Vb6 file open syntax

Opens a file for input or output. For more information, see FileSystem. Any valid file number. Use the FreeFile function to obtain the next available file number. A string expression that specifies a file name - may include directory or folder, and drive. For more information, see OpenMode. Enumeration specifying the operations permitted on the open file: Read , Write , or ReadWrite.

Defaults to ReadWrite. For more information, see OpenAccess. Defaults to Lock Read Write. For more information, see OpenShare. Number less than or equal to 32, bytes. For files opened for random access, this value is the record length. For sequential files, this value is the number of characters buffered. FileName is already open, or FileName is invalid. This example illustrates various uses of the FileOpen function to enable input and output to a file.

The following example opens the file in Random mode. Once the Get statement is executed, the data from the file record can be referenced using the following syntax: recordname. For example, a reference the EmpName field would be coded as:. The Put Statement. The Put statement is used write data to a file opened in random mode.

The syntax, as it applies to binary files is:. Put [ ] filenumber , [ recnumber ], varname. Recnumber is the record position within the file which is written. You can omit this entry, in which case the next record following the last Get or Put statement is written. If you omit the record number entry, you must still include the delimiting commas in the Put statement, for example:.

Varname is the record variable from which the data will be written. The "Try It" sample program performs three main functions that demonstrate the features of random files: 1 creates a random file based on input from a sequential file; 2 reads back the random file just created and displays its contents; and 3 retrieves a record from the random file given the record number, and updates a field in the retrieved record based on user input.

The code listed below is heavily commented to aid in the understanding of how the program works. The Type declaration for EmployeeRecord must be defined in the General Declarations section of the from the portion of the code prior to where any Subs or Functions are defined.

Dim strBackSlash As String. Dim strPrompt As String. Dim strNewJob As String. Dim intRecordCount As Integer. Dim strRecordNumber As String. Dim intRecordNumber As Integer. Dim intX As Integer. Dim strEmpName As String. Dim intDeptNbr As Integer. Dim strJobTitle As String. Dim dtmHireDate As Date. Dim sngHrlyRate As Single. Kill strRndEmpFileName. With mudtEmpRecord. End With.

Close intSeqEmpFileNbr. Close intRndEmpFileNbr. But first what happens when you double click the file in Windows Explorer? If the file opens up then we know there's a program that your system associated with files having the. If the file does not open you need to associate a program with the. Check Windows help for more. Once we're set, in your test program change the code in your smb3 Click Event to:. Run this and click the program.

The file should open. If not, tell me what error you get and where, and tell me what if anything is in the Immediate Window. If the program does open then you have in the button's click event and your declaration of ShellExecute the code you need to open files programmatically.

But there's still a change you must make and changes you should make. The change you must make is in the button's click event. We'll remove the debugging code so you end up with this:. The changes you should make involve some basic error handling around the call to ShellExecute. ShellExecute returns a code when it runs.

This code could indicate an error. Study the sample program you can download on the page I linked above. In it, the programmer writes the result of his call to a variable called result. If result is equal to or less than 32 this indicates an error. In the sample program the error is displayed in an error message but think about what you might want to do.

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