CFNetwork进行http网络请求

两种方式：

1. 方式一
2. 方式二(推荐)

方式一:

设置回调:

static void myCFReadStreamClientCallBack0(CFReadStreamRef stream, CFStreamEventType type, void *clientCallBackInfo) {
    ViewController *vc = (ViewController *)clientCallBackInfo;
    if (type == kCFStreamEventEndEncountered) {
        NSLog(@"方式1:\n%@", [[[NSString alloc] initWithData:vc->readData encoding:NSUTF8StringEncoding] autorelease]);
    } else if (type == kCFStreamEventErrorOccurred) {
        CFReadStreamUnscheduleFromRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
        CFReadStreamClose(stream);
        CFRelease(stream);
        stream = NULL;
    } else if (type == kCFStreamEventHasBytesAvailable) {
        UInt8 buffer[2048];
        CFIndex numBytesRead;
        numBytesRead = CFReadStreamRead(stream, buffer, sizeof(buffer));
        // readData为成员变量
        [vc->readData appendBytes:buffer length:numBytesRead];
    }
}

发送请求:

// 创建请求
CFStringRef url = CFSTR("http://www.cnblogs.com/");
CFURLRef myURL = CFURLCreateWithString(kCFAllocatorDefault, url, NULL);// note: release
CFStringRef requestMethod = CFSTR("POST");
CFHTTPMessageRef myRequest = CFHTTPMessageCreateRequest(kCFAllocatorDefault, requestMethod, myURL, kCFHTTPVersion1_1);// note: release
// 设置body
const UInt8 bytes[] = "12345";
CFDataRef bodyData = CFDataCreate(kCFAllocatorDefault, bytes, 5);// note: release
CFHTTPMessageSetBody(myRequest, bodyData);
// 设置header
CFStringRef headerField = CFSTR("name");
CFStringRef value = CFSTR("daniate");
CFHTTPMessageSetHeaderFieldValue(myRequest, headerField, value);
CFReadStreamRef requestReadStream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, myRequest);// note: release
CFStreamClientContext clientContext = {0, self, NULL, NULL, NULL};
CFOptionFlags flags = kCFStreamEventHasBytesAvailable | kCFStreamEventEndEncountered | kCFStreamEventErrorOccurred;
Boolean result = CFReadStreamSetClient(requestReadStream, flags, myCFReadStreamClientCallBack0, &clientContext);
if (result) {
    CFReadStreamScheduleWithRunLoop(requestReadStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
    if (CFReadStreamOpen(requestReadStream)) {
        CFRunLoopRun();
    } else {
        CFReadStreamUnscheduleFromRunLoop(requestReadStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
    }
}
CFRelease(myURL);
CFRelease(myRequest);
CFRelease(bodyData);

方式二(推荐):

设置回调:

static void myCFReadStreamClientCallBack1(CFReadStreamRef stream, CFStreamEventType type, void *clientCallBackInfo) {
    CFHTTPMessageRef response = (CFHTTPMessageRef)clientCallBackInfo;
    if (type == kCFStreamEventEndEncountered) {
        CFIndex statusCode = CFHTTPMessageGetResponseStatusCode(response);
        if (statusCode == 200) {
            CFDataRef responseData = CFHTTPMessageCopyBody(response);
            CFStringRef responseWebPage = CFStringCreateWithBytes(kCFAllocatorDefault, CFDataGetBytePtr(responseData), CFDataGetLength(responseData), kCFStringEncodingUTF8, YES);
            NSLog(@"方式2:\n%@", responseWebPage);
            CFRelease(responseData);
            CFRelease(responseWebPage);
        }
    } else if (type == kCFStreamEventErrorOccurred) {
        CFReadStreamUnscheduleFromRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
        CFReadStreamClose(stream);
        CFRelease(stream);
        stream = NULL;
    } else if (type == kCFStreamEventHasBytesAvailable) {
       

        //获取http response的header，转换成字典

CFTypeRef message =
        CFReadStreamCopyProperty(stream, kCFStreamPropertyHTTPResponseHeader);
        NSDictionary* httpHeaders =
        (__bridge NSDictionary *)CFHTTPMessageCopyAllHeaderFields((CFHTTPMessageRef)message);
        NSLog(@"dic:%@",httpHeaders);
        CFRelease(message);
 UInt8 buffer[ 2048 ];
//回调读取数据时，读取的都是body的内容，response header自动被封装处理好的。
  CFIndex length = CFReadStreamRead(stream, buffer, sizeof (buffer)); CFHTTPMessageAppendBytes(response, buffer, length); }}

发送请求:

// 创建请求
CFStringRef url = CFSTR("http://www.cnblogs.com/");
CFURLRef myURL = CFURLCreateWithString(kCFAllocatorDefault, url, NULL);// note: release
CFStringRef requestMethod = CFSTR("POST");
CFHTTPMessageRef myRequest = CFHTTPMessageCreateRequest(kCFAllocatorDefault, requestMethod, myURL, kCFHTTPVersion1_1);// note: release
// 设置body
const UInt8 bytes[] = "12345";
CFDataRef bodyData = CFDataCreate(kCFAllocatorDefault, bytes, 5);// note: release
CFHTTPMessageSetBody(myRequest, bodyData);
// 设置header
CFStringRef headerField = CFSTR("name");
CFStringRef value = CFSTR("daniate");
CFHTTPMessageSetHeaderFieldValue(myRequest, headerField, value);
CFReadStreamRef requestReadStream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, myRequest);// note: release
CFHTTPMessageRef response = CFHTTPMessageCreateEmpty(kCFAllocatorDefault, false);
CFStreamClientContext clientContext = {0, response, NULL, NULL, NULL};
CFOptionFlags flags = kCFStreamEventHasBytesAvailable | kCFStreamEventEndEncountered | kCFStreamEventErrorOccurred;
Boolean result = CFReadStreamSetClient(requestReadStream, flags, myCFReadStreamClientCallBack1, &clientContext);
if (result) {
    CFReadStreamScheduleWithRunLoop(requestReadStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
    if (CFReadStreamOpen(requestReadStream)) {
        CFRunLoopRun();
    } else {
        CFReadStreamUnscheduleFromRunLoop(requestReadStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
    }
}
CFRelease(myURL);
CFRelease(myRequest);
CFRelease(bodyData);