closeFile
Disallows further access to the represented file or communications channel and signals end of file on communications channels that permit writing.
- (void)closeFile
Discussion of [NSFileHandle closeFile]
If the file handle object owns its file descriptor, it automatically closes that descriptor when it is deallocated. If you initialized the file handle object using the
initWithFileDescriptor: method, or you initialized it using theinitWithFileDescriptor:closeOnDealloc: and passed NO for the flag parameter, you can use this method to close the file descriptor; otherwise, you must close the file descriptor yourself.[NSFileHandle closeFile]
After calling this method, you may still use the file handle object but must not attempt to read or write data or use the object to operate on the file descriptor. Attempts to read or write a closed file descriptor raise an exception.
Example of [NSFileHandle closeFile]
- (NSString *)outputFromExporter:(COExporter *)exporter input:(NSString *)input {
NSString *exportedString = nil;
NSString *path = [exporter path];
NSTask *task = [[NSTask alloc] init];
NSPipe *writePipe = [NSPipe pipe];
NSFileHandle *writeHandle = [writePipe fileHandleForWriting];
NSPipe *readPipe = [NSPipe pipe];
NSFileHandle *readHandle = [readPipe fileHandleForReading];
NSMutableData *outputData = [[NSMutableData alloc] init];
NSData *readData = nil;
// Set the launch path and I/O for the task
[task setLaunchPath:path];
[task setStandardInput:writePipe];
[task setStandardOutput:readPipe];
// Launch the exporter, it will convert the raw OPML into HTML, Plaintext, etc
[task launch];
// Write the raw OPML representation to the exporter's input stream
[writeHandle writeData:[input dataUsingEncoding:NSUTF8StringEncoding]];
[writeHandle closeFile];
while ((readData = [readHandle availableData]) && [readData length]) {
[outputData appendData:readData];
}
exportedString = [[NSString alloc] initWithData:outputData encoding:NSUTF8StringEncoding];
return exportedString;
}
