Question

In my iPhone app I need to capture a picture and save it in to the sqlite database.

 NSString *insertQuery = [NSString stringWithFormat:@"INSERT INTO ProfileTable (NAME, MOBILE, EMAIL, ProfilePICTURE) VALUES(?, ?, ?, ?)"];

                  const char *insert = [insertQuery UTF8String];
                  if(sqlite3_prepare_v2(contactsDB, insert, -1, &insertStatement, NULL) != SQLITE_OK) {
                        NSLog(@"Error while creating insert Statement");
                  }
                  else 
                  {
                        sqlite3_bind_text(insertStatement, 1, [name UTF8String], -1, SQLITE_TRANSIENT);
                        sqlite3_bind_text(insertStatement, 2, [mobile UTF8String], -1, SQLITE_TRANSIENT);
                        sqlite3_bind_text(insertStatement, 2, [email UTF8String], -1, SQLITE_TRANSIENT);


                        sqlite3_bind_blob(insertStatement, 4, [profilePic bytes], [contactImage length], NULL);




                  }
            }


// Same Query  for insert statement also

I saved that file in the form of blob type but that cause to occupy huge memory and causes to memory warnings.

So i have an idea that.

I want to save the captured image as a png file for suppose “image1.png” and insert that title “image1.png” as a varchar type and the retrieve that file having that name when we want to display.

any help how to do this

Answer 1

Get the document directory (or other directory that you might want to store the images):

/**
 Returns the URL to the application's Documents directory.
 */
- (NSURL *)applicationDocumentsDirectory
{
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}

Store image as png:

NSURL *documentsDirURL = [self applicationDocumentsDirectory];
NSURL *fileURL = [documentsDirURL URLByAppendingPathComponent:@"some-image-name.png"];
NSData* data = UIImagePNGRepresentation(image);
[data writeToURL:fileURL atomically:YES];
NSString *filePath = [fileURL path];

// now save your filePath as string to sqlite

Note, you’ll have to fill in details, such as where the appropriate directory is in the filesystem, a naming convention, generating filenames unless they exist already etc.

EDIT:

Here’s some help with serial naming of the images. There are a lot of different solutions.

Create an entry in the NSUserDefaults with the key @"lastImageNumber". When you need a new image name:

NSInteger imageNumber = [[NSUserDefaults standardUserDefaults] integerForKey:@"lastImageNumber"] + 1;
NSString *imageName = [NSString stringWithFormat:@"image%05d.png",imageNumber];
// save the new imageNumber in the `NSUserDefaults`
[[NSUserDefaults standardUserDefaults] setInteger:imageNum ForKey:@"lastImageNumber"];