I have an application with a Form1 , where my pictureBox is. I added another Form2 to the project that when executing it it turns a magnifying glass, so, to use it on top of the first Form1 .
My problem is: after pressing ESC which is the key that gives Close()
to Form2 (lens), the lens actually disappears but the application continues to consume memory and processor for Form2 (lens) as if it were just hidden.
Form2 has an exception error when moving the mouse too far to the corner of the screen when the lens is turned on. And this error still occurs even though it closed after pressing ESC .
The problem is how I am calling Form2 ?
private void button1_Click(object sender, EventArgs e)
{
new Form2().Show();
}
Or how is it being closed with Close()
?
Follow the code in Form2 (lens):
PictureBox pictureBox1 = new PictureBox(); // Have a picture box
int zoom = 1; // Variable for zoom value
public Form2()
{
pictureBox1.Dock = DockStyle.Fill; // Occupy the full area of the form
pictureBox1.BorderStyle = BorderStyle.FixedSingle; // Have a single border of clear representation
Controls.Add(pictureBox1); // Add the control to the form
FormBorderStyle = FormBorderStyle.None; // Make the form borderless to make it as lens look
Timer timer = new Timer(); // Have a timer for frequent update
timer.Interval = 100; // Set the interval for the timer
timer.Tick += timer_Tick; // Hool the event to perform desire action
timer.Start(); //Start the timer
printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); // Have a bitmap to store the image of the screen
}
void timer_Tick(object sender, EventArgs e)
{
var graphics = Graphics.FromImage(printscreen as Image); // Get the image of the captured screen
graphics.CopyFromScreen(0, 0, 0, 0, printscreen.Size); // Get the copy of screen
var position = Cursor.Position; // Get the position of cursor
var lensbmp = new Bitmap(50, 50); // Have a bitmap for lens
var i = 0; // Variable for row count
var j = 0; // Variable for column count
for (int row = position.X - 25; row < position.X + 25; row++) // Indicates row number
{
j = 0; // Set column value '0' for new column
for (int column = position.Y - 25; column < position.Y + 25; column++) // Indicate column number
{
lensbmp.SetPixel(i, j, printscreen.GetPixel(row, column)); // Place current region pixel to lens bitmap
j++; // Increase row count
}
i++; // Increase column count
}
this.pictureBox1.Image = new Bitmap(lensbmp, lensbmp.Width * zoom, lensbmp.Height * zoom); // Assign lens bitmap with zoom level to the picture box
Size = pictureBox1.Image.Size; // Assign optimal value to the form
Left = position.X + 20; // Place form nearer to cursor X value
Top = position.Y + 20; // Place form nearer to cursor Y value
TopMost = true; // Keep the form top level
}
// Override OnKeyDown for zoom in and zoom out actions
protected override void OnKeyDown(KeyEventArgs e)
{
if (e.KeyValue == 73) // Set "i" as the key for Zoom In.
zoom++; // Increase zoom by 1 item greater
else if (e.KeyValue == 79) // Set "o" as the key for Zoom Out
zoom--; // Decrease zoom by 1 item smaller
else if (e.KeyValue == 27) // Set "Esc" to close the magnifier
{
Close(); // Close the form
Dispose(); // Dispose the form
}
base.OnKeyDown(e);
}