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Invoking Chkdsk using WMI
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| Total Hit (1222) |
Besides returning system information, the Windows Management Instrumentation classes also expose methods that can be called from VB. In addition, the WMI supports the executing of SQL-style calls to retrieve specific information.
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Obtaining Logical Disk Information using WMI
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| Total Hit (1227) |
Windows Script Host is built into Microsoft Windows 98, 2000, ME and XP. If you are running Windows 95 or NT4, you can download Windows Script Host from the Microsoft Windows Script Technologies Web site at http://msdn.microsoft.com/scripting/. Some information is not returned on non-NT-based system
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Using DeviceIoControl to Obtain Physical Drive Information
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| Total Hit (1775) |
Win NT/Win2000 developers have access to a unique API that provides low-level system information - DeviceIoControl.
This example succeeds only when it runs on Windows NT/Windows 2000/Windows XP, for two reasons:
«LI»The standard device input/output control codes are available only on Windows N
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An API 'DriveExists' Routine
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| Total Hit (1239) |
For the API purest, here's a tiny function that simply returns True if a specified drive exists, or False if not.
Using GetLogicalDriveStrings, its a simple matter of retrieving all the available drives, then performing a case-insensitive Instr() against the result to determine if the passed drive
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Using GetDiskFreeSpaceEx on 32-bit Windows
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| Total Hit (1330) |
This page presents four key wrapper routines for the data returned by the GetDiskFreeSpaceEx API. It works on both Win95 and Win95 OSR2, as well as Win98, NT4 Windows 2000 and Windows XP. By checking for the proc address of the GetDiskFreeSpaceExA API in kernel32.dll, which will only return a valid
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Simulating a TopIndex Property for a ListView
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| Total Hit (694) |
A listview control's EnsureVisible method provides a means to bring a referenced item into view. Ditto, the LVM_ENSUREVISIBLE message simply "ensures that a list-view item is either entirely or partially visible, scrolling the list-view control if necessary."
If the item of interest is back up t
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Subclassing Listview Scrollbar Messages
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| Total Hit (886) |
When it is necessary for your application to maintain synchronization between two or more Listview controls - or two or more List boxes for that matter - as the user interacts with the primary ListView's control's scrollbar, subclassing must be used in order to determine the user's interaction refle
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Using the ListView Checkbox
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| Total Hit (1158) |
By popular demand, here are several methods you can employ to perform a variety of ListView check box-related operations.
Setcheck: turns on the checkbox for the item passed as the value in the textbox.
GetChecked: displays a MsgBox with a list of currently-selected checked items and their List
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Tying a Treeview and Listview Together via the Tag Property
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| Total Hit (891) |
Unlike most of the other treeview and listview code examples here on VBnet, this one doesn't use APIs. Its creation was prompted by a newsgroup question by someone wanting to have a treeview and listview with similar items, and to behave such that when the user selected a treeview item, the correspo
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Changing a VB Toolbar to a Rebar-Style Toolbar
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| Total Hit (909) |
Here's a quick routine to set a standard VB toolbar to a IE-style Rebar style control (aka 'coolbar') for IE4 Active Desktop users. The illustration shows the original and flattened style for the same toolbar.
Place a toolbar with images (and optionally text), and add a placeholder. Set the place
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Fixing the IE5/MsComCtrl 5 Toolbar Problem
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| Total Hit (1128) |
After the introduction of IE5, users began complaining that their code, which had previously created flat toolbars, failed on systems with IE5 installed. In addition, whenever the text (caption) for a button was changed through code, and the new caption text length differed from that being replaced,
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Adding Checkboxes to a Treeview via API
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| Total Hit (1407) |
Recent newsgroup postings have asked how to mimic the Advanced Options page displayed in Internet Explorer 4. Initially I thought of using the listview with checks and indents, but after someone suggested that the items on the page were collapsible, I investigated the treeview styles. Sure enough, a
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Applying Special Effects to a TreeView
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| Total Hit (1003) |
The treeview is a special beast ... compared to the listview, in my opinion, a lot more complicated to manipulate via API. Instead of referring to items as simple indices based on order, each treeview item has an item handle, and it is this that is used when manipulating treeview items (see the cod
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Duplicating the Contents of a Treeview
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| Total Hit (1319) |
The three routines below combine to produce an effective way to duplicate a TreeView with all its data. No API is used, yet the method executes quite quickly. To maximize speed when copying large treeviews, set the receiving treeview's visible property to False before beginning the copy.
The meth
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Toggling Checkbox Visibility in a Treeview
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| Total Hit (873) |
So now that the ability to display checkboxes has been added to the application (Adding Checkboxes to a TreeView via API), there may be times when it is desirable to hide this functionality. Simply resetting the TVS_CHECKBOXES flag does not do this, as the state image icons are still attached to the
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Using the ChooseColor Common Dialog API
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| Total Hit (1421) |
Although the API uses a structure to pass parameters to the ChooseColor API, the dialog can be shown by providing just the flags, hwndOwner, lStructSize and lpCustColors members completed. Other options, such as a hook, can be added to provide additional functionality such as positioning, custom cap
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Using the GetOpenFileName Common Dialog API - Overview
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| Total Hit (1467) |
This page details the descriptions of Windows GetOpenFileName and GetSaveFileName API methods. The related demo code pages show how to call the APIs, as well as demonstrating how to retrieve the constituent parts of the file string returned.
To access both of the file common dialogs, the OPENFILEN
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Using the GetOpenFileName Common Dialog API
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| Total Hit (1258) |
This page provides the detailed code and descriptions required for the Common Dialog GetOpenFileName API, as well as showing how to retrieve the constituent parts of the file string returned.
Code comments are at a minimum here. For detailed descriptions of the OPENFILENAME structure used and the
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Using the GetSaveFileName Common Dialog API
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| Total Hit (1431) |
This page provides the code required for the Common Dialog GetSaveFileName API method. OPENFILENAME member descriptions, as well as commented code, are covered in the pages above. Except for the Flags and API name, the code is pretty well a duplicate of the GetOpenFileName code.
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Centering the Open & Save Common Dialogs Using Callbacks
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| Total Hit (1046) |
The Common Dialog API provides a simple and powerful replacement to the Common Dialog control for projects using the file open or save methods. Not burdened by the baggage of properties, the API solutions also offer a significant performance increase. And all this comes in calls that still allow man
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Centering the Open & Save Common Dialogs Using Callbacks, Advanced
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| Total Hit (1239) |
Centering the Open & Save Common Dialogs Using Callbacks showed just how simple implementing a window hook for the OPENFILENAME structure can be. Here we expand upon that same code to provide additional positioning options - centred to the screen, to the parent form, or allow the dialog to take its
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Hooking the Open & Save Common Dialogs To Manipulate Components
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| Total Hit (1422) |
Now that you're an expert at centering a common dialog using hooks its time to look at customizing other aspects of the dialog window. A frequent request is a method to set custom captions for the various buttons and static fields (labels) on the dialog. This page addresses this request.
Again the
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Determining Free Disk Space in Win95/Win98 with GetDiskFreeSpace
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| Total Hit (817) |
The routine presented here to determine a drive's available disk space will return incorrect results on volumes over 2 gigabytes, as supported by the FAT32 partitions implemented in Windows95 OEM Service Pack 2, Windows 98 (without FAT32 conversion) and NT4. See the comments section following the co
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Determining Free Disk Space on a Fat32 (or NTFS) Drive
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| Total Hit (1769) |
The routine presented here will return the correct free and used disk sizes on volumes over 2 gigabytes as supported by the FAT32 partitions implemented in Windows95 OEM Service Pack 2, aka OSR2, and in Windows 98 where the Fat32 drive conversion has been made, or on NTFS partitions on NT4, Windows
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Determining if a Floppy Drive is Ready
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| Total Hit (1188) |
Visual Basic provides a few ways to test for the readiness of a removable drive both with intrinsic methods and with the assistance of the API. Each method has its advantages.
Most developers are familiar with the first method around since VB1 - performing a simple Dir() against the drive, trappin
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