Change color of ProgressBar. 1

[MasterRacker]

.NET does not appear to directly support changing the color of a progress bar. In another forum a suggestion was made to "try and post PBM_SETBARCOLOR or PBM_SETBKCOLOR to the progress bar window" via the COntrol.Handle property.

Can anyone provide more assistance with the syntax for this type of operation?

[purple]Jeff
It's never too early to begin preparing for [/purple]International Talk Like a Pirate Day

 

[dalchri]

Please let me know if anyone knows how to change the style to continuous too instead of the segmented style!

 

[obislavu]

Here is the code where the bkcolor is set to green and the progess bar is black.

using System.Runtime.InteropServices;
//..
private const Int32 WM_USER = 0x0400;
private const Int32 CCM_FIRST=0x2000;
private const Int32 PBM_SETBARCOLOR = WM_USER +9;
private const Int32 PBM_SETBKCOLOR = CCM_FIRST +1;

public System.Windows.Forms.ProgressBar progress = new System.Windows.Forms.ProgressBar();
//..        
[DllImport("user32.dll", CharSet=CharSet.Auto)]
private static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, Int32 lParam);

//..
private void TestProgressBar1(int num)
{
	this.progress.Minimum = 1;
	this.progress.Maximum = num;
	this.progress.Value = 1;
	this.progress.Step = 1;
	SendMessage(this.progress.Handle,PBM_SETBARCOLOR,0, 0x78FF0000);
	SendMessage(this.progress.Handle,PBM_SETBKCOLOR,0, 0x7800FF00);
	// Loop through .
	for (int x = 1; x <= num; x++)
	{
		this.progress.PerformStep();
		System.Threading.Thread.Sleep(1000);

	}
}

private void button1_Click(object sender, System.EventArgs e)
{
	TestProgressBar1(10);
}

obislavu

 

[MasterRacker]

Thanks. I will play with this as soon as I get a chance.

In the SendMessage call, I am guessing the last hex parameter is the color? If so, can you point me to some documentation on how that's encoded? Is it CMYK or something different?

[purple]Jeff
It's never too early to begin preparing for [/purple]International Talk Like a Pirate Day

 

[MasterRacker]

OK, After playing a little, I see those are not the colors.

Unfortunately, at this point of my life, Interop services are still over my head. I've been digging through MSDN but haven't found anything useful yet. Any insight on how to set specific colors would be appreciated.

[purple]Jeff
It's never too early to begin preparing for [/purple]International Talk Like a Pirate Day

 

[chiph]

The last argument is a COLORREF, which has it's hexadecimal form as: 0x00bbggrr where bb is blue value, gg is the green value, and rr is the red value.

Obislavu -- where does the "78" come in, in the hi byte of the hi word?

Chip H.


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[MasterRacker]

Chip, that's kind of what I thought after some more poking around on MSDN. I figured it's what they call ARGB color. You're telling me it's bgr instead of rgb though.

The 78 has to play some role here because, the background paints black and according to your example it should be blue.

[purple]Jeff
It's never too early to begin preparing for [/purple]International Talk Like a Pirate Day

 

[MasterRacker]

You know, according to the MSDN ProgressBar description there are overloaded ForeColor and BackColor properties.

I wonder if this couldn't be attacked differently via a CreateGraphics call similar to this example

[purple]Jeff
It's never too early to begin preparing for [/purple]International Talk Like a Pirate Day