Re: Help for hDC and textcontrol.com's ActiveX Control
From: Tom Clark (tjclark_at_pc-enable.com)
Date: 02/16/05
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Date: Wed, 16 Feb 2005 08:28:57 -0800
Hi Fred & All,
I have tried using adding Active X Microsoft Forms 2.0 Image (frm20.dll) and
Microsoft Picture Clip Control v6 (picclp32.ocx) and the new error in both
cases is "Ole Error Code... unknown name"
Tom Clark
"Fred Taylor" wrote:
> Fox Controls are not "real" Windows controls, in that they don't have a
> Windows handle or anything like that. You're picturebox control would
> need to be an ActiveX control and if it is, you may need to reference the
> property as thisform.picture1.object.hDC.
>
>
> "Tom Clark" <tjclark@pc-enable.com> wrote in message
> news:1116jlasqavki8d@corp.supernews.com...
>> Hi All,
>>
>> I posted this in the wrong thread. Sorry for the repost.
>>
>> Eric den Doop suggested I take a look at TextControl.com's ActiveX
>> control
>> for print previewing MS-Word or RTF documents. I downloaded the trial
>> version and I am having a problem with the code.
>>
>> According to the Help File:
>>
>> "Text Control's PrintPage method can not only be used with printers, but
>> also with any control that has a hDC property. For instance. a PictureBox
>> can be used as a print preview window. This is done by simply assigning
>> its
>> hDC Property to Text Control's PrintDevice Property. When calling
>> PrintPage,
>> Text Control will print to the Picture Box instead of to the printer.
>>
>> This code snippet will print page 1 to a picture box named Picture1. You
>> can
>> use the PrintZoom Property to scale down the printout if the picture box
>> is
>> smaller than a full printer page:
>>
>> TXTextControl1.PrintDevice = Picture1.hDC
>> TXTextControl1.PrintZoom = 25 ' scale down to 25%
>> TXTextControl1.PrintPage 1"
>>
>> The MDIDemo sample program contains a sophisticated print preview form
>> that
>> works like this. Its source code is contained in the Samples\VB6\MDI
>> folder."
>>
>> Well I have adapted that example as best I could with the following code:
>>
>> cDoc = "c:\pcenable\rtf\jdis2.doc"
>> thisform.oTxt.Load(cDoc,,9,)
>> thisform.oTxt.PrintDevice = Picture1.hDC
>> thisform.oTxt.PrintZoom = 25 && scale down to 25%
>> thisform.oTxt.PrintPage(1)
>>
>> The code generates the following run time error "Alias 'Picture1' is not
>> found."
>>
>> I have named the image control to "Picture1" but I realize that my
>> problem
>> is that I have no idea what hDC is! Any help would be appreciated.
>>
>> TIA,
>> Tom Clark
>>
>> Bernhard Sander replied:
>>
>> "If your "Picture1" is on the same form then the above line should read:
>> thisform.oTxt.PrintDevice = THISFORM.Picture1.hDC"
>>
>> Which I tried and the new error is "Property hDC not found."
>>
>> MSDN says the following in regards to Visual BASIC:
>>
>> Syntax
>> object.hDC
>> The object placeholder represents an object expression that evaluates to
>> an object in the Applies To list.
>> Remarks
>> This property is a Windows operating environment device context handle.
>> The Windows operating environment manages the system display by assigning
>> a device context for the Printer object and for each form and PictureBox
>> control in your application. You can use the hDC property to refer to the
>> handle for an object's device context. This provides a value to pass to
>> Windows API calls.
>> With a CommonDialog control, this property returns a device context for
>> the printer selected in the Print dialog box when the cdlReturnDC flag is
>> set or an information context when the cdlReturnIC flag is set.
>> Note The value of the hDC property can change while a program is
>> running, so don't store the value in a variable; instead, use the hDC
>> property each time you need it.
>> The AutoRedraw property can cause the hDC property setting to change. If
>> AutoRedraw is set to True for a form or PictureBox container, hDC acts as
>> a handle to the device context of the persistent graphic (equivalent to
>> the Image property). When AutoRedraw is False, hDC is the actual hDC
>> value of the Form window or the PictureBox container. The hDC property
>> setting may change while the program is running regardless of the
>> AutoRedraw setting.
>> If the HasDC property is set to False, a new device context will be
>> created by the system and the value of the hDC property will change each
>> time it is called.
>>
>
>
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