Uploading a large video from iphone to web server - php

Question

I'm trying to upload a large video from iphone to a web server that has php script.
I'm using NSInputStream to get file video chunks and I'm creating a request(POST) on each traversal of the
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
method, with the read data passed as parameter.
Here is the code I'm using to get chunks of data
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
{
switch(eventCode)
{
case NSStreamEventHasBytesAvailable:
{
NSMutableData *dataSlice;
uint8_t buf[1048576];
unsigned int len = 0;
len = [(NSInputStream *)stream read:buf maxLength:1048576];
if(len)
{
dataSlice = [NSMutableData dataWithBytes:(const void *)buf length:len];
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:folderNameForUpload, kFolderName,
#"abcd.MOV", kFileName,
#"MOV", kFileType,
nil];
MKNetworkOperation *op = [self.networkEngine operationWithPath:#"upload.php" params:params httpMethod:#"POST"];
[op addData:dataSlice forKey: #"file"
mimeType: #"image/mov"
fileName: #"abcd"];
[op onCompletion:^(MKNetworkOperation *completedOperation) {
} onError:^(NSError *error) {
}];
[[WebRequest sharedInstance].networkEngine enqueueOperation: op];
}
else
{
NSLog(#"NO MORE BUFFER!");
}
break;
}
case NSStreamEventEndEncountered:
{
[stream close];
[stream removeFromRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[stream release];
stream = nil;
break;
}
}
}
It is sending the data to the server, and I'm able to write the chunks into a file. But, the problem is that, if there are more than one chunk, the file will become corrupted and I'm not able to open the video file.
I checked the file size on both server and client, and both are exactly same.
Below is the php script, I'm using to merge video file chunks.
$tmp_file = $_FILES['file']['tmp_name'];
$write_handle = fopen($fileURL, "ab+");
$read_handle = fopen($tmp_file, "rb");
$contents = fread($read_handle, filesize($tmp_file));
fwrite($write_handle, $contents);
fclose($write_handle);
fclose($read_handle);
What Am I doing wrong here?, Please help!
I'm stuck over this problem!!
Thanks in Advance,
Suraj

Answer 1

I got the problem myself guys. Actually, I was sending different chunks of video at the same time. And the problem was arising because the later chunks of video reached server before the first chunk of video.
I solved the problem by sending second chunk of video only after the first chunk is reached web server and the response is got at the client side.