I am trying to print a panel and it's child controls inside of it. But when I run the program, it is throwing an error:
System.ArgumentException: 'targetBounds'
in line ctl.DrawToBitmap(bitmap, bounds);
Here is the code I used from this answer
private void BtnPrint_Click(object sender, EventArgs e)
{
Print(this.pnlID);
}
public void Print(Panel pnl)
{
PrinterSettings ps = new PrinterSettings();
//pnlID = pnl;
//GetPrintArea(pnl);
prntprvw.Document = printdoc;
printdoc.PrintPage += new PrintPageEventHandler(printdoc_printpage);
prntprvw.ShowDialog();
}
public void printdoc_printpage(Object sender, PrintPageEventArgs e)
{
var bitmap = ScrollableControlToBitmap(this.pnlID, false);
Rectangle pagearea = e.PageBounds;
e.Graphics.DrawImage(bitmap, new Rectangle( 0, 0, pnlID.Width, pnlID.Height));
}
public Bitmap ScrollableControlToBitmap(ScrollableControl canvas, bool includeHidden)
{
canvas.AutoScrollPosition = new Point(0, 0);
if (includeHidden)
{
canvas.SuspendLayout();
foreach (Control child in canvas.Controls)
{
child.Visible = true;
}
canvas.ResumeLayout(true);
}
Size containerSize = canvas.PreferredSize;
var bitmap = new Bitmap(containerSize.Width, containerSize.Height, PixelFormat.Format32bppArgb);
bitmap.SetResolution(this.DeviceDpi, this.DeviceDpi);
var graphics = Graphics.FromImage(bitmap);
graphics.Clear(canvas.BackColor);
var rtfPrinter = new RichEditPrinter(graphics);
try
{
DrawNestedControls(canvas, canvas, new Rectangle(Point.Empty, containerSize), bitmap, rtfPrinter);
return bitmap;
}
finally
{
rtfPrinter.Dispose();
graphics.Dispose();
}
}
private void DrawNestedControls(Control outerContainer, Control parent, Rectangle parentBounds, Bitmap bitmap, RichEditPrinter rtfPrinter)
{
for (int i = parent.Controls.Count - 1; i >= 0; i--)
{
var ctl = parent.Controls[i];
var clipBounds = (parent == outerContainer)
? ctl.Bounds
: Rectangle.Intersect(new Rectangle(Point.Empty, parentBounds.Size), ctl.Bounds);
if (ctl.Visible)
{
var bounds = outerContainer.RectangleToClient(parent.RectangleToScreen(clipBounds));
if (ctl is RichTextBox rtb)
{
rtfPrinter.DrawRtf(rtb.Rtf, parentBounds, clipBounds);
}
else
{
ctl.DrawToBitmap(bitmap, bounds);
}
}
if (ctl.HasChildren)
{
DrawNestedControls(outerContainer, ctl, clipBounds, bitmap, rtfPrinter);
}
}
}
public class RichEditPrinter : IDisposable
{
Graphics dc = null;
RTBPrinter rtb = null;
public RichEditPrinter(Graphics graphics)
{
this.dc = graphics;
this.rtb = new RTBPrinter() { ScrollBars = RichTextBoxScrollBars.None };
}
public void DrawRtf(string rtf, Rectangle canvas, Rectangle layoutArea)
{
rtb.Rtf = rtf;
rtb.Draw(dc, canvas, layoutArea);
rtb.Clear();
}
public void Dispose() => this.rtb.Dispose();
private class RTBPrinter : RichTextBox
{
//Code converted from code found here: http://support.microsoft.com/kb/812425/en-us
public void Draw(Graphics g, Rectangle hdcArea, Rectangle layoutArea)
{
IntPtr hdc = g.GetHdc();
var canvasAreaTwips = new RECT().ToInches(hdcArea);
var layoutAreaTwips = new RECT().ToInches(layoutArea);
FORMATRANGE fmtRange = new FORMATRANGE()
{
chrg = new CHARRANGE() { cpMax = -1, cpMin = 0 },
hdc = hdc,
hdcTarget = hdc,
rc = layoutAreaTwips,
rcPage = canvasAreaTwips
};
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(fmtRange));
Marshal.StructureToPtr(fmtRange, lParam, false);
SendMessage(this.Handle, EM_FORMATRANGE, (IntPtr)1, lParam);
Marshal.FreeCoTaskMem(lParam);
g.ReleaseHdc(hdc);
}
[DllImport("User32.dll", CharSet = CharSet.Auto, SetLastError = true)]
internal static extern int SendMessage(IntPtr hWnd, int uMsg, IntPtr wParam, IntPtr lParam);
internal const int WM_USER = 0x0400;
// https://learn.microsoft.com/en-us/windows/win32/controls/em-formatrange
internal const int EM_FORMATRANGE = WM_USER + 57;
[StructLayout(LayoutKind.Sequential)]
internal struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
public Rectangle ToRectangle() => Rectangle.FromLTRB(Left, Top, Right, Bottom);
public RECT ToInches(Rectangle rectangle)
{
float inch = 14.9f;
return new RECT()
{
Left = (int)(rectangle.Left * inch),
Top = (int)(rectangle.Top * inch),
Right = (int)(rectangle.Right * inch),
Bottom = (int)(rectangle.Bottom * inch)
};
}
}
// https://learn.microsoft.com/en-us/windows/win32/api/richedit/ns-richedit-formatrange?
[StructLayout(LayoutKind.Sequential)]
internal struct FORMATRANGE
{
public IntPtr hdcTarget; // A HDC for the target device to format for
public IntPtr hdc; // A HDC for the device to render to, if EM_FORMATRANGE is being used to send the output to a device
public RECT rc; // The area within the rcPage rectangle to render to. Units are measured in twips.
public RECT rcPage; // The entire area of a page on the rendering device. Units are measured in twips.
public CHARRANGE chrg; // The range of characters to format (see CHARRANGE)
}
[StructLayout(LayoutKind.Sequential)]
internal struct CHARRANGE
{
public int cpMin; // First character of range (0 for start of doc)
public int cpMax; // Last character of range (-1 for end of doc)
}
}
}
How can I fix the error?
