convert pdf to tiff programmatically c#: Creating a secure pdf document SDK software service wpf winforms asp.net dnn microsoft_visual_basic_black

Visual Basic 6 Black Book:Creating Code Components (OLE Automation)

property.

Let’s see an example. Here’s some code that might appear in an in-process code

component that displays a dialog box. If the application supports access to its message

loop, we can show the dialog box, Form1, as modeless by passing the constant

vbModeless to the Show method:

Public Sub ShowForm()

If App.NonModalAllowed Then

Form1.Show vbModeless

...

Otherwise, you should display the dialog box as modal:

Public Sub ShowForm()

If App.NonModalAllowed Then

Form1.Show vbModeless

Else

Form1.Show vbModal

End If

End Sub

Designing Multithreaded In-Process Components

At the beginning of this chapter, we discussed some thread serialization concerns for

code components; in particular, we saw that to avoid blocked threads, you can use

multithreaded code components. We’ll see how that works for in-process components

in this topic and take a look at out-of-process components in the next topic.

To make an in-process code component multithreaded, select the Project|Properties

menu item and click the General tab. For ActiveX DLLs, you can select two options in

the Threading Model box: Single Threaded or Apartment Threaded. Selecting

Apartment Threaded makes the in-process code component multithreaded.

TIP: Set the threading model before you add controls to your project. When you

change the threading model for an existing project, errors will occur if the project

uses single-threaded ActiveX controls. Visual Basic doesn’t allow the use of single-

threaded controls in apartment-threaded projects.

Designing Multithreaded Out-Of-Process Components

At the beginning of this chapter, we discussed some thread serialization concerns for

code components; in particular, we saw that to avoid blocked threads, you can use

multithreaded code components. We saw how that worked for in-process components

file:///E|/Program%20Files/KaZaA/My%20Shared%...Basic%20-%20%20Black%20Book/ch27/960-964.html (3 of 4) [7/31/2001 9:05:51 AM]

Creating a secure pdf document - C# PDF Digital Signature Library: add, remove, update PDF digital signatures in C#.net, ASP.NET, MVC, WPF

Help to Improve the Security of Your PDF File by Adding Digital Signatures

pdf security settings; decrypt pdf with password

Creating a secure pdf document - VB.NET PDF Digital Signature Library: add, remove, update PDF digital signatures in vb.net, ASP.NET, MVC, WPF

Guide VB.NET Programmers to Improve the Security of Your PDF File by Adding Digital Signatures

change security settings on pdf; decrypt pdf password

Visual Basic 6 Black Book:Creating Code Components (OLE Automation)

in the previous topic. In this topic, we’ll take a look at out-of-process components.

To make an out-of-process code component multithreaded, select the Project|Properties

menu item and click the General tab. For ActiveX EXEs, you can select two options in

the Threading Model box: Thread Per Object or Thread Pool.

To make the project multithreaded, you can specify that each new object is created on a

new thread with the Thread Per Object option, or you can limit your component to a

fixed pool of threads by setting up a thread pool. A thread pool size of 1 makes the out-

of-process code component single-threaded, whereas a larger thread pool makes the

project apartment-threaded.

TIP: Set the threading model before you add controls to your project. When you

change the threading model for an existing project, errors will occur if the project

uses single-threaded ActiveX controls. Visual Basic doesn’t allow the use of single-

threaded controls in apartment-threaded projects.

Table of Contents

Products |

About Us |

Privacy |

Ad Info |

Home

Use of this site is subject to certain

Terms & Conditions,

permission of

EarthWeb is prohibited.

file:///E|/Program%20Files/KaZaA/My%20Shared%...Basic%20-%20%20Black%20Book/ch27/960-964.html (4 of 4) [7/31/2001 9:05:51 AM]

C# Create PDF Library SDK to convert PDF from other file formats

C#.NET PDF document file creating library control, RasterEdge XDoc for C# developers to create a highly-secure and industry-standard PDF document file.

create encrypted pdf; convert secure webpage to pdf

C# Word - Word Creating in C#.NET

C#.NET Word document file creating library control, RasterEdge XDoc for C# developers to create a highly-secure and industry-standard Word document file

pdf security password; change pdf document security

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

Click Here!

ITKnowledge

home

account

info

ITKnowledge

FAQ/help

site

map

Brief

Full

Advanced

Search Tips

To access the contents, click the chapter and section titles.

Visual Basic 6 Black Book

(Publisher: The Coriolis Group)

Author(s): Steven Holzner

ISBN: 1576102831

Publication Date: 08/01/98

Bookmark It

Search this book:

Table of Contents

Chapter 28

Advanced Form, Control, And Windows

Registry Handling

If you need an immediate solution to:

Passing Controls To Procedures

Passing Control Arrays To Procedures

Determining The Active Control

Determining Control Type At Runtime

Creating/Loading New Controls At Runtime

Changing Control Tab Order

Changing Control Stacking Position With Z-Order

Drag/Drop: Dragging Controls

Drag/Drop: Dropping Controls

Handling “Self-Drops” When Dragging And Dropping

Drag/Drop: Handling DragOver Events

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0965-0970.html (1 of 5) [7/31/2001 9:05:53 AM]

Go!

Keyword

Please Select

Go!

C# PowerPoint - PowerPoint Creating in C#.NET

C#.NET PowerPoint document file creating library control, RasterEdge developers to create a highly-secure and industry-standard PowerPoint document file

pdf password unlock; secure pdf remove

C# Word - Word Create or Build in C#.NET

approach for C# developers to create a highly-secure and industry a Word document in C#.NET using this Word document creating toolkit, if Create Word From PDF.

pdf file security; decrypt pdf online

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

OLE Drag/Drop: Dragging Data

OLE Drag/Drop: Dropping Data

OLE Drag/Drop: Reporting The Drag/Drop Outcome

Using The Lightweight Controls

Passing Forms To Procedures

Determining The Active Form

Using The Form Object’s Controls Collection

Using the Forms Collection

Setting A Form’s Startup Position

Keeping A Form’s Icon Out Of The Windows 95 Taskbar

Handling Keystrokes In A Form Before Controls Read Them

Making A Form Immovable

Showing Modal Forms

Saving Values In The Windows Registry

Getting Values From The Windows Registry

Getting All Registry Settings

Deleting A Registry Setting

In Depth

This is our chapter on advanced form and control techniques—and working with the

Windows Registry. We’ll see many new techniques here, including dragging and

dropping controls (and even how to drag and drop the data in controls, using OLE drag

and drop). Programmers are often surprised when an advanced technique doesn’t work

in the same way that a basic technique does in Visual Basic. For example, a

programmer might want to pass a control array to a procedure—and immediately run

into problems because that process doesn’t work the same way as passing a normal

array to a procedure. Here’s how you pass a normal array to a procedure; first, you set

up the array this way where we set up an integer array named intArray :

Private Sub Form_Load()

Dim intArray(4) As Integer

intArray(0) = 0

intArray(1) = 1

intArray(2) = 2

intArray(3) = 3

intArray(4) = 4

...

Then you pass the array to a procedure named, say, ShowValues, by specifying the

name of the array with empty parentheses:

Private Sub Form_Load()

Dim intArray(4) As Integer

intArray(0) = 0

intArray(1) = 1

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0965-0970.html (2 of 5) [7/31/2001 9:05:53 AM]

C# Excel - Excel Creating in C#.NET

C#.NET Excel document file creating library control, RasterEdge XDoc C# developers to create a highly-secure and industry-standard Excel document file.

pdf security; decrypt pdf file online

XDoc.HTML5 Viewer for .NET, All Mature Features Introductions

By creating, loading, and modifying annotations, you can for text selecting in order to secure your web & profession imaging controls, PDF document, image to

add security to pdf document; decrypt pdf

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

intArray(2) = 2

intArray(3) = 3

intArray(4) = 4

ShowValues intArray()

End Sub

In the procedure, you can work with the passed array as a normal array like this:

Private Sub ShowValues(TargetArray() As Integer)

For Each intValue In TargetArray

MsgBox intValue

End Sub

TIP: You can even pass variable-length arrays of parameters to procedures using the

ParamArray keyword.

Extrapolating the preceding technique to control arrays, you might think that you’d

pass a control array to a procedure in the same way. For example, if you had an array

of command buttons named CommandArray, you might think you can pass it to a

procedure, SetCaption, like this:

Private Sub Form_Load()

SetCaption CommandArray()

End Sub

In the SetCaption procedure, you’d want to work with the control array as with a

normal array, as in this case where we change the caption of each button to “Button”:

Private Sub SetCaption(TargetControl() As Control)

For Each ButtonObject In TargetControl

ButtonObject.Caption = "Button"

End Sub

However, it doesn’t work like that—in many ways, control arrays are really treated in

Visual Basic like objects, not normal arrays. What that means here is that you have to

pass the control array as an object (without the parentheses), like this:

Private Sub Form_Load()

SetCaption CommandArray

End Sub

Then in the procedure, you declare the control array as an Object, not as an array of

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0965-0970.html (3 of 5) [7/31/2001 9:05:53 AM]

VB.NET Word: VB Tutorial to Convert Word to Other Formats in .NET

But if you want to share the Word information with others across platforms, then converting Word to a more secure document format PDF will be greatly favored.

secure pdf file; pdf secure

PDF Image Viewer| What is PDF

software; Open standard for more secure, dependable electronic version among a suite of PDF-based standards to develop specifications for creating, viewing, and

change security settings pdf reader; pdf unlock

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

type Control. However, you can treat it as an array like this:

Private Sub SetCaption(TargetControl As Object)

For Each ButtonObject In TargetControl

ButtonObject.Caption = "Button"

End Sub

This is the kind of technique we’ll take a look at in this chapter—programming topics

that might cause trouble unless you know the ins and outs of the situation. In addition,

we’ll take a look at two other broad programming areas: dragging and dropping

controls, and working with the Windows Registry.

Drag And Drop And OLE Drag And Drop

One of the techniques we’ll take a look at is dragging and dropping controls. We’ve

seen this technique in a few places in the book already, but we’ll make our examination

of this topic systematic in this chapter. We’ll see how to let the user drag and drop

controls using the mouse. Users have only to press the mouse button over a control to

start the process, and they can drag and drop controls in our applications as they like.

This ability allows them to customize those applications.

Besides dragging and dropping controls in an application, it’s recently become popular

to be able to drag data between applications. We’ll see how to do that here with OLE

drag operations, which will let us drag data between the controls in our application, or

to another application entirely; for example, we’ll see how to let the user drag text

directly from a text box in our program to another text box—or to a word processor

like Microsoft Word.

The Windows Registry

Another popular aspect of Windows programming these days is the Windows Registry,

a built-in part of Windows that provides long-term storage for program settings. For

example, you can save the file names the user has most recently opened in a Most

Recently Used (MRU) list at the bottom of the File menu. You can also store other

settings for the program, such as window size and location, and use them when the

program starts again.

That’s it for the overview of what’s in this chapter—now it’s time to turn to the

Immediate Solutions section for advanced form, control, and Windows Registry

handling.

Immediate Solutions

Passing Controls To Procedures

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0965-0970.html (4 of 5) [7/31/2001 9:05:53 AM]

VB.NET Word: How to Convert Word Document to PNG Image Format in

document formats, including converting Word to PDF in VB password can't be removed from the Word document. is equipped with a more secure document protection by

convert locked pdf to word doc; copy text from encrypted pdf

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

One easy way to handle a large number of controls is to set up a procedure that handles

the controls in a generic way and pass the controls to that procedure. How do you pass

a control to a procedure? You just declare it as type Control in the argument list of the

procedure you’re passing it to.

Table of Contents

Products |

About Us |

Privacy |

Ad Info |

Home

Use of this site is subject to certain

Terms & Conditions,

permission of

EarthWeb is prohibited.

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0965-0970.html (5 of 5) [7/31/2001 9:05:53 AM]

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

ITKnowledge

home

account

info

ITKnowledge

FAQ/help

site

map

Brief

Full

Advanced

Search Tips

To access the contents, click the chapter and section titles.

Visual Basic 6 Black Book

(Publisher: The Coriolis Group)

Author(s): Steven Holzner

ISBN: 1576102831

Publication Date: 08/01/98

Bookmark It

Search this book:

Table of Contents

Let’s see an example. Here, we’ll pass a command button, Command1, to a procedure,

SetCaption, to set that button’s caption to “Button” when the form containing the

button first loads:

Private Sub Form_Load()

SetCaption Command1

End Sub

In the SetCaption procedure, you declare the passed button as type Control:

Private Sub SetCaption(TargetControl As Control)

TargetControl.Caption = "Button"

End Sub

And that’s it—now we’re passing controls to procedures.

Passing Control Arrays To Procedures

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0970-0974.html (1 of 5) [7/31/2001 9:05:57 AM]

Go!

Keyword

Please Select

Go!

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

It’s reasonable to think that control arrays are really arrays, but in fact, you sometimes

have to treat them as objects, not arrays (which is why you can create event handlers

for control arrays—something you certainly couldn’t do if they were just Visual Basic

arrays). For example, when you want to pass a control array to a procedure, you pass it

as an Object, not an array of type Control.

Let’s see an example. Here, we pass a control array of buttons, CommandArray, to a

procedure, SetCaption (note that you omit the empty parentheses after

CommandArray, which you would include if that array were a normal array and not a

control array):

Private Sub Form_Load()

SetCaption CommandArray

End Sub

Now in SetCaption, we declare the passed array as type Object:

Private Sub SetCaption(TargetControl As Object)

End Sub

Then we can use the passed control array as we would any control array; here we set

the caption of each command button in the array to “Button”:

Private Sub SetCaption(TargetControl As Object)

For Each ButtonObject In TargetControl

ButtonObject.Caption = "Button"

End Sub

That’s it—now we can pass control arrays to procedures.

Determining The Active Control

The Testing Department is on the phone again. How about letting the user customize

your program by clicking a control and then selecting a menu item to, say, set the

control’s background color? Well, you say, how do I know which control the user has

clicked before using the menu item? Use the ActiveControl property, they say.

The ActiveControl property of forms indicates which control on the form is currently

active. Using this property, you can determine which control currently has the focus.

TIP: Besides forms, the Screen object also has an ActiveControl property, so if you

have a number of forms, you can determine the active control with the Screen

object’s ActiveControl property.

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0970-0974.html (2 of 5) [7/31/2001 9:05:57 AM]

Visual Basic 6 Black Book:Advanced Form, Control, And Windows Registry Handling

Let’s see an example. In this case, when the user clicks the form, we’ll set the active

control’s Caption property to “Active Control”:

Private Sub Form_Click()

ActiveControl.Caption = "Active Control"

End Sub

The result of this code appears in Figure 28.1, where we indicate the active control

when the user clicks the form.

Figure 28.1 Indicating the active control in a form.

There’s a problem with this code, however—the form might contain all kinds of

controls, some of which (like text boxes) don’t even have a Caption property. If the

user clicks the form when one of those controls is the active control, an error will

result. To fix this potential problem, we can check the type of the active control before

working with it, and we’ll see how to do that in the next topic.

Determining Control Type At Runtime

In the previous topic, we set the caption of the currently active control (that is, the

control with the focus) to “Active Control” when the user clicked the form, but realized

there was a problem if the active control was one that didn’t have a Caption property.

To determine what type of control you’re working with at runtime, you can use

TypeOf keyword, which you can use to determine the type of any object. At first, it

seems odd that you might not know what kind of control you’re working with, but

cases like the current one—where we’re using the control now stored in the form’s

ActiveControl property—are very common in Visual Basic programming.

In the previous topic, we set the caption of the active control when the user clicked the

form like this:

Private Sub Form_Click()

ActiveControl.Caption = "Active Control"

End Sub

Now we can add code to check the active control’s type (possible types for Visual

Basic controls include CommandButton, CheckBox, ListBox, OptionButton,

HScrollBar, VScrollBar, ComboBox, Frame, PictureBox, Label, TextBox, and so

on) this way, making sure the active control is a command button before changing its

caption:

file:///E|/Program%20Files/KaZaA/My%20Shared%...sic%20-%20%20Black%20Book/ch28/0970-0974.html (3 of 5) [7/31/2001 9:05:57 AM]

Documents you may be interested

convert pdf to tiff programmatically c# : Creating a secure pdf document SDK software service wpf winforms asp.net dnn microsoft_visual_basic_black_book99-part983