Read And Write Text File Visual Basic

How to read simple text files. Written By The. VBProgramer. Here is the code to read a text file from disk one line at a time into a string. This code ensures the file exists and properly closes the file if an exception occurs. Read Text File into string Using Classic Visual Basic VB6 VB6 Read Text FileWith this artcle, I am going to explain various ways we can Read Text File into a. Computer Courses. Home Beginners Computing Android App Programming Microsoft Word Microsoft Excel Excel VBA Programming for Beginners Visual Basic. NET. This tutorial describes how you can read text files in different formats and display them in your Visual Basic application. The samples here simply print the output to the main form, but this can easily be modified to do more advanced things with the text files. Req. Test. Harness. Since this tutorial uses a framework to test all the code in and sample text files it is probably easier to first Download the source code for it than follow along with the tutorial. Visual Basic provides the. Files that must be read in the same order in which they were written one after the other with no skipping aroundbinary files unstructured files which are read from or. These three file types are. Visual Basic and its predecessors QBasic, GW BASIC. The next several topics address VBs sequential file processing. Binary and Random files will be covered in later topics. The following sequential. Open. Prepares a file to be. VB program. App. Path. Supplies the path of your. Free. File. Supplies a file number. Input Reads fields from a. Line Input Reads a line up to the. EOFTests for end of file. Write Writes fields to a. Print Writes a formatted line of. Close Closes a file. As you know, a data file. Read Write Excel files in C tutorial shows how to write to and read from Excel file from your application sample CSharp source codes. To write to a text file, you use the StreamWriter instead of the StreamReader. Its used in the same way, though System. IO. StreamWriter objWriter objWriter new. The ReadAllText method of the My. Computer. FileSystem object allows you to read from a text file. The file encoding can be specified if the contents of the file use an. The file that will be used for. Field. Data Type. Department Number. Integer. Job Title. String. Hire Date. Date. Hourly Rate. Single. Suppose there were five. A graphic representation of the file populated with the. TNBlogsFS/BlogFileStorage/blogs_msdn/bethmassi/WindowsLiveWriter/InteroptoVBAFunctionsFromYourVisualStudi_A978/image_14.png' alt='Read And Write Text File Visual Basic' title='Read And Write Text File Visual Basic' />DataMember, DataSource, DragIcon, DragMode, Enabled, Font, FontBold, FontItalic, FontStrikethru, FontUnderline, FontName, FontSize, Height, Width, HelpContextID, Index. Is there a method to verify that a file is open The only thing I can think of is the TryCatch to see if i can catch the fileopen exception but I figured that a. Tips Visual Basic The File System Object FSO enables you to manipulate the files, folders and drives as well as read and write to. Employee Name. Dept Job Title. Hire Date. Hourly Rate. ANDY ANDERSON1. 00. PROGRAMMER341. 99. BILLY BABCOCK1. 10. SYSTEMS ANALYST21. CHARLIE CHEESEMAN1. COMPUTER OPERATOR311. DARLENE DUNCAN2. 00. RECEPTIONIST1. 01. ERNIE EACHUS3. 00. MAIL ROOM CLERK81. Please note that the data. On the sequential file, all fields will be represented. Following are three. Ab Soul Control System Zip. Notepad, this is what you might see. Scenario. 1 Comma Delimited Format. Each field is separated by a. Both string and numeric fields are trimmed contain no. String fields are enclosed in quotes Note The. VB and other applications that. The only time a string field MUST be enclosed in quotes is. If Date fields are enclosed in pound signs. VB will automatically recognize the field as the Date data type. If the. Date fields are enclosed in quotes instead, you need to use the CDate. Date data type. BILLY BABCOCK,1. SYSTEMS. ANALYST,21. CHARLIE CHEESEMAN,1. COMPUTER. OPERATOR,311. DARLENE. DUNCAN,2. RECEPTIONIST,1. ERNIE EACHUS,3. MAIL ROOM CLERK,81. Scenario. 2 Fixed Width Print FormatIn some sequential data. On each record, a particular. In a print format file, each line record of the file. In the example below, a. From the example, it should. BILLY. BABCOCK 1. SYSTEMS ANALYST 21. Switch Max Arabic Download more. CHARLIE. CHEESEMAN 1. COMPUTER OPERATOR 311. DARLENE. DUNCAN 2. RECEPTIONIST 1. ERNIE. EACHUS 3. MAIL ROOM CLERK 81. Scenario. 3 Fixed Width COBOL Style Format1 1 2 2 3 3 4 4 5 5 6. BILLY. BABCOCK 0. SYSTEMS ANALYST 0. CHARLIE. CHEESEMAN 0. COMPUTER OPERATOR0. DARLENE. DUNCAN 0. RECEPTIONIST 1. ERNIE. EACHUS 0. MAIL ROOM CLERK 0. VB Statements and. Functions for Sequential File Processing. The Open Statement. The Open statement prepares. VB program. It identifies the Windows system. The. general format is Open. For mode As lt filenumber. Windows system filename, which may. Open statement. as either a string constant or a string variable. Input. Output, or Append. When a file is opened for Input, that file must. When. a file is opened for Output, if it does not exist, it will be created if it. When. a file is opened for Append, if it does not exist, it will be created, if it. The. Input and Line Input statements may only be used on files. Input mode the Write and Print may only be. Output or Append modes. Windows system filename with a number this number will be used. VB file processing statements in. Examples Open C Program. FilesEmp. MaintEMPLOYEE. DAT For Input As 1. Open. A EMPLOYEE. DAT For Input As 1. Using App. Path. In order to avoid. VB program, it is. App. Path to reference the path of the file. This way. as long as the file resides in the same directory in which your program is. For example, if both your. C Program FilesEmp. Maint, then that. App. Path would refer to. So if you concatenate App. Path with a. backslash and the name of your data file, then you have a complete reference. Open statement. Examples Open App. Path EMPLOYEE. DAT. For Input As 1. You. Dim str. Emp. File. Name As Stringstr. Emp. File. Name. App. Path EMPLOYEE. DATOpen. Emp. File. Name For Input As 1. A special situation comes up. A. If you concatenate App. Path with a backslash and the. A EMPLOYEE. DATTo cover both situations and. Dim str. Emp. File. Name As String Dim. Back. Slash As String str. Back. Slash. IIf RightApp. Path, 1, str. Emp. File. Name. App. Path str. Back. Slash EMPLOYEE. DATUsing Free. File. In the Open statement and. For example Open str. Emp. File. Name For Input As. Emp. File. Nbr. Thus, a. Emp. File. Name As String Dim str. Back. Slash As String str. Back. Slash IIf RightApp. Path, 1 ., str. Emp. File. Name App. Path str. Back. Slash EMPLOYEE. DATOpen str. Emp. File. Name For Input As. Emp. File. Nbr. The Input. Statement. The Input statement reads. The general format is Input. Opened As. that number for Input in the Open statement. Example BILLY BABCOCK,1. SYSTEMS. ANALYST,21. CHARLIE CHEESEMAN,1. COMPUTER. OPERATOR,311. DARLENE. DUNCAN,2. RECEPTIONIST,1. ERNIE EACHUS,3. MAIL ROOM. CLERK,81. VB knows that. the data is to be read from the EMPLOYEE. DAT file because the Input. Emp. File. Nbr, and file int. Emp. File. Nbr was. EMPLOYEE. DAT in the Open statement. The EOF function. The operating system. VB can sense the presence of this end of file. EOF function. A programming language will. EOF at either one of two times 1 after the last. OR 2 at the same time that the last record. COBOL falls into the first category, VB falls into the second. FYI This discussion applies. VB processes sequential files because when VB processes the rows. EOF the COBOL way. In a language that. EOF after the last record in the file has been read such as COBOL. The pseudocode might be. READ. first RECORD DO. UNTIL EOF. READ next RECORD LOOPIn a language that. EOF when the last record is read such as VB, the input. NO PRIMING READ and. FIRST statement in the body of the processing loop. The. pseudocode might be written as follows DO. UNTIL EOF. READ A RECORD LOOPThe syntax of the EOF. EOFn where n is a number corresponding to. Free. File in the Open statement. The EOF function can be used. UNTIL, WHILE, and IF. The EOF function can also be preceded. NOT for example, Do Until EOF1 is equivalent to Do. While Not EOF1. The main loop to process the. Do Until EOFint. Emp. File. Nbr Processing for the record would go here for. Loop. Building on what has been. Dim str. Emp. File. Name As. String Dim str. Back. Slash As String str. Back. Slash IIf RightApp. Path, 1 ., str. Emp. File. Name App. Path str. Back. Slash amp. EMPLOYEE. DAT Open str. Emp. File. Name For Input As int. Emp. File. Nbr Do Until EOFint. Emp. File. Nbr Print str. Emp. Name Tab2. Formatint.