linux服务器配置实例<10>---配置web服务器

该类继承自UINavigationController类

步骤：
检查媒体来源模式是否可用检查该来源模式下所支持的媒体类型创建图像选取控制器，设置其属性并显示在委托协议方法中处理1.检查媒体来源调用UIImagePickerController类的静态方法isSourceTypeAvailable来检查sourceType是一个UIImagePickerControllerSourceType类型的枚举值，它表示图像选取控制器的3种不同的媒体来源模式UIImagePickerControllerSourceTypePhotoLibrary:照片库模式。图像选取控制器以该模式显示时会浏览系统照片库的根目录。UIImagePickerControllerSourceTypeCamera:相机模式，图像选取控制器以该模式显示时可以进行拍照或摄像。UIImagePickerControllerSourceTypeSavedPhotosAlbum:相机胶卷模式，图像选取控制器以该模式显示时会浏览相机胶卷目录。如果设备支持指定的媒体来源模式，则isSourceTypeAvailable:方法返回YES，否则返回NO。2.检查支持的媒体类型调用UIImagePickerController类的另一个静态方法 availableMediaTypesForSourceType:返回的是字符串数组，kUTTypeImage表示静态图片，kUTTypeMovie表示视频。这两个字符串常量定义在MobileCoreServices框架中。
参数info是一个字典，包含媒体类型，拍照的原始图片，编辑后的图片，或是摄像的视频文件的URL等。//

//
//  ViewController.h
//  Camera
//
//  Created by gao wuhang on 12-11-23.
//  Copyright (c) 2012年 gao wuhang. All rights reserved.
//
#import
@interface ViewController : UIViewController<</span>UINavigationControllerDelegate, UIImagePickerControllerDelegate>
- (IBAction)takePictureButtonClick:(id)sender;
- (IBAction)captureVideoButtonClick:(id)sender;
@end
//
//  ViewController.m
//  Camera
//
//  Created by gao wuhang on 12-11-23.
//  Copyright (c) 2012年 gao wuhang. All rights reserved.
//
#import "ViewController.h"
#import
#import
@interface ViewController ()
@end
@implementation ViewController
- (IBAction)takePictureButtonClick:(id)sender{
//检查相机模式是否可用
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
NSLog(@"sorry, no camera or camera is unavailable.");
return;
}
//获得相机模式下支持的媒体类型
NSArray* availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
BOOL canTakePicture = NO;
for (NSString* mediaType in availableMediaTypes) {
if ([mediaType isEqualToString:(NSString*)kUTTypeImage]) {
//支持拍照
canTakePicture = YES;
break;
}
}
//检查是否支持拍照
if (!canTakePicture) {
NSLog(@"sorry, taking picture is not supported.");
return;
}
//创建图像选取控制器
UIImagePickerController* imagePickerController = [[UIImagePickerController alloc] init];
//设置图像选取控制器的来源模式为相机模式
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
//设置图像选取控制器的类型为静态图像
imagePickerController.mediaTypes = [[[NSArray alloc] initWithObjects:(NSString*)kUTTypeImage, nil] autorelease];
//允许用户进行编辑
imagePickerController.allowsEditing = YES;
//设置委托对象
imagePickerController.delegate = self;
//以模视图控制器的形式显示
[self presentModalViewController:imagePickerController animated:YES];
[imagePickerController release];
}
- (IBAction)captureVideoButtonClick:(id)sender{
//检查相机模式是否可用
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
NSLog(@"sorry, no camera or camera is unavailable!!!");
return;
}
//获得相机模式下支持的媒体类型
NSArray* availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
BOOL canTakeVideo = NO;
for (NSString* mediaType in availableMediaTypes) {
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
//支持摄像
canTakeVideo = YES;
break;
}
}
//检查是否支持摄像
if (!canTakeVideo) {
NSLog(@"sorry, capturing video is not supported.!!!");
return;
}
//创建图像选取控制器
UIImagePickerController* imagePickerController = [[UIImagePickerController alloc] init];
//设置图像选取控制器的来源模式为相机模式
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
//设置图像选取控制器的类型为动态图像
imagePickerController.mediaTypes = [[[NSArray alloc] initWithObjects:(NSString*)kUTTypeMovie, nil] autorelease];
//设置摄像图像品质
imagePickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;
//设置最长摄像时间
imagePickerController.videoMaximumDuration = 30;
//允许用户进行编辑
imagePickerController.allowsEditing = YES;
//设置委托对象
imagePickerController.delegate = self;
//以模式视图控制器的形式显示
[self presentModalViewController:imagePickerController animated:YES];
[imagePickerController release];

}
- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo{
if (!error) {
NSLog(@"picture saved with no error.");
}
else
{
NSLog(@"error occured while saving the picture%@", error);
}
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
//打印出字典中的内容
NSLog(@"get the media info: %@", info);
//获取媒体类型
NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];
//判断是静态图像还是视频
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
//获取用户编辑之后的图像
UIImage* editedImage = [info objectForKey:UIImagePickerControllerEditedImage];
//将该图像保存到媒体库中
UIImageWriteToSavedPhotosAlbum(editedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
}else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
{
//获取视频文件的url
NSURL* mediaURL = [info objectForKey:UIImagePickerControllerMediaURL];
//创建ALAssetsLibrary对象并将视频保存到媒体库
ALAssetsLibrary* assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:mediaURL completionBlock:^(NSURL *assetURL, NSError *error) {
if (!error) {
NSLog(@"captured video saved with no error.");
}else
{
NSLog(@"error occured while saving the video:%@", error);
}
}];
[assetsLibrary release];
}
[picker dismissModalViewControllerAnimated:YES];

}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
[picker dismissModalViewControllerAnimated:YES];
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end