我花了两天谷歌搜索和阅读蓝牙编程指南,同时尝试拼凑一个小型Mac应用程序,它将从一个drop文件夹中检索图像,并通过蓝牙将任何新文件发送到预定的设备.似乎没有很多好的例子可供使用.
我正处于能够产生蓝牙服务浏览器并选择设备及其OBEX服务,建立服务和创建连接的地步,但之后不再发生任何事情.谁能指点我/向我展示一个可行的简单例子？
附带AppDelegate源代码.谢谢阅读！
#import "AppDelegate.h"
@implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
IOBluetoothServiceBrowserController *browser = [IOBluetoothServiceBrowserController serviceBrowserController:0];
[browser runModal];
//IOBluetoothSDPServiceRecord
IOBluetoothSDPServiceRecord *result = [[browser getResults] objectAtIndex:0];
[self describe:result];
if ([[result.device.name substringToIndex:8] isEqualToString:@"Polaroid"]) {
printer = result.device;
serviceRecord = result;
[self testPrint];
}
else {
NSLog(@"%@ is not a valid device", result.device.name);
}
}
- (void) testPrint {
currentFilePath = @"/Users/oyvind/Desktop/_DSC8797.jpg";
[self sendFile:currentFilePath];
}
- (void) sendFile:(NSString *)filePath {
IOBluetoothOBEXSession *obexSession = [[IOBluetoothOBEXSession alloc] initWithSDPServiceRecord:serviceRecord];
if( obexSession != nil )
{
NSLog(@"OBEX Session Established");
OBEXFileTransferServices *fst = [OBEXFileTransferServices withOBEXSession:obexSession];
OBEXDelegate *obxd = [[OBEXDelegate alloc] init];
[obxd setFile:filePath];
[fst setDelegate:obxd];
OBEXError cnctResult = [fst connectToObjectPushService];
if( cnctResult != kIOReturnSuccess ) {
NSLog(@"Error creating connection");
return;
}
else {
NSLog(@"OBEX Session Created. Sending file: %@", filePath);
[fst sendFile:filePath];
[printer openConnection];
}
}
else {
NSLog(@"Error creating OBEX session");
NSLog(@"Error sending file");
}
}
@end
最佳答案 好;这里最终成为功能的核心部分.我制作的应用程序是Polaroid即时打印机的一种打印服务器,它只接受Object Push上的图像.
首先,确保监视文件夹存在.
/*
Looks for a directory named PolaroidWatchFolder in the user's desktop directory
and creates it if it does not exist.
*/
- (void) ensureWatchedFolderExists {
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *url = [NSURL URLWithString:@"PolaroidWatchFolder" relativeToURL:[[fileManager URLsForDirectory:NSDesktopDirectory inDomains:NSUserDomainMask] objectAtIndex:0]];
BOOL isDir;
if ([fileManager fileExistsAtPath:[url path] isDirectory:&isDir] && isDir) {
[self log:[NSString stringWithFormat:@"Watched folder exists at %@", [url absoluteURL]]];
watchFolderPath = url;
}
else {
NSError *theError = nil;
if (![fileManager createDirectoryAtURL:url withIntermediateDirectories:NO attributes:nil error:&theError]) {
[self log:[NSString stringWithFormat:@"Watched folder could not be created at %@", [url absoluteURL]]];
}
else {
watchFolderPath = url;
[self log:[NSString stringWithFormat:@"Watched folder created at %@", [url absoluteURL]]];
}
}
}
然后扫描可用的打印机：
/*
Loops through all paired Bluetooth devices and retrieves OBEX Object Push service records
for each device who's name starts with "Polaroid".
*/
- (void) findPairedDevices {
NSArray *pairedDevices = [IOBluetoothDevice pairedDevices];
devicesTested = [NSMutableArray arrayWithCapacity:0];
for (IOBluetoothDevice *device in pairedDevices)
{
if ([self deviceQualifiesForAddOrRenew:device.name])
{
BluetoothPushDevice *pushDevice = [[BluetoothPushDevice new] initWithDevice:device];
if (pushDevice != nil)
{
[availableDevices addObject:pushDevice];
[pushDevice testConnection];
}
}
}
}
最后一个函数调用是BluetoothPushDevice的内置方法来测试连接.这是响应的委托处理程序：
- (void) deviceStatusHandler: (NSNotification *)notification {
BluetoothPushDevice *device = [notification object];
NSString *status = [[notification userInfo] objectForKey:@"message"];
if ([devicesTested count] < [availableDevices count] && ![devicesTested containsObject:device.name]) {
[devicesTested addObject:device.name];
}
}
在服务器启动时,此方法将响应计时器滴答或手动扫描运行：
- (void) checkWatchedFolder {
NSError *error = nil;
NSArray *properties = [NSArray arrayWithObjects: NSURLLocalizedNameKey, NSURLCreationDateKey, NSURLLocalizedTypeDescriptionKey, nil];
NSArray *files = [[NSFileManager defaultManager]
contentsOfDirectoryAtURL:watchFolderPath
includingPropertiesForKeys:properties
options:(NSDirectoryEnumerationSkipsHiddenFiles)
error:&error];
if (files == nil) {
[self log:@"Error reading watched folder"];
return;
}
if ([files count] > 0) {
int newFileCount = 0;
for (NSURL *url in files) {
if (![filesInTransit containsObject:[url path]]) {
NSLog(@"New file: %@", [url lastPathComponent]);
[self sendFile:[url path]];
newFileCount++;
}
}
}
}
找到新文件后,首先需要找到一个不忙于收到打印文件的设备：
/*
Loops through all discovered device service records and returns the a new OBEX session for
the first it finds that is not connected (meaning it is not currently in use, connections are
ad-hoc per print).
*/
- (BluetoothPushDevice*) getIdleDevice {
for (BluetoothPushDevice *device in availableDevices) {
if ([device.status isEqualToString:kBluetoothDeviceStatusReady]) {
return device;
}
}
return nil;
}
然后使用此方法发送文件：
- (void) sendFile:(NSString *)filePath {
BluetoothPushDevice *device = [self getIdleDevice];
if( device != nil ) {
NSLog(@"%@ is available", device.name);
if ([device sendFile:filePath]) {
[self log:[NSString stringWithFormat:@"Sending file: %@", filePath]];
[filesInTransit addObject:filePath];
}
else {
[self log:[NSString stringWithFormat:@"Error sending file: %@", filePath]];
}
}
else {
NSLog(@"No idle devices");
}
}
传输完成后,将调用此委托方法：
/*
Responds to BluetoothPushDevice's TransferComplete notification
*/
- (void) transferStatusHandler: (NSNotification *) notification {
NSString *status = [[notification userInfo] objectForKey:@"message"];
NSString *file = ((BluetoothPushDevice*)[notification object]).file;
if ([status isEqualToString:kBluetoothTransferStatusComplete]) {
if ([filesInTransit containsObject:file]) {
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error = nil;
[fileManager removeItemAtPath:file error:&error];
if (error != nil) {
[self log:[NSString stringWithFormat:@"**ERROR** File %@ could not be deleted (%@)", file, error.description]];
}
[self log:[NSString stringWithFormat:@"File deleted: %@", file]];
[filesInTransit removeObject:file];
}
else {
[self log:[NSString stringWithFormat:@"**ERROR** filesInTransit array does not contain file %@", file]];
}
}
[self updateDeviceStatusDisplay];
}
我希望这可以帮助别人！
