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Displaying Bitmaps as Icons in Windows' Explorer View
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| Total Hit (730) |
As the Visual Basic developer designs more and more apps that utilize tiny bitmaps for toolbars and other things, it quickly becomes apparent that keeping track of exactly what each bitmap looks like is a task in itself.
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Filling Polygonal Regions Using ExtFloodFill
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| Total Hit (1600) |
Here's a quickie one-form demo that shows how to use the ExtFloodFill API to construct a child's drawing canvas that can save and reload a picture.
When the left mouse is pressed, lines are drawn on the picturebox in response to a drag. When the right mouse is pressed, a random colour fills the in
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Manipulating Image Brightness with SetPixelV
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| Total Hit (1368) |
Here's an interesting bit of code by Tanner Helland that takes any image assigned to a picturebox and rapidly adjusts the image brightness. As the new image is displayed, it progressively wipes overtop the old image (the demo picture shows the progress half-way across the girl). This code could be e
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Obtaining Bitmap Info Without APIs
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| Total Hit (1458) |
Using binary file access, read the BITMAPFILEHEADER and BITMAPINFOHEADER structures of a file to obtain the image details.
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Mimicking the PrintScreen Function Using OLE
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| Total Hit (683) |
This code makes use of the OLE standard interface in Windows95/Windows98 to copy the contents of the desktop (the screen) into a PictureBox and save it to disk. To use this code, you must assure that the Standard OLE Types Reference to file \Windows\System\OLEPRO32.DLL is included in the project's r
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Calling the Windows PrintScreen Function Using keybd_event
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| Total Hit (703) |
The following code will copy the contents of the desktop (the screen) into a PictureBox or image control on a form.
Unlike the examples listed at the top of this page, this method uses the Windows API to actually PrintScreen to the clipboard first, and then retrieve that bitmap into the image con
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Presenting a Non-Selectable 'No Data' Picture in a ListBox
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| Total Hit (1796) |
The VBnet page Customizing the ListView's Appearance via API showed how to use SendMessage with the LVBKIMAGE structure to display images in the data window of a listview control. Although Windows' normal list box does not support such functionality, we can still fake this functionality using the B
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Tiling an Image Across a Form
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| Total Hit (933) |
How to tile an image across the background of any form (except MDI parents). No APIs needed.
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Browsing in Win32/NT4 - An Overview
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| Total Hit (1797) |
Details on the ITEMIDLIST, SHITEMID, BROWSEINFO structures, and the SHGetSpecialFolderLocation, SHGetPathFromIDList and SHBrowseForFolder APIs.
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Browse for Folders Callback Overview
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| Total Hit (1630) |
Windows' Browse for Folders dialog provides the means to retrieve from a user their selection of the Shell's file system and special folders. The following and related code page discuss adding callback functionality to a VB5 application to provide the ability to pre-select a folder on the dialog's d
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How to check NULL value in .net ?
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| Total Hit (2984) |
IsNull() function of VB6 is not supported in VB.net to check NULL value but there is alternate way to do that
«Code LangId=2»
If rs("Myfield") IS System.DBNull.Value Then
Msgbox("It is NULL")
Else
Msgbox("It is not NULL")
End if«/Code»
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SQL LiteSpeed 3.0 -- The Smarter DBA's Backup
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| Total Hit (894) |
For almost two years, DBassociatesIT has produced SQL LiteSpeed, an alternative to SQL Server's native backup and restore commands, offering greater security, faster backup and restore speed, and smaller backup files resulting in significantly reduced storage costs. With the introduction of SQL Lite
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Pre-selecting a Folder using the Browse Callback
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| Total Hit (1605) |
Add a callback routine to your VB5/6 code to allow pre-selecting of a file system object when displaying the Browse for Folders dialog. Added version-detecting code and necessary changes to allow the String method to function on NT
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Enumerating the Available Display Resolutions
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| Total Hit (1771) |
This routine uses Windows' EnumDisplaySettings API to retrieve all the available screen resolutions supported by the display. The results are populated to a ListView showing colour depths, resolutions and frequencies supported. In addition, the current system resolution is determined and flagged.
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Changing the Display Resolution from Visual Basic
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| Total Hit (1316) |
This routine, like the ListView method in Enumerating the Available Display Resolutions, uses Windows' EnumDisplaySettings API to retrieve all the available screen resolutions supported by the display. Here, the results are used to create a "QuickRes-style menu", replete with the option of displayin
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Using CopyFileEx and Callbacks as a File Backup Mechanism
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| Total Hit (1449) |
So that's how you do it!" This demo shows how to add a callback to the CopyFileEx API that returns the progress of a copying routine. But there is a catch ... CopyFileEx is only available on real operating systems - AKA Windows NT.
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Enumerating Windows Fonts by Type
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| Total Hit (970) |
This page shows the code required to add to a listbox only the specifictypes of fonts desired. Windows supports four font type - Vector (such as Modern), Raster (MS Sans Serif), Device-Specific (such as PostScript), and TrueType
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Enumerating Windows Fonts with Preview
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| Total Hit (1364) |
This is the code required to enumerate the system fonts into a listbox using a callback routine, and provide a sizeable preview of the font selected.
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Obtaining AVI File Information via API
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| Total Hit (2584) |
This routine shows a couple of things. First and foremost, it details how to retrieve AVI file information from the AVI file using the AVIFileOpen the AVIGetFileInfo APIs. It also shows how to populate a ListView with this information, how to determine the Time Scale for the AVI, and how to use this
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Mulltiple File Upload - Hotmail Style
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| Total Hit (1101) |
Demonstrates how to upload multiple files using one HttpInputFile control - Hotmail style! The Input type=file allows a user to select only one file at a time thereby forcing a developer to use multiple Input type=file on a page.
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VB Programmer's AVIFile Function Help Pages
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| Total Hit (1268) |
Windows contains a powerful set of video file functions called the AVIFile API ('Application Programming Interface'). The AVIFile API set of functions is part of an even larger API called the Video For Windows API. It is possible to use the AVIFile functions from Visual Basic. However, the lack o
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Creating a Transparent Bitmap
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| Total Hit (1602) |
Start a new project, and to the form add two controls - a single command button and a single PictureBox containing the picture to make transparent (Source), as shown in the illustration. The 'Transparent Result' in this example is displayed on the form's hdc, not in another picture or image control.
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