Ipad development saves images to files

 

Images downloaded from the Internet, if you want to achieve permanent storage, need to be saved to files or databases, the current file io is the fastest, haha

 

The core code is as follows:

 

-(NSString *) findUniqueSavePath

 

{

 

Int I = 1;

 

NSString * path;

 

Do {

 

// This loop knows how to save a new image ......

 

Path = [NSString stringWithFormat: @ "% @/Documents/IMAGE _ % 04d. PNG", NSHomeDirectory (), I ++];

 

} While ([[NSFileManager defaultManager] fileExistsAtPath: path]);

 

 

Return path;

 

}

 

 

-(Void) imagePickerController :( UIImagePickerController *) picker didFinishPickingMediaWithInfo :( NSDictionary *) info

 

{

 

UIImage * image = [info objectForKey: @ "UIImagePickerControllerOriginalImage"];

 

[Self dismissModalViewControllerAnimated: YES];

 

[Picker release];

 

 

// Png and jpeg modes for file writing

 

// [UIImageJPEGRepresentation (image, 1.0f) writeToFile: [self findUniqueSavePath] atomically: YES];

 

[UIImagePNGRepresentation (image) writeToFile: [self findUniqueSavePath] atomically: YES];

 

 

// Set the current window to Beijing

 

SETIMAGE (image );

 

 

// Display the list of currently written files

 

CFShow ([[NSFileManager defaultManager] directoryContentsAtPath: [NSHomeDirectory () stringByAppendingString: @ "/Documents"]);

 

}

 

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For how to read images in a file, see my previous blog.

 

Author sdhjob