Renaming files in objective c

I've seen this question asked a few times but I have been unable thus far to achieve success using any of the post solutions. What I am trying to do is rename a file in the local storage of an app also kind of new to Obj-c. I am able to retrieve the old path and create the new path, but what would I have to write in order to actually change the files name?

Better still, put the renameFileFrom:to: method into a utility class and make it a class method so it can be called from anywhere in your project. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Renaming an existing file with Obj-C Ask Question.

Asked 9 years ago. Active 9 years ago. Viewed 9k times. Daij-Djan 48k 17 17 gold badges silver badges bronze badges. Charles Lillo Charles Lillo 3 3 silver badges 16 16 bronze badges. So you want to rename newPDF. If an attempt to open a file fails, for example because an attempt is made to open a non-existent file for reading, these methods return nil. For example, the following code excerpt opens a file for reading and writing and then closes it without actually doing anything to the file:.

NSFileHandle objects maintain a pointer to the current position in a file. This is referred to as the offset. When a file is first opened the offset is set to 0 the beginning of the file. This means that any read or write operations we perform using the NSFileHandle methods will take place at offset 0 in the file. To perform operations at different locations in a file for example to append data to the end of the file it is first necessary to seek to the required offset. For example to move the current offset to the end of the file, use the seekToEndOfFile method.

Alternatively, seekToFileOffset allows you to specify the precise location in the file to which the offset is to be positioned. Finally, the current offset may be identified using the offsetInFile method. In order to accommodate large files, the offset is stored in the form of an unsigned long long. The following example opens a file for reading and then performs a number of method calls to move the offset to different positions, outputting the current offset after each move:.

File offsets are a key aspect of working with files using the NSFileHandle class so it is worth taking extra time to make sure you understand the concept. Without knowing where the current offset is in a file it is impossible to know where in the file data will be read or written.

Once a file has been opened and assigned a file handle, the contents of that file may be read from the current offset position. The readDataOfLength method reads a specified number of bytes of data from the file starting at the current offset. For example, the following code reads 5 bytes of data from offset 10 in a file. The data read is returned encapsulated in an NSData object:.

Alternatively, the readDataToEndOfFile method will read all the data in the file starting at the current offset and ending at the end of the file. The writeData method writes the data contained in an NSData object to the file starting at the location of the offset. Note that this does not insert data but rather overwrites any existing data in the file at the corresponding location.

To see this in action we need to begin with a file. Using a text editor, create a file named quickfox. Rename Rename refactoring allows you to rename symbols, files, and directories globally with all the references to them in the code corrected automatically. Rename a symbol Select an item to be renamed. Rename a file or directory Select a desired file in the Project tool window. Change the refactoring scope in the corresponding field if needed.

CLion finds all the occurrences of the filename and changes them respectively. Example This example represents CMakelists. Refactoring Change signature.