Article ID: 148632
Article Last Modified on 1/19/2007
APPLIES TO
- Microsoft Access 95 Standard Edition
- Microsoft Access 97 Standard Edition
This article was previously published under Q148632
SUMMARY
Advanced: Requires expert coding, interoperability, and multi-user skills.
This article shows you how to use the Windows 32-bit application programming interface (API) ShellExecute() function to start an application associated with a given file extension without having to know the name of the associated application. For example, you can start Microsoft Paint by passing the file name Bubbles.bmp to the ShellExecute() function. Or, you can connect to the World Wide Web (by using a Web browser installed on your computer) by passing a hyperlink or URL (Uniform Resource Locator) to the API function.
NOTE: Microsoft Access 97 has this functionality built in.
This article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to the "Building Applications with Microsoft Access for Windows 95" manual.
MORE INFORMATION
To use the Windows API ShellExecute(), you must first declare the function in a standard Visual Basic for Applications module. After you have declared the function, you can use the function by following one of the two examples described later in this article.
Declaring the Windows API ShellExecute()
- Open the sample database Northwind.mdb and create a new module named Module1.
Add the following code to the Declarations section:
Option Explicit Declare Function ShellExecute Lib "shell32.dll" Alias _ "ShellExecuteA" (ByVal Hwnd As Long, ByVal lpOperation _ As String, ByVal lpFile As String, ByVal lpParameters _ As String, ByVal lpDirectory As String, ByVal nShowCmd _ As Long) As Long Global Const SW_SHOWNORMAL = 1
- Close and save Module1.
To test the ShellExecute() function, use one of the following examples.
Example 1: How to Connect to the World Wide Web
NOTE: This functionality is built in to Microsoft Access 97.
Create a new table with the following structure:
Table: WebSites ------------------------------- FieldName: SiteID DataType : AutoNumber Indexed: Yes (No Duplicates) FieldName: SiteURL DataType : Text
Save the table as WebSites and switch the table to Datasheet view. Enter the following three records:
SiteID SiteURL ---------------------------------------- 1 ftp.microsoft.com 2 www.microsoft.com/kb.htm 3 http://www.microsoft.com/devonly
- Use the AutoForm: Columnar Wizard to create a new form based on the WebSites table.
- Switch the form to Design view and add the following command button:
Command button:
Name: cmdConnect
Caption: Connect to Web Set the cmdConnect button's OnClick property to the following event procedure:
Private Sub cmdConnect_Click() On Error GoTo cmdConnect_Click_Error Dim StartDoc As Long If Not IsNull(Me!SiteURL) Then StartDoc = ShellExecute(Me.Hwnd, "open", Me!SiteURL, _ "", "C:\", SW_SHOWNORMAL) End If Exit Sub cmdConnect_Click_Error: MsgBox "Error: " & Err & " " & Error Exit Sub End Sub
- Switch the form to Form view.
- Click the Connect To Web button. Note that your Web browser is started automatically and displays the Web site for the URL listed in the current record.
Example 2: How to Open a File in Its Associated Application
Open Module1 and create the following procedure:
Function StartDoc (DocName As String) On Error GoTo StartDoc_Error StartDoc = ShellExecute(Application.hWndAccessApp, "Open", DocName, _ "", "C:\", SW_SHOWNORMAL) Exit Function StartDoc_Error: MsgBox "Error: " & Err & " " & Error Exit Function End Function
- On the View menu, click Debug Window.
- In the Debug window, type the following line, and then press ENTER:
StartDoc "Bubbles.bmp"
NOTES
- The Windows API ShellExecute() function differs from the Visual Basic Shell() function in that you can pass the ShellExecute() function the name of a document, and it will start the associated application, and then pass the file name to the application. You can also specify the working folder for the application.
- The return value for the StartDoc() function is the same as for the Shell() function. It is the Windows instance value of the application that was started.
REFERENCES
For information about using the Windows 16-bit API ShellExecute() function in Microsoft Access version 2.0, please see the following article in the Microsoft Knowledge Base:
121157 How to Start Doc with Windows API ShellExecute() Function
For more information about the ShellExecute() function, please see the Microsoft Win32 SDK "Programmer's Reference."
Keywords: kbhowto kbprogramming KB148632