Try to open the Test.txt file for writing to Here is a simple example of access to a text file: They do support number to string and string to number formatting, but you are often better off defining your own record structure and using a typed binary file instead. Text files fall short when reading and writing structured data. Text files are great for simple uses, such as where we record a processing log. Meanwhile, when we have finished, we must close the file: We'll cover the access mechanisms for text and binary files separately. Reset Opens a file for read and write accessĪppend Opens a file for appending to the end (such as a log file) ReWrite Opens a file as new - discards existing contents if file exists This operation tells Delphi how we want to treat the file.

Next, we must open the file using this handle. We ask Delphi to assign a file handle for a file called 'Test.txt' which will be assumed to be in the current directory (as given by the GetCurrentDir routine). Here we are getting a handle to a text file, designated by the TextFile type (binary files are of type File). First, we must get a handle for a named file: (The latter can hold non character data values). There are a number of basic operations for handling both text and binary files. The TStringList class has methods for loading the list of strings from a text file. They are not covered here.Īdditionally, hidden away, Delphi provides a very elegant way of reading and writing complete text files. They also support text files less intuitively. The other type are thin wrappers around Windows APIs - and as such are platform specific. The most Delphi like are covered by this article and this web site. Disks such as hard disks, floppy disks, CDs and DVDs (the latter are treated as read only).ĭelphi confusingly provides two basic sets of routines for file handling. Of greater importance to modern applications, are disk file operations. The following information can be useful for your online university degree or for a better understanding of Delphi. With no file name, IO (Input and Output) is routed to the console. The oldest is in support of consoles, where the Read, ReadLn, Write and WriteLn routines have a syntax that omits the file name. Learn to program in Pascal - online education courseĭelphi provides a number of different file access mechanisms.

Delphi read csv file