Article directory
- Preface
- 2. Usage steps
-
- 1.Introduce the assembly
- 2.Introduce classes
- 3.Creation method
- 4. Screen recording code class
- 4. Trampling on pit records
Foreword
This article will record the full screen, select the area and finally convert it to a Gif.
2. Usage steps
1.Introduce assembly
PresentationCore
WindowsBase
2. Introduction of classes
ScreenshotFormView via hyperlink on the right
ScreenHelper View via hyperlink on the right
3.Creation method
/// <summary>
/// Compress image quality
/// </summary>
/// <param name="ImageBefore">Image before compression</param>
/// <param name="quality">Quality</param>
/// <returns></returns>
public static System.IO.MemoryStream CompressImageStream(Image ImageBefore, long quality)
{<!-- -->
System.Drawing.Imaging.ImageCodecInfo myEncoder = GetEncoder("image/jpeg");
System.Drawing.Imaging.EncoderParameters encoderParameters = new System.Drawing.Imaging.EncoderParameters(1);
encoderParameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
var memoryStream = new System.IO.MemoryStream();
ImageBefore.Save(memoryStream, myEncoder, encoderParameters);
return memoryStream;
}
/// <summary>
/// Compress image quality
/// </summary>
/// <param name="ImageBefore">Image before compression</param>
/// <param name="quality">Quality</param>
/// <returns></returns>
public static Image CompressImage(Image ImageBefore, long quality)
{<!-- -->
var stream = CompressImageStream(ImageBefore, quality);
return Image.FromStream(stream);
}
/// <summary>
/// Get ImageCodecInfo through mimeType (similar to ContentType)
/// </summary>
/// <param name="mimeType">Media type (similar to ContentType)</param>
/// <returns>ImageCodecInfo</returns>
public static System.Drawing.Imaging.ImageCodecInfo GetEncoder(string mimeType)
{<!-- -->
System.Drawing.Imaging.ImageCodecInfo[] encoders = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
for (int i = 0; i < encoders. Length; i ++ )
{<!-- -->
if (encoders[i].MimeType == mimeType)
{<!-- -->
return encoders[i];
}
}
return null;
}
4. Screen recording code class
code show as below:
/// <summary>
/// Record screen
/// </summary>
public class ScreenRecording
{<!-- -->
/// <summary>
/// Instantiate
/// </summary>
/// <param name="IsLoop">Whether to set the Gif to loop</param>
public ScreenRecording(bool IsLoop = true)
{<!-- -->
this.IsLoop = IsLoop;
}
/// <summary>
/// Whether the screen is being recorded
/// </summary>
public bool IsRecording {<!-- --> get; private set; }
/// <summary>
/// Whether to set the Gif to play in a loop
/// </summary>
public bool IsLoop {<!-- --> get; set; }
/// <summary>
/// Screen recording thread
/// </summary>
Task task {<!-- --> get; set; }
#region Gif Actions
/// <summary>
/// Record Gif pictures
/// </summary>
/// <param name="flieName">save path</param>
/// <param name="quality">Quality (≤0 does not take effect)</param>
/// <param name="timeout">Generate a frame of picture every millisecond</param>
/// <param name="EndAction">Callback after the gif image is generated</param>
/// <returns>Whether screen recording was successfully started</returns>
public bool StartRecordingGif(string flieName, long quality = -1, int timeout = 200, Action EndAction = null)
{<!-- -->
return StartRecordingGif(flieName, quality, timeout, EndAction, ScreenHelper.CopyScreenToImage);
}
/// <summary>
/// Select an area to record Gif pictures
/// </summary>
/// <param name="flieName">Save path</param>
/// <param name="quality">Quality (≤0 does not take effect)</param>
/// <param name="timeout">Generate a frame of picture every millisecond</param>
/// <param name="EndAction">Callback after the gif image is generated</param>
/// <returns>Whether screen recording was successfully started</returns>
public bool StartRecordingGifScreen(string flieName, long quality = -1, int timeout = 200, Action EndAction = null)
{<!-- -->
bool IsRecording = false;
ScreenshotForm screenshotForm = new ScreenshotForm();
screenshotForm.ClickSuccessEvent + = () =>
{<!-- -->
if (screenshotForm.Bitmap == null)
{<!-- -->
return;
}
IsRecording = StartRecordingGif(flieName, quality, timeout, EndAction,
() => ScreenHelper.CopyScreenToImage(screenshotForm.UpperLeftSource, screenshotForm.Bitmap.Size));
};
screenshotForm.ShowDialog();
return IsRecording;
}
/// <summary>
/// Record Gif pictures
/// </summary>
/// <param name="flieName">Save path</param>
/// <param name="quality">Quality (≤0 does not take effect)</param>
/// <param name="timeout">Generate a frame of picture every millisecond</param>
/// <param name="EndAction">Callback after the gif image is generated</param>
/// <param name="ImageFunc">How to generate an image</param>
/// <returns>Whether screen recording was successfully started</returns>
public bool StartRecordingGif(string flieName, long quality, int timeout, Action EndAction, Func<System.Drawing.Bitmap> ImageFunc)
{<!-- -->
if(IsRecording)
{<!-- -->
return false;
}
IsRecording = true;
task = Task.Run(() =>
{<!-- -->
var Gif = new System.Windows.Media.Imaging.GifBitmapEncoder();
while (IsRecording)
{<!-- -->
System.Threading.Thread.Sleep(timeout);
if (!IsRecording)
{<!-- -->
break;
}
var img = ImageFunc();
if (quality > 0)
{<!-- -->
img = (Bitmap)CompressImage(img, quality);
}
var bmp = img.GetHbitmap();
var src = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
bmp,
IntPtr. Zero,
System.Windows.Int32Rect.Empty,
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
Gif.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(src));
}
if (this. IsLoop)
{<!-- -->
using (var ms = new MemoryStream())
{<!-- -->
Gif. Save(ms);
var fileBytes = ms.ToArray();
var applicationExtension = new byte[] {<!-- --> 33, 255, 11, 78, 69, 84, 83, 67, 65, 80, 69, 50, 46, 48, 3, 1, 0, 0 , 0 };
var newBytes = new List<byte>();
newBytes.AddRange(fileBytes.Take(13));
newBytes.AddRange(applicationExtension);
newBytes.AddRange(fileBytes.Skip(13));
File.WriteAllBytes(flieName, newBytes.ToArray());
}
}
else
{<!-- -->
using (FileStream fs = new FileStream(flieName, FileMode.Create))
{<!-- -->
Gif. Save(fs);
}
}
if (EndAction != null)
{<!-- -->
EndAction();
}
task = null;
});
return true;
}
/// <summary>
/// Stop recording Gif
/// </summary>
/// <param name="IsWait">Whether to force to wait for the Gif to be generated</param>
public void StopRecordingGif(bool IsWait = false)
{<!-- -->
IsRecording = false;
if (task != null & amp; & amp; IsWait)
{<!-- -->
task.Wait();
}
}
#endregion
}
4. Pitfall records
- The System.Windows.Media.Imaging.GifBitmapEncoder class must be created and used in the same thread during use, otherwise an error will be reported.