Question

我正在开发一个iPhone应用程序，其中NSData到UIImageJPEGRepresentation中的相机图像存储现在我想将此NSData转换为字符串。在goggling之后我发现base64会这样做。

我想知道，如果我将它编码到base64然后将其发送到php服务器，那么就可以对其进行解码并转换为Image。

我首先问here如何将带有坐标和图像描述的图像发送到php服务器但我无法得到响应，所以现在我想将图像转换为base64，然后将其发送到带有坐标和图像描述的php服务器

希望有人知道解决方案！

Answer 1

Base64是一种标准，并且受到包括PHP在内的大多数语言的支持，所以它可以工作。但这可能不是最好的方法，因为base64将有效负载大小增加了33％。您应该考虑将其作为二进制而不是字符串发送，这也将更好地支持流式传输，并且将使用更少的内存并在客户端和服务器上更快地工作。你应该只在小数据上使用base64，或者没有更好的选择。

Answer 2

查看以下网址。它可能会给你你想要的东西。

http://www.iphonedevsdk.com/forum/iphone-sdk-development/49247-posting-image-web-server-using-soap.html

Answer 3

这对我来说听起来不太好。一些http客户端为图像上传提供了很好的支持。看看ASIHttpRequest。您可以将数据保存到临时文件，然后上载该文件。我之前没有使用过addData方法，看起来你可以直接上传NSData对象。

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request addPostValue:@"Ben" forKey:@"names"];
[request addPostValue:@"George" forKey:@"names"];
[request addFile:@"/Users/ben/Desktop/ben.jpg" forKey:@"photos"];
[request addData:imageData withFileName:@"george.jpg" andContentType:@"image/jpeg" forKey:@"photos"];

Answer 4

按照此代码将图像和变量发送到服务器 -

// Implement this method in your code to do something with the image.
- (void)useImage:(UIImage*)theImage
{
    /*
     turning the image into a NSData object
     getting the image back out of the UIImageView
     setting the quality to 90
     */

    NSData *imageData = UIImageJPEGRepresentation(theImage, 90);
    // setting up the URL to post to


    NSString *urlString=[SiteUrl    stringByAppendingString:@"iphone_upload_photo.php?type=colleague&token="];
    urlString=[urlString stringByAppendingString:PublicToken];





    // setting up the request object now
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];

    /*
     add some header info now
     we always need a boundary when we post a file
     also we need to set the content type

     You might want to generate a random boundary.. this is just the same

     */
    NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    /*
     now lets create the body of the post
     */
    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"ipodfile.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    // setting the body of the post to the reqeust
    [request setHTTPBody:body];

    // now lets make the connection to the web
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    [self LoadContent];



}

如何在iPhone SDK中将NSData转换为字符串？

4 个答案: