Question

我尝试在iPhone上创建一个Web服务器，以便在ablum中提供图像的URL。在向客户端发送响应之前，我需要对图像进行一些调整（类似于重新调整大小）。在响应客户端之前，这些操作每个映像最多需要1或1.5秒。（特别是在iPhone 4上）客户端无法接收数据，即使xcode控制台上的消息已经显示某些套接字上已经有多少字节GET。我可以用什么方法来解决这个问题？

另一个问题是如果我将ConnectedStateCoalescingInterval值增加到2.0或3.0秒会发生什么？

感谢。

========= 2015/08/24 13:05更新

这是我的addHandlerForMethod：path：requestClass：asyncProcessBlock：

    [_webServer addHandlerForMethod:@"GET" path:[NSString stringWithFormat:@"/image/%@",assetId] requestClass:[GCDWebServerRequest class] asyncProcessBlock:^(GCDWebServerRequest *request, GCDWebServerCompletionBlock completionBlock)
    {
        __strong typeof(weakself) strongself = weakself;
        [strongself requestImageDataByAssetURL:assetURL completionCb:^(NSData *photoData) {
            GCDWebServerDataResponse* response = [GCDWebServerDataResponse responseWithData:photoData contentType:@"image/png"];
            completionBlock(response);
        }];
    }];

这是requestImageDataByAssetURL：completionCb：

- (void)requestImageDataByAssetURL:(NSURL *)assetURL completionCb:(void(^)(NSData *photoData))cbfunc {
    __block NSData *photoData;
    ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
    [library assetForURL:assetURL resultBlock:^(ALAsset *asset) {
        @autoreleasepool {
            uint64_t begin = mach_absolute_time();
            // <do some image processing here>
            uint64_t end = mach_absolute_time();
            NSLog(@"Time taken to imageResize %g s", MachTimeToSecs(end - begin));
            cbfunc(photoData);
        }
    } failureBlock:^(NSError *error) {
        NSLog(@"[%@] fail. Error=%@", NSStringFromSelector(_cmd), error.localizedDescription);
        cbfunc(nil);
    }];
}

这是日志：

[DEBUG] [2015-08-24 04:48:09 +0000] Did open connection on socket 32
[DEBUG] Connection received 221 bytes on socket 32
[DEBUG] Connection on socket 32 preflighting request "GET /image/9D959040-9FA8-4197-8150-8DC72339955D" with 221 bytes body
[DEBUG] Connection on socket 32 processing request "GET /image/9D959040-9FA8-4197-8150-8DC72339955D" with 221 bytes body
[DEBUG] [2015-08-24 04:48:10 +0000] Did open connection on socket 34
2015-08-24 12:48:10.799 xBoard[2981:3707] Time taken to imageResize 1.52039 s
[DEBUG] Connection received 221 bytes on socket 34
[DEBUG] Connection on socket 34 preflighting request "GET /image/9D959040-9FA8-4197-8150-8DC72339955D" with 221 bytes body
[DEBUG] Connection on socket 34 processing request "GET /image/9D959040-9FA8-4197-8150-8DC72339955D" with 221 bytes body
[DEBUG] Connection sent 171 bytes on socket 32
[DEBUG] Connection sent 123575 bytes on socket 32
[DEBUG] Did close connection on socket 32
[VERBOSE] [172.16.20.174:8080] 172.16.21.97:34450 200 "GET /image/9D959040-9FA8-4197-8150-8DC72339955D" (221 | 123746)
2015-08-24 12:48:12.028 xBoard[2981:4f0b] Time taken to imageResize 1.06382 s
[DEBUG] Connection sent 171 bytes on socket 34
[DEBUG] Connection sent 123575 bytes on socket 34
[DEBUG] Did close connection on socket 34
[VERBOSE] [172.16.20.174:8080] 172.16.21.97:50852 200 "GET /image/9D959040-9FA8-4197-8150-8DC72339955D" (221 | 123746)

我们可以看到它创建了第一个套接字（32）然后立即为同一图像请求创建第二个套接字（34）看来GCDWebServer立即关闭了第一个套接字。但为什么呢？

P.S。顺便说一下，客户端使用Android Volley库来下载图像而不是使用Web浏览器。

Answer 1

根据日志似乎没有任何错误：路径GET的2 /image/9D959040-9FA8-4197-8150-8DC72339955D个请求在套接字32和34上处理，每个返回123,575个字节。

尝试使用Chrome及其网络检查器等桌面网络浏览器。如果一切正常，那么问题在于您的Android应用。

客户端无法从gcdwebserver接收图像数据

1 个答案: