Help for Flicker free drawing in c#

[abdunnabisk]

I am developing a program in c# where I have to show device connected each other in a dashboard.I am drawing in OnPaint event.when the user move the devices the background is flickering.because each time i am clearing the graphics objects.
I tried using Doublebuffering but still not working.

any body can help me on this.

Thanks
Abdun

[leoiser]

did you use the below code

this.SetStyle(ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint |
ControlStyles.DoubleBuffer, true);

If if does not work please let me know.You can email me for immediate reply.Thanks

I am developing a program in c# where I have to show device connected each other in a dashboard.I am drawing in OnPaint event.when the user move the devices the background is flickering.because each time i am clearing the graphics objects.
I tried using Doublebuffering but still not working.

any body can help me on this.

Thanks
Abdun

[abdunnabisk]

did you use the below code

this.SetStyle(ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint |
ControlStyles.DoubleBuffer, true);

If if does not work please let me know.You can email me for immediate reply.Thanks

I used that but its not working.

[leoiser]

using System.Runtime.InteropServices;

#region "Avod Flickering the form"

int paintFrozen;

private const int WM_SETREDRAW = 0xB;

[DllImport("User32")]
private static extern bool SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);

private bool FreezePainting
{
get { return paintFrozen > 0; }
set
{
if (value && IsHandleCreated && this.Visible)
{
if (0 == paintFrozen++)
{
SendMessage(Handle, WM_SETREDRAW, 0, 0);
}
}
if (!value)
{
if (paintFrozen == 0)
{
return;
}

if (0 == --paintFrozen)
{
SendMessage(Handle, WM_SETREDRAW, 1, 0);
Invalidate(true);
}
}
}
}
#endregion


Before drawing the image/picture put FreezePainting =true; and after finish FreezePainting=false; it will work...

[abdunnabisk]

using System.Runtime.InteropServices;

#region "Avod Flickering the form"

int paintFrozen;

private const int WM_SETREDRAW = 0xB;

[DllImport("User32")]
private static extern bool SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);

private bool FreezePainting
{
get { return paintFrozen > 0; }
set
{
if (value && IsHandleCreated && this.Visible)
{
if (0 == paintFrozen++)
{
SendMessage(Handle, WM_SETREDRAW, 0, 0);
}
}
if (!value)
{
if (paintFrozen == 0)
{
return;
}

if (0 == --paintFrozen)
{
SendMessage(Handle, WM_SETREDRAW, 1, 0);
Invalidate(true);
}
}
}
}
#endregion


Before drawing the image/picture put FreezePainting =true; and after finish FreezePainting=false; it will work...

Thank you for reply.
Actually i am drawingon a Panel not on form.same thing can be applicabe
to Panel or not?

[abdunnabisk]

Actually i am drawing on a Panel's OnPaint event.I have created a Graphics object
using Graphics g=Panel.CreateGraphics();

Each time when OnPaint event occurs i clearing the g objects and trying to
redraw the line between devices when they are moved.

where to Put FreezePainting=true inside OnPaintEvent.
I put this in OnPaint event's starting line FreezePainting=true
and OnPaint event's lastline FreezePainting=false;

Its not drawing anything.

Thanks

[leoiser]

before calling the paint() u should call for FreezePainting=true

Actually i am drawing on a Panel's OnPaint event.I have created a Graphics object
using Graphics g=Panel.CreateGraphics();

Each time when OnPaint event occurs i clearing the g objects and trying to
redraw the line between devices when they are moved.

where to Put FreezePainting=true inside OnPaintEvent.
I put this in OnPaint event's starting line FreezePainting=true
and OnPaint event's lastline FreezePainting=false;

Its not drawing anything.

Thanks