通过调用系统摄像头拍照,拍视频,然后写入文件的

如果您的App里需要获得由系统自带的照相机、摄像机和录音软件所生成的文件。可以借鉴以下代码来调用iPhone摄像头拍照或者摄像的功能，并把获得的数据直接写入到文件。

//这一段是,点击一个takePicture按钮的操作.
- (IBAction)takePicture:(id)sender {

UIImagePickerController *picker = [[UIImagePickerController alloc] init];

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
NSArray *temp_MediaTypes = [UIImagePickerController availableMediaTypesForSourceType:picker.sourceType];
picker.mediaTypes = temp_MediaTypes;
picker.delegate = self;
picker.allowsImageEditing = YES;
}

[self presentModalViewController:picker animated:YES];
[picker release];

}
//下面两个函数是遵守 UIImagePickerControllerDelegate这个协议所实现的类.这样就能够完整的实现,获取照片或者视频,然后写入文件的过程.
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];

BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

if ([mediaType isEqualToString:@"public.image"]){

UIImage *image = [info objectForKey:@"UIImagePickerControllerEditedImage"];
NSLog(@"found an image");

NSString *imageFile = [documentsDirectory stringByAppendingPathComponent:@"temp.jpg"];
NSLog(@"%@", imageFile);

success = [fileManager fileExistsAtPath:imageFile];
if(success) {
success = [fileManager removeItemAtPath:imageFile error:&error];
}

imageView.image = image;
[UIImageJPEGRepresentation(image, 1.0f) writeToFile:imageFile atomically:YES];

//SETIMAGE(image);
//CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);
}
else if([mediaType isEqualToString:@"public.movie"]){
NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
NSLog(@"%@", videoURL);
NSLog(@"found a video");
NSData *videoData = [NSData dataWithContentsOfURL:videoURL];

/****************************************/

NSString *videoFile = [documentsDirectory stringByAppendingPathComponent:@"temp.mov"];
NSLog(@"%@", videoFile);

success = [fileManager fileExistsAtPath:videoFile];
if(success) {
success = [fileManager removeItemAtPath:videoFile error:&error];
}
[videoData writeToFile:videoFile atomically:YES];
//CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);
//NSLog(videoURL);
}
[picker dismissModalViewControllerAnimated:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

[picker dismissModalViewControllerAnimated:YES];

}

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