Apple

Hi, EveryBody,

I write a demo using CFHTTP functions, but seems that the CallBack function is never called (sigh...). AnyBody can help me? thanks a lot.

The followings are the code snippet:

#include <Carbon/Carbon.h>

static const CFOptionFlags kNetworkEvents = kCFStreamEventOpenCompleted     |
                                            kCFStreamEventHasBytesAvailable |
                                            kCFStreamEventEndEncountered    |
                                            kCFStreamEventErrorOccurred;

void handleNetworkEvent(CFStreamEventType);

static void
readStreamClientCallBack(CFReadStreamRef stream, CFStreamEventType type, void *clientCallBackInfo) {
// hanle network events
printf("call back function is called\n");
handleNetworkEvent(type);
}

CFReadStreamRef _stream;

CFHTTPMessageRef _request;

CFHTTPMessageRef _response;

int main(int argc, char* argv[])
{
printf("hello, xcode\n");

CFURLRef url = "" CFSTR("http://192.168.0.58"), NULL);
if(url == NULL) {
printf("error: create url\n");
return -1;
}

_request = CFHTTPMessageCreateRequest(kCFAllocatorDefault, CFSTR("GET"), url, kCFHTTPVersion1_1);
CFRelease(url);
if(_request == NULL) {
  printf("error: create request\n");
  return -1;
}

_stream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, _request);
CFRelease(_request);
if(_stream == NULL) {
  printf("error: create stream for request\n");
  return -1;
}

// CFStreamClientContext is used for callback function to receive user-defined data.
// CFStreamClientContext ctxt = {0, NULL, NULL, NULL, NULL};

// Set client: call back function
// if(! CFReadStreamSetClient(_stream, kNetworkEvents, readStreamClientCallBack, &ctxt)) {
if(! CFReadStreamSetClient(_stream, kNetworkEvents, readStreamClientCallBack, NULL)) {
  CFRelease(_stream);
  printf("error: set client to read stream\n");
  return -1;
    }

// Schedule the stream
CFReadStreamScheduleWithRunLoop(_stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);

// Start the HTTP connection
if(! CFReadStreamOpen(_stream)) {
  CFReadStreamSetClient(_stream, 0, NULL, NULL);
  CFReadStreamUnscheduleFromRunLoop(_stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
  CFRelease(_stream);
  printf("error: open stream to send http request");
  return -1;
}

printf("exit main entry...");
return 0;
}

Thanks,

Alex Guo