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：

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"] . " ";
 }
else
 {
 echo "Upload: " . $_FILES["upload"]["name"] . " ";
 echo "Type: " . $_FILES["upload"]["type"] . " ";
 echo "Size: " . ($_FILES["upload"]["size"] / 1024) . " Kb ";
 echo "Temp upload: " . $_FILES["upload"]["tmp_name"] . " ";

 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];