文章/答案/技术大牛

发布

问使用压缩jpeg数据时出错
EN

Stack Overflow用户

提问于 2011-01-16 22:01:02

回答 1查看 1.2K关注 0票数 0

当我尝试使用UIImageJPEGRepresentation(image, 0.5f);压缩一些jpeg数据时，我得到了以下错误

<Error>: Unsupported pixel description - 4 components, 8 bits-per-component, 32 bits-per-pixel
<Error>: CGBitmapContextCreateWithDictionary: failed to create delegate.
<Error>: CGImageDestinationAddImage image could not be converted to destination format.
<Error>: CGImageDestinationFinalize image destination does not have enough images

下面是我下载和压缩数据的代码片段……

ASIHTTPRequest *request = [[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:object.largeimage]];
[request startSynchronous];

NSData *imageData = [request responseData];

UIImage *image = [[UIImage alloc] initWithData:imageData];
NSData *compressedImageData = UIImageJPEGRepresentation(image, 0.5f);

//If the data was compressed properly...
if(compressedImageData) [compressedImageData writeToFile:filePath atomically:YES];

//If it wasn't...
else [imageData writeToFile:filePath atomically:YES];

[image release];

if(request.responseStatusCode == 200)
object.fullImageFilename = filePath;

[request release];

请求释放；

提前感谢您的帮助:)

iphone-sdk-3.0

uiimage

cgimage

回答 1

Stack Overflow用户

回答已采纳

发布于 2011-01-17 02:22:15

仍然不确定“正确的答案”，但我设法为任何感兴趣的人找到了一个解决方法:)

ASIHTTPRequest *request = [[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:object.largeimage]];
[request startSynchronous];

NSData *imageData = [request responseData];

UIImage *image = [[UIImage alloc] initWithData:imageData];
NSData *compressedImageData = UIImageJPEGRepresentation(image, 0.5f);

//If the data was compressed properly...
if(compressedImageData) [compressedImageData writeToFile:filePath atomically:NO];

//If it wasn't...
else
{
    UIGraphicsBeginImageContext(image.size);
    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    compressedImageData = UIImageJPEGRepresentation(newImage, 0.5f);
    [compressedImageData writeToFile:filePath atomically:NO];
    [newImage release];
}

[image release];

if(request.responseStatusCode == 200)
    object.fullImageFilename = filePath;

[request release];

票数 3

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/4705737

复制

相似问题

问使用压缩jpeg数据时出错
EN

回答 1

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用压缩jpeg数据时出错EN

回答 1

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用压缩jpeg数据时出错
EN