Visual basic file input

Then we read those numbers and print them to the console. The line creates and initializes a MemoryStream object with a capacity of six bytes. We set the position of the cursor in the stream to the beginning using the Position property. StreamReader reads characters from a byte stream. It defaults to UTF-8 encoding. StreamWriter writes characters to a stream in a particular encoding. We have a file called languages. We read characters from that file and print them to the console.

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. The file contains records of the structure Person.

This code example opens the file in Output mode; any process can read or write to file. This code example opens the file in Binary mode for reading; other processes cannot read file. The FileOpen function is provided for backward compatibility and may affect performance. For non-legacy applications, the My. Data items in a file must appear in the same order as the variables in varlist and match variables of the same data type.

If a variable is numeric and the data is not numeric, a value of zero is assigned to the variable. If you reach the end of the file while you are inputting a data item, the input is terminated and an error occurs. To be able to correctly read data from a file into variables by using Input , use the Write statement instead of the Print statement to write the data to the files.

Using Write ensures that each separate data field is properly delimited. This example uses the Input statement to read data from a file into two variables. This example assumes that TESTFILE is a file with a few lines of data written to it by using the Write statement; that is, each line contains a string in quotations and a number separated by a comma, for example, "Hello", Input 1, numstates.

Input 1, cellval, cellnum. A comma must follow the file number. Items printed may be separated by commas or semicolons. If separated by commas, they are printed in separate print fields. Items to be printed can be string constants, numeric constants, variables, or expressions.

One way to force a line feed is to issue a print without any items to print. To read from a file, use Input followed by a list of variables into which the values from the file are to be placed. Some of these are hard to find in the Index.

One way to get to their descriptions is to highlight the word in the code window, then press F1 for context sensitive help.