CSV文件简单操作
github第三方解析代码地址：https://github.com/davedelong/CHCSVParser
以下非CHCSVParser用法，仅是我自己copy改的demo代码：
- (void) exportImpl
{
// NSArray* documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
// NSString* documentsDir = [documentPaths objectAtIndex:0];
NSString* csvPath = [NSTemporaryDirectory() stringByAppendingPathComponent: @"export.csv"];
NSLog(@"%@" , NSTemporaryDirectory());
// TODO: mutex lock?
[self exportCsv: csvPath];
// mail is graphical and must be run on UI thread
[self performSelectorOnMainThread: @selector(mail:) withObject: csvPath waitUntilDone: NO];
}
- (void) mail: (NSString*) filePath
{
if ([MFMailComposeViewControllercanSendMail]) {
// TODO: autorelease pool needed ?
NSData* database = [NSData dataWithContentsOfFile: filePath];
if (database != nil) {
MFMailComposeViewController* picker = [[MFMailComposeViewControlleralloc] init];
picker.mailComposeDelegate = self;
[picker setSubject:[NSStringstringWithFormat: @"%@ %@", [[UIDevicecurrentDevice] model], [filePath lastPathComponent]]];
[picker setToRecipients:@[@"xx@xx.com"]];
NSString* filename = [filePath lastPathComponent];
[picker addAttachmentData: database mimeType:@"application/octet-stream" fileName: filename];
NSString* emailBody = @"Attached is the SQLite data from my iOS device.";
[picker setMessageBody:emailBody isHTML:YES];
[self presentViewController:picker animated:YEScompletion:^{
}];
}
}
}
-(void) exportCsv: (NSString*) filename
{
[self createTempFile: filename];
NSOutputStream* output = [[NSOutputStream alloc] initToFileAtPath: filename append: YES];
[output open];
if (![output hasSpaceAvailable]) {
NSLog(@"No space available in %@", filename);
// TODO: UIAlertView?
} else {
NSString* headerStr = @"Source,Time,Latitude,Longitude,Accuracy\n";
NSData *headerData = [headerStr dataUsingEncoding:NSUTF8StringEncoding];
const void *headerBytes = [headerData bytes];
int headerLength = [headerData length];
uint8_t *headerBuf = (uint8_t*)headerBytes;
NSInteger result = [output write: headerBuf maxLength: headerLength];
if (result <= 0) {
NSLog(@"1,exportCsv encountered error=%d from header write", result);
}
NSString* line1 = [[NSString alloc] initWithFormat: @"%@,%@,%f,%f,%d\n", @"大啊" , @"ab" , 1.1 , 1.2 , 1];
result = [output write:(uint8_t *)[[line1 dataUsingEncoding:NSUTF8StringEncoding] bytes] maxLength: [line1 lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
if ((result <= 0)) {
NSLog(@"2,exportCsv write returned %d", result);
}
NSString *line2 = @"小啊,bb,2.1,2.2,2\n";
result = [output write:(uint8_t *)[line2 UTF8String] maxLength:[line2 length]];
if ((result <= 0)) {
NSLog(@"2,exportCsv write returned %d", result);
}
[output close];
}
}
-(void)createTempFile:(NSString*)filename {
NSFileManager* fileSystem = [NSFileManagerdefaultManager];
[fileSystem removeItemAtPath: filename error: nil];
NSMutableDictionary* attributes = [NSMutableDictionarydictionary];
NSNumber* permission = [NSNumber numberWithLong: 0640];
[attributes setObject: permission forKey: NSFilePosixPermissions];
if (![fileSystem createFileAtPath:filename contents: nil attributes: attributes]) {
NSLog(@"Unable to create temp file for exporting CSV.");
// TODO: UIAlertView?
}
}
-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
NSString *msg;
switch (result)
{
case MFMailComposeResultCancelled:
msg = @"邮件发送取消";
break;
case MFMailComposeResultSaved:
msg = @"邮件保存成功";
// [self alertWithTitle:nil msg:msg];
break;
case MFMailComposeResultSent:
msg = @"邮件发送成功";
// [self alertWithTitle:nil msg:msg];
break;
case MFMailComposeResultFailed:
msg = @"邮件发送失败";
// [self alertWithTitle:nil msg:msg];
break;
default:
break;
}
[self dismissViewControllerAnimated:YEScompletion:^{
NSLog(@" --> %@" , msg);
}];
}
