将BLOB图像从NSData转换为NSString，以便可以在HTML UIWebView中显示 [英] Convert BLOB image from NSData to NSString so it can be displayed in HTML UIWebView

问题描述

所以我成功地从数据库中检索了我的BLOB图像，并将其设置为NSData * content ..

So I successfully retrieved my BLOB image from the database and set it to NSData *content..

content = [[NSData alloc]
       initWithBytes:sqlite3_column_blob(query, 16)
       length:sqlite3_column_bytes(query, 16)];

我想做的是将这些内容放入NSString中，因为我想将此字符串传递给javascript并显示图像.我不确定这是否可能，但是我已经阅读了下面的链接，您可以在base64的css/html中显示图像. http://mark.koli.ch/2009/07/howto-include-binary-image-data-in-cascading-style-sheets-css.html

What I am trying to do is to get this content into a NSString, because I would like to then pass this string to javascript and display the image. I am not exactly sure if this is even possible, but i have read on the link below that you can display images in css/html in base64. http://mark.koli.ch/2009/07/howto-include-binary-image-data-in-cascading-style-sheets-css.html

我遇到的问题是将NSData转换为NSString，这样我就可以将其放入我的 UIWebView的loadHTMLString ....我不能使用UIImage，必须是UIWebView.

The issue I am having is converting my NSData to an NSString so I can then put it into my UIWebView's loadHTMLString....I cannot use a UIImage, must be a UIWebView.

谢谢！ 格雷格

推荐答案

content = [[NSData alloc] initWithBytes:sqlite3_column_blob(query, 16) length:sqlite3_column_bytes(query, 16)]; NSString *path = [webDirectory stringByAppendingPathComponent:@"image.png"]; [content writeToFile:path atomically:NO]; [content release]; 

我能够通过将文件写成png来找出解决方案.其中webDirectory是您选择的目录

I was able to figure out my solution by writing the file out to a png. Where webDirectory is your directory of choice

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