我有两个UI
ImageViews.我想通过脚本将两个图像发布到服务器.在此之前,我必须将这些图像转换为数据和数据到字符串,但我不知道如何将图像从UIImageView转换为NSData和NSData转换为NSString.I已经引用了所有代码,但它不起作用.我还想知道在我的代码中应该在哪里声明转换编码(图像到数据和数据到图像)？
这就是我实施的内容
.h部分
#import <UIKit/UIKit.h>
#import "GlobalAccessClass.h"
#import <QuartzCore/QuartzCore.h>
@interface AskQuestionHome : UIViewController<UITextViewDelegate,UITextFieldDelegate,UIImagePickerControllerDelegate,UIActionSheetDelegate>
{
}
@property (strong,nonatomic) IBOutlet UIImageView *imgSecondImg;
@property (strong,nonatomic) IBOutlet UIImageView *imgFirstImg;
@property (strong,nonatomic) IBOutlet UITextView *txtviewAsk;
-(IBAction)postbutton:(id)sender;
@property (nonatomic,retain) NSString *datestr;
@property(nonatomic,retain) NSData *imageData;
@property(nonatomic,retain) NSString *postLength;
@end
.m部分
-(void)post
{
NSMutableURLRequest *mutableurlrequest = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:@"http://www.alvinchuastudios.com/aNSWERED/insert_question.PHP"]];
// create the Method "POST" For POSTING the QUESTIION with IMAGES
[mutableurlrequest setHTTPMethod:@"POST"];
NSLog(@"the email is:%@",manage.transformEmail);
NSLog(@"the cat is:%@",manage.transformCategories);
NSLog(@"the text is:%@",textviewText.text);
// NSLog(@"the firstimage is:%ld",(long)imgFirstImg.tag);
// NSLog(@"the secondimage is:%ld",(long)imgSecondImg.tag);
// NSlog(@"the status is:%d",1);
NSLog(@"the user is:%@",manage.transformName);
NSLog(@"the user registered is:%@",datestr);
//passing the string to the server
NSString *qususerUpdate =[NSString stringWithFormat:@"email_id=%@&cat=%@&q_text=%@&q_image1=%ld&q_image2=%ld&q_status=1&last_upd_by=%@&last_upd_timestamp=%@",manage.transformEmail,manage.transformCategories,textviewText.text,(long)imgFirstImg.tag,(long)imgSecondImg.tag,manage.transformName,datestr,Nil];
//check the value that what we passed
NSLog(@"the data Details is =%@",qususerUpdate);
//Convert the String to Data
NSData *data1 =[qususerUpdate dataUsingEncoding:NSUTF8StringEncoding];
//Apply the data to the body
[mutableurlrequest setHTTPBody:data1];
//Create the response and Error
NSError *err;
NSURLResponse *response;
NSData *responseData =[NSURLConnection sendSynchronousRequest:mutableurlrequest returningResponse:&response error:&err];
NSString *resStr =[[NSString alloc]initWithData:responseData encoding:NSASCIIStringEncoding];
//This is for Response
NSLog(@"got response==%@",resStr); }
解决方法
我认为Ashu的回答将返回null.尝试这个
NSData *dataImage = [[NSData alloc] init]; dataImage = UIImagePNGRepresentation(image); NSString *stringImage = [dataImage base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
