iPhone read image from socket - iphone

Question

I am working in a little app for iphone base on ideas used to make an Android app.
To test, obviously i use the simulator, but the simulator don't have support for built-in camera. The Android idea to test this consist in use a WebCamBroadcaster Java app in the desktop to capture frames from built-in webcam and pass it through socket. Then in the app you just read the bytes and convert to image.
Well i was trying to do the same thing with iPhone Simulator. Searching in the web a found a class to work with asynchronous sockets (cocoaasyncsocket). But i can't make it work.
The Java App send the frames like this:
socket = ss.accept();
BufferedImage image = videoCapture.getNextImage();
if (image != null) {
OutputStream out = socket.getOutputStream();
if (RAW) {
image.getWritableTile(0, 0).getDataElements(0, 0, w$
image.releaseWritableTile(0, 0);
DataOutputStream dout = new DataOutputStream(new Bu$
out));
for (int i = 0; i < data.length; i++) {
dout.writeInt(data[i]);
}
dout.close();
} else {
ImageIO.write(image, "JPEG", out);
}
}
The Android version of this use C code to implement de socket reading proccess like this:
long read_count, total_read = 0;
while (total_read < readBufSize)
{
read_count = read(sockd, &readBuf[total_read], readBufSize);
if (read_count <= 0 || errno != 0)
{
char buffer[100];
sprintf(buffer, "socket read errorno = %d", errno);
LOGV(buffer);
break;
}
total_read += read_count;
}
// If we read all of the data we expected, we will load the frame from the p$
if (total_read == readBufSize){
frame = loadPixels(readBuf, width, height);}
Where readBufsize = width*height*sizeof(int);
readBuf = (char*)malloc(readBufSize);
So i try to implement the same for iPhone but i have an error in the connection (errno = 2).. Then i find cocoaasyncsocket and i try to use but i have an unknown error and nothing is read:
#import <Foundation/Foundation.h>
#import "AsyncSocket.h"
#interface Captura : NSObject {
NSString *ipserver;
UInt16 port;
NSError *errPtr;
AsyncSocket *socket;
NSMutableData *socketData;
}
#property (nonatomic,retain) NSString *ipserver;
#property (retain) AsyncSocket *socket;
#property (retain) NSError *errPtr;
//will contain de data read from socket
#property (retain) NSMutableData *socketData;
-(id)initWithIp:(NSString*)ip puerto:(UInt16)p;
-(BOOL)open;
-(void)close;
-(void)beginRead;
- (UIImage*)getImage;
#end
and the implementation
#import "Captura.h"
#implementation Captura
#synthesize ipserver;
#synthesize socket;
#synthesize errPtr;
#synthesize socketData;
-(id)initWithIp:(NSString*)ip puerto:(UInt16)p{
if (self = [super init]) {
ipserver = ip;
port = p;
socket = [[AsyncSocket alloc] initWithDelegate:self];
socketData = [[NSMutableData alloc] init];
}
return self;
}
//Connect
-(BOOL)open{
return [socket connectToHost:ipserver onPort:port error:&errPtr];
}
-(void)beginRead{
NSLog(#"Begin Read");
NSUInteger offset = [socketData length];
[socket readDataWithTimeout:1
tag:0];
}
- (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port{
NSLog(#"Conectado al servidor");
}
- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
NSLog(#"Data leida %u",[data length]);
[socketData appendData:data];
[self beginRead];
}
- (void)onSocketDidDisconnect:(AsyncSocket *)sock{
[socketData release];
[ipserver release];
[socket release];
NSLog(#"MutableData length %u", [socketData length]);
NSLog(#"Socket Desconectado");
}
- (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err{
NSLog(#"Ocurrió un error desconectando.... %#",err);
}
- (UIImage*)getImage{
NSData *data;
[socketData getBytes:data length:320*480*sizeof(int)];
NSLog(#"Data obtenida %#",[data length]);
if ([socketData length]>320*480*sizeof(int)) {
[socketData replaceBytesInRange:NSMakeRange(0,320*480*sizeof(int)) withBytes:NULL length:0];
}
if (data!=nil && [data length]) {
UIImage *img = [[UIImage alloc] initWithData:data];
[data release];
return img;
}
[data release];
return nil;
}
#end
Well this code connect to the server and initialize the reading process and then close up.. socket is disconnect and the app is close.
i can't test de getImage method yet...
Some idea?
Thanks in advance...

Answer 1

I think you need a call to -beginRead in -onSocket:didConnectToHost:port: