用照相机照相并保存上传服务器等操作

参考：http://www.apple.com.cn/developer/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/AdvancedFeatures/AdvancedFeatures.html#//apple_ref/doc/uid/TP40007072-CH14-SW13

.h文件如下：
     #import <UIKit/UIKit.h>
    @interface FirstViewController :      UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate> {//要引入这两个协议
    UIButton *_button;
    UIImagePickerController *_pick;
}
-(IBAction)button_click:(id)sender;
@property(nonatomic,retain)UIImagePickerController *pick;
@property(retain,nonatomic)IBOutlet UIButton *button;
@end

.m文件如下：

//保存图片到Document
- (void)saveImage:(UIImage *)tempImage{
    NSData* imageData = UIImagePNGRepresentation(tempImage);
    NSString* imageNameStr = @"1.png";
   
    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString* documentsDirectory = [paths objectAtIndex:0];
    // Now we get the full path to the file
    NSString* fullPathToFile = [documentsDirectory stringByAppendingPathComponent:imageNameStr];
    // and then we write it out
    [imageData writeToFile:fullPathToFile atomically:NO];
   
}
-(IBAction)button_click:(id)sender{
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        return;
    }
    self.pick = [[UIImagePickerController alloc] init];
    self.pick.delegate = self;
   // self.pick.sourceType = UIImagePickerControllerSourceTypeCamera;//调用相机
    self.pick.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//调用手机图片库
    self.pick.allowsEditing = NO;//是否开启图片编辑功能
    [self presentModalViewController:self.pick animated:YES];
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{
     //image表示用相机拍摄的原始图片或是从图片库选择的图片，没有经过编辑的
     //editingInfo表示经过编辑的图片信息，若图片编辑功能没开启，此值为nil
    //其key值说明如下：
   //URL:  https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImagePickerControllerDelegate_Protocol/UIImagePickerControllerDelegate/UIImagePickerControllerDelegate.html#//apple_ref/doc/constant_group/Editing_Information_Keys

    //UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);／／iOS-将图片保存到照片相册中   
    [self saveImage:image];
    [[self.pick parentViewController] dismissModalViewControllerAnimated:YES];
    [self.pick release];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [[self.pick parentViewController] dismissModalViewControllerAnimated:YES];
    [self.pick release];
}


相关说明：
iOS-将图片保存到照片相册中 ：
     

UIImageWriteToSavedPhotosAlbum(drawImage.image, nil, nil, nil);

这里drawImage是一个UIImageView。

为nil的参数，可在UIKit Function Reference中查到。UIImageWriteToSavedPhotosAlbum是UIKit框架中的一个函数。

这里说一下后面三个参数的含义：

1 2 3 4 5 6

void UIImageWriteToSavedPhotosAlbum ( UIImage *image, id completionTarget, SEL completionSelector, void *contextInfo );

id是target对象，sel是selector，即target对象上的方法名，contextInfo是任意指针，会传递到selector定义的方法上。一般是当完成后调用方法时使用，或者在完成时出错的处理。

图片上传至服务器：客户端采用ASIHttpRequest.h这个开源库

服务器端：（php）

<?php //upload即是app那边 setFile 函数中后面的那个forKey参数
if (true)
  {
  if ($_FILES["upload"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["upload"]["error"] . "<br />";
    }
  else
    {
    echo "Upload: " . $_FILES["upload"]["name"] . "<br />";
    echo "Type: " . $_FILES["upload"]["type"] . "<br />";
    echo "Size: " . ($_FILES["upload"]["size"] / 1024) . " Kb<br />";
    echo "Temp upload: " . $_FILES["upload"]["tmp_name"] . "<br />";

    if (file_exists($_FILES["upload"]["name"]))
      {
      echo $_FILES["upload"]["name"] . " already exists. ";
      }
    else
      {
      move_uploaded_file($_FILES["upload"]["tmp_name"],
      $_FILES["upload"]["name"]);
      echo "Stored in: " .$_FILES["upload"]["name"];
      }
    }
  }
else
  {
  echo "Invalid upload";
  }
?>

客户端：

NSURL *url = [NSURL URLWithString:@"http://192.168.10.199/tmart/app_file.php?file=upload"];
    ASIFormDataRequest *req = [ASIFormDataRequest requestWithURL:url];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [paths objectAtIndex:0];
    NSString *filename = [path stringByAppendingPathComponent:@"tmart.sql"];
    [req setFile:filename forKey:@"upload"];
    [req setDelegate:self];
    [req setDidFinishSelector:@selector(suc:)];
    [req startSynchronous];