Problems with UIImagePNGRepresentation

Question

I'm trying to use this line of code

 [UIImagePNGRepresentation(image, 1.0) writeToFile:pngPath atomically:YES];

But obviously pngPath is undeclared. So I have to use stringByAppendingPathComponent.

I googled examples of this, and I found this

myPlistPath = [documentsDirectory stringByAppendingPathComponent: 
 [NSString stringWithFormat: @"%@.plist", plistName] ];
[myPlistPath retain]

;

The problem is that I don't have a plist file, because I don't need one. How can I solve all these issues and writeToFile the UIImage image?

score 1 · Accepted Answer · edited Mar 24 '12 at 14:51

1

I don't fully understand your question, but to get the full path where your file should be saved, you could try this:

NSString *file = @"myfile.png";
NSString *directory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0];
NSString *path = [directory stringByAppendingPathComponent: file];

and then:

[UIImagePNGRepresentation(image) writeToFile:path atomically:YES];

edited Mar 24 '12 at 14:51

Rok Jarc

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answered Nov 04 '10 at 14:37

ySgPjx

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Thanks! That was exactly my question. The only thing is I get 1 error: Too many arguments to function 'UIImagePNGRepresentation'. Here's my code, it's just was what you gave me. – Joethemonkey101 Nov 04 '10 at 14:52
NSString *file = @"GameOver Screenshot"; NSString *directory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *path = [directory stringByAppendingPathComponent:file]; [UIImagePNGRepresentation(image, 1.0) writeToFile:path atomically:YES]; return image; – Joethemonkey101 Nov 04 '10 at 14:52
Yeah, sorry; I copy'n pasted the code in your question. It should be `UIImagePNGRepresentation(image)`. The second parameter is only there for `UIImageJPEGRepresentation` (it's the quality parameter). Please consider upvoting/accepting the answer if it helped. Thanks. – ySgPjx Nov 04 '10 at 14:57

Problems with UIImagePNGRepresentation

1 Answers1