How to open a file in visual basic

04.06.2021 By Tauzshura

how to open a file in visual basic

Let users pick a file to open via OpenFileDialog in VB.NET

Feb 16, This macro is written in Visual Basic Editor. In order to open a file, the location address of the file is given. When you write your code, give the full file location of your Excel file. For instance, if your file is store in My Documents, give file address as C:\MyDocuments/ Oct 27, Opening a Text File in Visual Basic The first step in working with files in Visual Basic is to open the file. This is achieved using the Visual Basic FileStreamclass. The FileStreamconstructor accepts the file name to be opened as the first parameter, followed by a number of other parameters defining the mode in which the file is to be Creates a new file, removing old file if it already exists.

Whenever you need to allow a user to open a particular file without forcing the user to type the full path and file name, you can use the OpenFileDialog class. OpenFileDialog has a number of properties and methods that make it a flexible way to get users to pick a file.

For my example, I will also add a textbox and a command button to the form. To do so, change the text property of the command button to Open File and add the following code to the button's click event and to the FileOK event of the OpenFileDialog box:. Object, ByVal e As System. I begin by setting the Title property of the OpenFileDialog on.

Then, I set the initial directory that will open the first time the dialog box opens up. The user can change it vsual any directory in run time. I open the file that the user selected and then close it. You can use the functionality provided here to open the selected file or to store the name of the file that was selected, depending on the purpose of your particular application.

Irina Medvinskaya has been involved in technology since Advance your scripting skills to the next level with TechRepublic's free Visual Basic newsletter, delivered each Friday. Automatically subscribe today! To add the control to your form, double-click it, and the component will appear below the form as in Figure A.

Figure A Candy crush level 79 how to beat it my example, I will also add a textbox and a command button to the form.

EventArgs Handles Button1. Click OpenFileDialog1. FileOk Dim strm As System. OpenFile TextBox1. Close MessageBox. Figure C. Editor's Picks. Ten Windows 10 network commands everyone one should know. Top 5 ways to protect against cryptocurrency scams. IBM reaffirms support for open-source devs after internal Vjsual kernel maintainer argument goes public.

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So to start with this tutorial, open first a visual basic and create a project named FileHandling. Then on the form, add a MenuStrip from a toolbox, and a RichTextBox. Next, were going to add a menu to our menu strip such as File and under File, add Open as . Navigate to the folder containing the Excel workbook you want to open. Select the file to be opened and click on the Open button in the lower-right corner of the Open dialog. The FileStream Class. The FileStream class in the namespace helps in reading from, writing to and closing files. This class derives from the abstract class Stream. You need to create a FileStream object to create a new file or open an existing file. The syntax for creating a FileStream object is as follows ?. Dim As FileStream = New FileStream(file_name>.

One of the most basic and common operations in Excel is opening a workbook. Regardless of their level beginner or advanced , virtually every single Excel user has to constantly open workbooks. In fact:. If you're working with VBA, it's only a matter of time before you need to start creating macros to open Excel workbooks.

This Excel tutorial focuses on this basic and common Excel operation :. I cover this topic by explaining 2 of the most basic macros you can use to open an Excel workbook. You can get immediate free access to this example workbook by clicking the button below. Therefore, the second part of this tutorial analyzes both of these methods and goes through each of their parameters. The purpose of this section is to help you get some basic awareness of some of the things you can do when using these methods in your macros.

In addition to help you open workbooks using VBA, the Application. GetOpenFilename method allows you to specify the paths and names of particular Excel workbooks. You'll likely encounter situations where knowing this how to allow the user to specify a path and filename can come in handy. And let's start by taking a look at what is, perhaps, the simplest case of opening an Excel workbook using VBA:. Open method. The Workbooks.

Open method has 15 optional arguments. Each of these 15 optional arguments allows you determine a different aspect of how the Open method opens an Excel workbook. Since taking a look at 15 arguments at once can get a little overwhelming, let's start by taking a look at the most basic case: opening an Excel workbook whose name you know. You specify which workbook you want to open by using the Filename argument. More specifically, the basic VBA statement syntax to open a particular workbook is :.

As shown in the example below, when specifying the workbook's file name, you must provide the full path and name of the file. I explain how to make this easier below. For the reasons that I explain here , this is my preferred syntax. This workbook is saved in the D drive. As mentioned above, notice that when specifying the filename, you must provide the whole file path, name and extension. The sample file path above is relatively simple.

In particular, there's no need to go through several sub-folders in order to get to the sample workbook. Probably not many people are able to remember the exact file paths, names and extensions for the files in their laptop.

And even then, few would want to type the whole thing every time a new Excel workbook is to be opened. In other words: Having the user type the filename without browsing is both:. Let's take a look at the simplest way to do this: replicating the way Excel usually works when you browse the computer drive in order to find the particular file you want to open. This is the Open dialog box. Excel displays this dialog whenever you browse for purposes of finding and selecting a file to open.

You'll probably agree with me that using this method of choosing the particular Excel workbook that you want to open is much easier than remembering the full file path. Fortunately, you can replicate this way of operating with VBA.

More precisely, you do this by using the Application. GetOpenFilename method. The Application. GetOpenFilename method doesn't open the file chosen by the user. You still need to rely on the Workbooks. Open method explained above for purposes of actually opening the chosen file.

The fact that GetOpenFilename doesn't actually open the file makes this a very versatile method. Therefore, in order to open an Excel workbook through the Open dialog box while using VBA, you need to use both of the following methods:.

GetOpenFilename method has 5 variables. However, just as we did with the Workbooks. Open method, let's take a look at a very basic piece of VBA code that allows you to:. This particular statement is a variable declaration statement.

The purpose of declaring a variable in this macro is to store the file name chosen by the user. As I explain in this macro tutorial , the Dim statement is the most common way to declare a VBA variable. This variable is declared as a Variant because the Application.

GetOpenFilename method can return different types of data. For purposes of carrying out a closer examination of this statement, I divide it in the following 3 items:. Therefore, it doesn't represent an equality.

This item is the reference to the Application. As explained above, this particular method:. FileFilter is one of the different parameters of the GetOpenFilename method. As implied by its name, this argument allows you to specify criteria for file-filtering. It's an optional argument. However, I include it for purposes of specifying file filtering criteria. In the sample VBA code that appears above and throughout the rest of this Excel tutorial , I use named arguments.

However, that's not mandatory. If you don't want to use named arguments, you can use the following statement syntax:. As explained above, FileFilter determines what are the criteria used for filtering files when the Open dialog box is displayed. In more practical terms, the FileFilter argument determines what appears in the Files of type drop-down list box on the lower-right corner of the Open dialog box.

The appropriate syntax of the FileFilter Argument is determined by the following rules :. The purpose of the Workbooks. Open method is to open an Excel workbook. In other words, if the user selects a file when the Open dialog box is displayed, the If Then Else statement opens that file. As explained at the beginning of this Excel tutorial, Workbooks. Open is the method that you'll generally use to open Excel workbooks using VBA.

We have already seen the basics of the Workbooks. Open method and its most basic use above. However, in that particular case, I mentioned that this method has 15 different parameters. So far, we've only checked one: FileName. I assume that, if you're reading this, you want to learn about some more advanced cases of opening Excel workbooks using VBA.

In order to do this, let's take a closer look at the Workbooks. Open method and its different parameters. The full syntax of the Workbooks. Open method in Visual Basic for Applications is as follows:. All of the parameters of the Workbooks. Open method, which appear within parentheses above, are optional. Let's take a look at them! Determines the delimiter character. Determines whether the read-only recommended message is displayed.

Indicates where the file originated. Specifies what is the custom character to be used as delimiter. If applied to a template, determines whether template is opened for editing, or if a new workbook based on the template is created.

Determines whether file is added to file notification list or no notification is requested. The only exception is the FileName argument, which I explain above. The UpdateLinks argument is the one you can use if you're interested in determining whether the external references or links within the opened Excel workbook are or aren't updated. In other words, UpdateLinks determines how those external references or links are updated.

The UpdateLinks parameter can take the following 2 values :. Since the UpdateLinks parameter isn't required, you can omit it. In that case, Excel generally defaults to asking the user how links are updated. If you set the ReadOnly argument to True, the Excel workbook is opened in read-only mode. In this case, the Excel workbook is opened as read-only, meaning that any changes made aren't saved. Check out, for example, the screenshot below:. The Format argument of the Workbooks.

Open method is only relevant when opening text files.