Ich schreibe eine iPhone-App, die ein Foto aufnimmt und es dann auf einen Server hochlädt. Wie lade ich ein Foto mit Cocoa auf einen Server hoch? Ich nehme an, ich benutze NSUrl irgendwo.
Vielen Dank!
Antworten:
Header:
@interface EPUploader : NSObject {
NSURL *serverURL;
NSString *filePath;
id delegate;
SEL doneSelector;
SEL errorSelector;
BOOL uploadDidSucceed;
}
- (id)initWithURL: (NSURL *)serverURL
filePath: (NSString *)filePath
delegate: (id)delegate
doneSelector: (SEL)doneSelector
errorSelector: (SEL)errorSelector;
- (NSString *)filePath;
@end
Main:
#import "EPUploader.h"
#import <zlib.h>
static NSString * const BOUNDRY = @"0xKhTmLbOuNdArY";
static NSString * const FORM_FLE_INPUT = @"uploaded";
#define ASSERT(x) NSAssert(x, @"")
@interface EPUploader (Private)
- (void)upload;
- (NSURLRequest *)postRequestWithURL: (NSURL *)url
boundry: (NSString *)boundry
data: (NSData *)data;
- (NSData *)compress: (NSData *)data;
- (void)uploadSucceeded: (BOOL)success;
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;
@end
@implementation EPUploader
/*
*-----------------------------------------------------------------------------
*
* -[Uploader initWithURL:filePath:delegate:doneSelector:errorSelector:] --
*
* Initializer. Kicks off the upload. Note that upload will happen on a
* separate thread.
*
* Results:
* An instance of Uploader.
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (id)initWithURL: (NSURL *)aServerURL // IN
filePath: (NSString *)aFilePath // IN
delegate: (id)aDelegate // IN
doneSelector: (SEL)aDoneSelector // IN
errorSelector: (SEL)anErrorSelector // IN
{
if ((self = [super init])) {
ASSERT(aServerURL);
ASSERT(aFilePath);
ASSERT(aDelegate);
ASSERT(aDoneSelector);
ASSERT(anErrorSelector);
serverURL = [aServerURL retain];
filePath = [aFilePath retain];
delegate = [aDelegate retain];
doneSelector = aDoneSelector;
errorSelector = anErrorSelector;
[self upload];
}
return self;
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader dealloc] --
*
* Destructor.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (void)dealloc
{
[serverURL release];
serverURL = nil;
[filePath release];
filePath = nil;
[delegate release];
delegate = nil;
doneSelector = NULL;
errorSelector = NULL;
[super dealloc];
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader filePath] --
*
* Gets the path of the file this object is uploading.
*
* Results:
* Path to the upload file.
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (NSString *)filePath
{
return filePath;
}
@end // Uploader
@implementation EPUploader (Private)
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) upload] --
*
* Uploads the given file. The file is compressed before beign uploaded.
* The data is uploaded using an HTTP POST command.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (void)upload
{
NSData *data = [NSData dataWithContentsOfFile:filePath];
ASSERT(data);
if (!data) {
[self uploadSucceeded:NO];
return;
}
if ([data length] == 0) {
// There's no data, treat this the same as no file.
[self uploadSucceeded:YES];
return;
}
// NSData *compressedData = [self compress:data];
// ASSERT(compressedData && [compressedData length] != 0);
// if (!compressedData || [compressedData length] == 0) {
// [self uploadSucceeded:NO];
// return;
// }
NSURLRequest *urlRequest = [self postRequestWithURL:serverURL
boundry:BOUNDRY
data:data];
if (!urlRequest) {
[self uploadSucceeded:NO];
return;
}
NSURLConnection * connection =
[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
if (!connection) {
[self uploadSucceeded:NO];
}
// Now wait for the URL connection to call us back.
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) postRequestWithURL:boundry:data:] --
*
* Creates a HTML POST request.
*
* Results:
* The HTML POST request.
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (NSURLRequest *)postRequestWithURL: (NSURL *)url // IN
boundry: (NSString *)boundry // IN
data: (NSData *)data // IN
{
// from http://www.cocoadev.com/index.pl?HTTPFileUpload
NSMutableURLRequest *urlRequest =
[NSMutableURLRequest requestWithURL:url];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setValue:
[NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundry]
forHTTPHeaderField:@"Content-Type"];
NSMutableData *postData =
[NSMutableData dataWithCapacity:[data length] + 512];
[postData appendData:
[[NSString stringWithFormat:@"--%@\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:
[[NSString stringWithFormat:
@"Content-Disposition: form-data; name=\"%@\"; filename=\"file.bin\"\r\n\r\n", FORM_FLE_INPUT]
dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:data];
[postData appendData:
[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]];
[urlRequest setHTTPBody:postData];
return urlRequest;
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) compress:] --
*
* Uses zlib to compress the given data.
*
* Results:
* The compressed data as a NSData object.
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (NSData *)compress: (NSData *)data // IN
{
if (!data || [data length] == 0)
return nil;
// zlib compress doc says destSize must be 1% + 12 bytes greater than source.
uLong destSize = [data length] * 1.001 + 12;
NSMutableData *destData = [NSMutableData dataWithLength:destSize];
int error = compress([destData mutableBytes],
&destSize,
[data bytes],
[data length]);
if (error != Z_OK) {
NSLog(@"%s: self:0x%p, zlib error on compress:%d\n",__func__, self, error);
return nil;
}
[destData setLength:destSize];
return destData;
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) uploadSucceeded:] --
*
* Used to notify the delegate that the upload did or did not succeed.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (void)uploadSucceeded: (BOOL)success // IN
{
[delegate performSelector:success ? doneSelector : errorSelector
withObject:self];
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) connectionDidFinishLoading:] --
*
* Called when the upload is complete. We judge the success of the upload
* based on the reply we get from the server.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (void)connectionDidFinishLoading:(NSURLConnection *)connection // IN
{
NSLog(@"%s: self:0x%p\n", __func__, self);
[connection release];
[self uploadSucceeded:uploadDidSucceed];
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) connection:didFailWithError:] --
*
* Called when the upload failed (probably due to a lack of network
* connection).
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (void)connection:(NSURLConnection *)connection // IN
didFailWithError:(NSError *)error // IN
{
NSLog(@"%s: self:0x%p, connection error:%s\n",
__func__, self, [[error description] UTF8String]);
[connection release];
[self uploadSucceeded:NO];
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) connection:didReceiveResponse:] --
*
* Called as we get responses from the server.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
-(void) connection:(NSURLConnection *)connection // IN
didReceiveResponse:(NSURLResponse *)response // IN
{
NSLog(@"%s: self:0x%p\n", __func__, self);
}
/*
*-----------------------------------------------------------------------------
*
* -[Uploader(Private) connection:didReceiveData:] --
*
* Called when we have data from the server. We expect the server to reply
* with a "YES" if the upload succeeded or "NO" if it did not.
*
* Results:
* None
*
* Side effects:
* None
*
*-----------------------------------------------------------------------------
*/
- (void)connection:(NSURLConnection *)connection // IN
didReceiveData:(NSData *)data // IN
{
NSLog(@"%s: self:0x%p\n", __func__, self);
NSString *reply = [[[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding]
autorelease];
NSLog(@"%s: data: %s\n", __func__, [reply UTF8String]);
if ([reply hasPrefix:@"YES"]) {
uploadDidSucceed = YES;
}
}
@end
Verwendung:
[[EPUploader alloc] initWithURL:[NSURL URLWithString:@"http://yourserver.com/uploadDB.php"]
filePath:@"path/to/some/file"
delegate:self
doneSelector:@selector(onUploadDone:)
errorSelector:@selector(onUploadError:)];
Hoffe, dass das folgende Code-Snippet für Sie funktioniert. Ich habe NSDateFormatter und NSDate verwendet, um jedes Mal einen eindeutigen Namen für das Bild zu erhalten.
Hinweis: 'ImageUploadURL'Ist die Zeichenfolge #define mit der Basis-URL, müssen Sie sie durch Ihre Server-URL ersetzen.
// Datumsformat für Bildname ...
NSDateFormatter *format = [[NSDateFormatter alloc] init];
[format setDateFormat:@"yyyyMMddHHmmss"];
NSDate *now = [[NSDate alloc] init];
NSString *imageName = [NSString stringWithFormat:@"Image_%@", [format stringFromDate:now]];
[now release];
[format release];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:ImageUploadURL]];
[request setHTTPMethod:@"POST"];
/*
Set Header and content type of your request.
*/
NSString *boundary = [NSString stringWithString:@"---------------------------Boundary Line---------------------------"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
/*
now lets create the body of the request.
*/
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@.jpg\"\r\n", imageName] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:UIImageJPEGRepresentation(image, 90)]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"geotag=%@&", [self _currentLocationMetadata]] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// set body with request.
[request setHTTPBody:body];
[request addValue:[NSString stringWithFormat:@"%d", [body length]] forHTTPHeaderField:@"Content-Length"];
// now lets make the connection to the web
[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
Erstellen Sie eine NSURLRequest und senden Sie sie mit NSURLConnection an Ihren Server.
Die Three20- Bibliothek unterstützt anscheinend das POSTEN von Bildern auf dem HTTP-Server.
Siehe TTURLRequest.m
Und es wird unter der Apache 2.0-Lizenz veröffentlicht.
- (void) uploadImage :(NSString *) strRequest
{
if([appdel checkNetwork]==TRUE)
{
NSString *urlString =[NSString stringWithFormat:@"Enter Url........."];
NSLog(@"Upload %@",urlString);
// setting up the request object now
isUploadImage=TRUE;
totalsize=[[strRequest dataUsingEncoding:NSUTF8StringEncoding]length];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
NSString *boundary = [NSString stringWithString:@"_1_19330907_1317415362628"];
NSString *contentType = [NSString stringWithFormat:@"multipart/mixed; boundary=%@",boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
[request setValue:@"text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2" forHTTPHeaderField:@"Accept"];
[request setValue:@"2667" forHTTPHeaderField:@"Content-Length"];
/*
now lets create the body of the post
*/
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/json\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
//[body appendData:[NSData dataWithData:imageData]];
[body appendData:[strRequest dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];
theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
if (theConnection)
webData = [[NSMutableData data] retain];
else
NSLog(@"No Connection");
}
}
Wenn Sie mehrere Bilder hochladen möchten, ist diese Demo eine gute Option.