[英]NSOutputStream, how to output data properly after the NSStreamEventHasSpaceAvailable event has passed?
我將要發送到服務器的消息添加到隊列中:
typedef struct StreamOutputQueue{
char message[513];
struct StreamOutputQueue * next;
} StreamOutputQueue;
當我收到事件NSStreamEventHasSpaceAvailable時,我發送隊列中的第一條消息,然后將其刪除,以便准備好下一條消息。 如果隊列為空,則設置一個標志,這樣我就可以立即發送下一條消息而無需將其添加到隊列中,因為該流應該已經准備好並且隊列為空。
這是獲取事件后的代碼:
case NSStreamEventHasSpaceAvailable:
NSLog(@"Space Available!");
if (login_start) { //Login
range = [nick_field.text rangeOfString: @" "]; //Find space in nickname text
if (range.location != NSNotFound) { //Found so include only the text up to the space.
used_nick = [nick_field.text substringToIndex: range.location];
}else{ //Else include it all
used_nick = nick_field.text;
}
[irc_output_stream write:(const uint8_t *)[[NSString stringWithFormat:@"USER %@ * * :%@ \r\nNICK %@\r\n", used_nick, nick_field.text,used_nick,nil] UTF8String] maxLength:1024]; //Send USER and NICK IRC commands
login_start = NO; //Login done.
}else if (output_queue){ //Queue exists
printf("OUTPUT QUEUE HAS DATA - %s\n",output_queue->message);
[irc_output_stream write: (const uint8_t *)output_queue->message maxLength:512]; //Send message to server.
StreamOutputQueue * next = output_queue->next;
free(output_queue);
output_queue = next; //Queue pointer points to next node.
space_available = NO;
}else{
space_available = YES; //Nothing sent, space available for immediate data delivery to server.
}
break;
登錄正常。 登錄完成后,程序將在需要時開始使用隊列發送消息。
這是將數據添加到隊列末尾的代碼:
- (void) appendToOutputQueue: (char *) message{
if (space_available) { //Space available with no queue so send the next one now.
printf("SPACE AVAILABLE NO QUEUE - %s",message);
[irc_output_stream write: (const uint8_t *)message maxLength:512];
space_available = NO; //Wait until space is available again
return; //Do not continue to add to queue
}
//Add to queue
StreamOutputQueue * new;
new = malloc(sizeof(*new)); //Allocate new node
new->next = NULL; //Next must be null to signify end
strcpy(new->message,message); //Copy message data
if (output_queue) { //If the queue exists add the node to the end
output_queue_end->next = new;
}else{ //Else make the queue start at this node
output_queue = new;
}
output_queue_end = new; //The end node is now this one
}
問題是服務器無法識別通過隊列發送的數據。 數據在printf調用中正確打印。 登錄工作正常。 如果數據是從事件方法外部發送的,則每次都會失敗,而在事件方法中的某些時間,服務器將好像已損壞的數據一樣,將失敗。
應該怎么做?
謝謝。
需要刪除const,我將strlen添加到maxLength。
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