亮度的功能:
public static void Bright(int bright, BitmapData bitmapData, BackgroundWorker worker, DoWorkEventArgs e)
{
byte nPixelFormat = 0;
if (bitmapData.PixelFormat == PixelFormat.Format24bppRgb) nPixelFormat = 3;
else if (bitmapData.PixelFormat == PixelFormat.Format32bppArgb) nPixelFormat = 4;
int max = bitmapData.Height - 1;
int percent = 0;
unsafe
{
for (int y = 0; y < bitmapData.Height; y++)
{
byte* pBmpRow = (byte*)(bitmapData.Scan0 + y * bitmapData.Stride);
for (int x = 0; x < bitmapData.Width; x++)
{
if (worker.CancellationPending)
{
e.Cancel = true;
return;
}
int bVal = pBmpRow[nPixelFormat * x] + bright;
int gVal = pBmpRow[nPixelFormat * x + 1] + bright;
int rVal = pBmpRow[nPixelFormat * x + 2] + bright;
Clamp(ref bVal);
Clamp(ref gVal);
Clamp(ref rVal);
pBmpRow[nPixelFormat * x] = (byte)bVal;
pBmpRow[nPixelFormat * x + 1] = (byte)gVal;
pBmpRow[nPixelFormat * x + 2] = (byte)rVal;
}
//System.Threading.Thread.Sleep(5);
int curPercent = (y * 100) / max;
if (curPercent > percent)
{
percent = curPercent;
worker.ReportProgress(percent);
}
}
}
}
在此功能中,我正在檢查backgroundWorker是否中止並更新進度。
現在我有w跟蹤欄和numericBox,它們用於更改亮度。 跟蹤欄或numericBox值更改時,backgroundWorker將啟動。 問題是,當backgroundWorker繁忙並且我更改了trackbarValue時,backgroundWorker應該停止並重新啟動。 現在在我的代碼中它可以使用liku按鈕。 當工作者忙時,值更改將停止工作者,然后下一個值更改將其啟動。
碼:
private void OnNumericBoxValueChanged(object sender, EventArgs e)
{
m_trkBarBright.Value = (int)m_numericBright.Value;
brightValue = m_trkBarBright.Value;
if (backgroundWorker.IsBusy)
{
backgroundWorker.CancelAsync();
}
else
{
backgroundWorker.RunWorkerAsync();
}
m_btnOK.Focus();
}
private void WorkerDoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = (BackgroundWorker)sender;
Colors.CopyImgData(m_orgImage, m_tempImage);
data = Colors.LockData(m_tempImage);
Colors.Bright(brightValue, data,worker, e);
}
private void WorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
Colors.UnlockData(m_tempImage, data);
MessageBox.Show(e.Error.Message);
progressBar1.Value = 0;
}
else if (e.Cancelled)
{
Colors.UnlockData(m_tempImage, data);
if(!exit)
m_imgBox.UpdateImage(m_tempImage);
MessageBox.Show("Canceled");
progressBar1.Value = 0;
}
else
{
Colors.UnlockData(m_tempImage, data);
if (!exit)
m_imgBox.UpdateImage(m_tempImage);
progressBar1.Value = 0;
MessageBox.Show("Done");
}
}
private void WorkerProgress(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
有人知道如何解決此問題嗎?
正確的方法是檢查backgroundWorker.CancellationPending
並從WorkerDoWork
設置e.Cancel = true
。
CancelAsync
不會停止工作程序,它只是向線程發送一條消息,說“我想停止”。
這是一個完整的樣本 。
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