Comment puis-je télécharger une photo sur un serveur avec l'iPhone?

En-tête:

@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

Principal:

#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

Utilisation:

        [[EPUploader alloc] initWithURL:[NSURL URLWithString:@"http://yourserver.com/uploadDB.php"]
filePath:@"path/to/some/file"
delegate:self
doneSelector:@selector(onUploadDone:)
errorSelector:@selector(onUploadError:)];       

Créer un NSURLRequest et ensuite utiliser NSURLConnection à l'envoyer sur votre serveur.

- (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");    
}
}