将UIImage转换为NSData [英] convert UIImage to NSData

问题描述

我在我的应用程序中使用此代码，这将帮助我发送图像。

但是，我有一个图像视图的图像。我没有在appbundle文件，但有我的身边的形象。如何更改以下代码？任何人都可以告诉我如何将 myimage 转换为 NSData ？

  //将图片附加到电子邮件
 NSString * path = [[NSBundle mainBundle] pathForResource：@rainyofType：@jpg]; 
 NSData * myData = [NSData dataWithContentsOfFile：path]; 
 [picker addAttachmentData：myData mimeType：@image / jpegfileName：@rainy]; 
  

解决方案

根据您的图片格式，尝试以下操作之一：

返回指定图像的JPEG格式的数据。

  NSData * UIImageJPEGRepresentation（
 UIImage * image，
 CGFloat compressionQuality 
）; 
 





UIImagePNGRepresentation

以PNG格式返回指定图片的数据





  NSData * UIImagePNGRepresentation $ b UIImage * image 
）; 
  

这是文档。

编辑： / p>

如果你想访问构成UIImage的原始字节，你可以使用这种方法：

  CGDataProviderRef provider = CGImageGetDataProvider（image.CGImage）; 
 NSData * data =（id）CFBridgingRelease（CGDataProviderCopyData（provider））; 
 const uint8_t * bytes = [data bytes]; 
  

这将给出图像RGB像素的低级表示。
（如果不使用ARC，则省略 CFBridgingRelease 位）。

I am using this code in my app which will help me to send a image.

However, I have an image view with an image. I have no file in appbundle but have the image in my side. How can I change the below code ? Can anyone tell me how can I convert myimage to NSData ?

// Attach an image to the email
NSString *path = [[NSBundle mainBundle] pathForResource:@"rainy" ofType:@"jpg"];
NSData *myData = [NSData dataWithContentsOfFile:path];
[picker addAttachmentData:myData mimeType:@"image/jpeg" fileName:@"rainy"];

解决方案

Try one of the following, depending on your image format:

UIImageJPEGRepresentation

Returns the data for the specified image in JPEG format.

NSData * UIImageJPEGRepresentation (
   UIImage *image,
   CGFloat compressionQuality
);

UIImagePNGRepresentation

Returns the data for the specified image in PNG format

NSData * UIImagePNGRepresentation (
   UIImage *image
);

Here the docs.

EDIT:

if you want to access the raw bytes that make up the UIImage, you could use this approach:

CGDataProviderRef provider = CGImageGetDataProvider(image.CGImage);
NSData* data = (id)CFBridgingRelease(CGDataProviderCopyData(provider));
const uint8_t* bytes = [data bytes];

This will give you the low-level representation of the image RGB pixels. (Omit the CFBridgingRelease bit if you are not using ARC).

这篇关于将UIImage转换为NSData的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！