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Using a Common Dialog Box to Print Contents of Various Controls

Hello.

I am trying to print the contents of a RichTextBox using a Windows Common Dialog Box component.

It works to print, if I select OK. If I select Cancel the program crashes with a run-time error #32755.

The name of the common dialog box is 'cmdEd'. It was coded by another developer, without comments, to print the contents of the rtfDisplay RichTextBox control.

The code is as follows:

cdgEd.Flags = cdlPDReturnDC + cdlPDNoPageNums
If rtfDisplay.SelLength = 0 Then
cdgEd.Flags = cdgEd.Flags + cdlPDAllPages
Else
cdgEd.Flags = cdgEd.Flags + cdlPDSelection
End If
cdgEd.ShowPrinter
rtfDisplay.SelPrint cdgEd.hDC

I presently don't understand these 'Flags'. I know how to code the vbOKOnly or vbCancel on a message box.

How does one properly code this dialog component to insure that clicking on cancel truly does cancel and unload the dialog?

JNowlin

JonFish85

try something like this:

Private Sub Command1_Click()
On Error Goto Problems

CommonDialog.Show
'Other code here
Exit Sub
problems:
If Err.Number = 32755 Then
Exit Sub
Else
MsgBox Err.Description
End If
End Sub

hope this works!

AzraSound

They have set the CancelError to true. This allows you to determine when a user presses cancel and take any necessary action, e.g,

Sub PrintStuff()
On Error Goto PrintStuff_EH

'...

PrintStuff_EH:
If Err.Number = cdlCancel Then
'User pressed cancel
End If
End Sub

AzraSound

Sorry, CancelError property of the common dialog control.

Richie_Simonetti

jnowlin, i would like to ask for which reason do you use a commondialog to print richtrextbox.
If i remember well, it has incorporated that funcionality itself:RichTextBox1.selprint

Richie_Simonetti

Ups!
Sorry forget my comment.

jnowlin

ASKER

Hi AzraSound,

I changed the CancelError property of this common dialog control to False. When I ran the program, opened a file into the RichTextBox control, 'rtfDisplay', and selected "Cancel" instead of "Print", I got a different run-time error:

Error #32001
"Invalid HDC"

I don't know what HDC means. It must be some sort of relationship between the common dialog control and the print dialog that opens up within Windows2000 that I'm still unclear about.

Does this Cancel button need to be coded to Exit Sub when a user clicks it?

Jim

ASKER CERTIFIED SOLUTION

AzraSound

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ramses

When dealing with a CommonDialog Control, I always go something like this

With cdgEd
.CancelError=True 'always usefull
.Flags = cdlPDReturnDC + cdlPDNoPageNums
If rtfDisplay.SelLength = 0 Then
.Flags = .Flags + cdlPDAllPages
Else
.Flags = .Flags + cdlPDSelection
End If
On Error Resume Next 'just for the dialog
.ShowPrinter
If Err = cdlCancel Then Exit Sub 'user pressed cancel
On Error Goto 0 'disable error handler
rtfDisplay.SelPrint .hDC
End With

This is a bit like the examples above, except that Error Handling is only enabled for the Commondialog Control when showing the Printbox.

After showing the Printbox and checking if the user presses cancel, ErrorHandling is disabled so that you can see other errors, should they occur.

Just scream 4 more ;)

jnowlin

ASKER

Thanks AzraSound,

I'm posting another question involving the common dialog control, as this project has code on it (not mine), is poorly commented and I have next to nothing for documentation on this control.

Jim