Save Binary File To Database/Load Binary Data from Database to File
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It describes how to create a small application that write video data to a binary file vb6 and examines text files in a directory. For each selected text file, the application provides file attributes and the first line of content. There is an option to write information to a log file. This walkthrough uses members of the My.
FileSystem Objectwhich are available in Visual Basic. See FileSystem for more information. At the end of the walkthrough, an equivalent example is provided that uses classes from the System. Your computer might show different names or locations for some of the Visual Studio user interface elements in the following instructions. The Visual Studio edition that you have and the settings that you use determine these elements.
For more information, see Personalizing the IDE. In the Templates pane in the middle, click Windows Forms Application. Add the controls in the following table to the form, and set the corresponding values for their properties. Create a Click event handler for browseButton by double-clicking the control on the form.
The Code Editor opens. ShowDialog call opens the Browse For Folder dialog box. Write video data to a binary file vb6 the user clicks OKthe SelectedPath property is sent as an argument to the ListFiles method, which is added in the next step.
The GetFiles method then retrieves a collection of strings, one for each file in the directory. The GetFiles method accepts a search pattern argument to retrieve files that match a particular pattern. In this example, only files that have the extension. The strings that are returned by the GetFiles method are then added to the ListBox. Click the Browse button. In the Browse For Folder dialog box, browse to a folder that contains.
Create a Click event handler for examineButton by double-clicking the control on the form. The code verifies that an item is selected in the ListBox. It then obtains the file path entry from the ListBox. The FileExists method is used to check whether the file still exists. The file path is sent as an argument to the GetTextForOutput method, which is added in the next step. This method returns a string that contains file information. The file information appears in a MessageBox.
The code uses the GetFileInfo method to obtain file parameters. The file parameters are added to a StringBuilder. The first line of the contents is obtained from the StreamReader and is added to the StringBuilder.
Click Browseand browse to a folder that contains. Select a file in the ListBoxand then click Examine. A MessageBox shows the file information. The code sets the log file path to put the log file in the same directory as that of the selected file.
The text of the log entry is set to the current date and time followed by the file information. The WriteAllText method, with the append argument set to Trueis used to create the log entry. Browse to a text file, select it in the ListBoxselect the Save Results check box, and then click Examine. Verify that the log entry is written to the log. When you click Browse the first time, the Browse For Folder dialog box opens to the current directory.
The SetEnabled method enables or disables controls depending on whether an item is selected in the ListBox. The Save Results check box and the Examine button are disabled if an item is not selected in the ListBox.
The following equivalent example uses classes from the System. Write video data to a binary file vb6 namespace instead of using My. Manipulating Files by Using.
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Note Your computer might show different names or locations for some of the Visual Studio user interface elements in the following instructions. Note The feedback system for this content will be changing soon.