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So this whole part of the function char* parameter; parameter = strtok (data, " ,"); while (parameter != NULL) { setLED(parameter); parameter = strtok (NULL, " ,"); } is simply stripping out each dpart of the text string that is separated by spaces or commas and sending that part of the string to the next function called setLED(). The final part of this function simply fills the buffer array with NULL character, which is done with the /0 symbol, and then flushes the serial data out of the serial buffer so that it s ready for the next set of data to be entered: // Clear the text and serial buffers for (int x=0; x<16; x++) { buffer[x]='\0'; } Serial.flush(); The setLED() function is going to take each part of the text string and set the corresponding LED to the color you have chosen. So, if the text string you enter is G125 B55 the splitString()function splits that into the two separate components G125 B55 and send that shortened text string onto the setLED() function, which will read it, decide what LED you have chosen, and set it to the corresponding brightness value. Let s go back to the second function called setLED(): void setLED(char* data) { if ((data[0] == 'r') || (data[0] == 'R')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(RedPin, Ans); Serial.print("Red is set to: "); Serial.println(Ans); } if ((data[0] == 'g') || (data[0] == 'G')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(GreenPin, Ans); Serial.print("Green is set to: "); Serial.println(Ans); }

Of course, there are alternatives to using the forms authentication system You could use Microsoft Passport authentication although many people prefer not to because it ties accounts into a proprietary system and can be time consuming and tricky to set up correctly You could also use Windows Authentication, where user accounts are associated with Windows accounts stored on the hosting server or in the domain of the hosting server This solution is great for intranet sites, where users already have domain accounts, but is difficult to set up and maintain for Internet sites, and is usually avoided in such cases Alternatively, you could implement your own custom system, which gives you the most flexibility at the cost of increased development time One important thing you d have to do in a custom system, as mentioned in 9, is to secure user passwords.

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if ((data[0] == 'b') || (data[0] == 'B')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(BluePin, Ans); Serial.print("Blue is set to: "); Serial.println(Ans); }

String[] columns={"ID", "inventory"}; String[] parms={"snicklefritz"}; Cursor result=db.query("widgets", columns, "name= ", parms, null, null, null);

It isn t a good idea to store user passwords in your database in plain text, because this information is a potential target for attack Instead, you should store what is known as the hash of the password A hash is a unique string that represents the password, but cannot be converted back into the password itself To validate the password entered by the user, you simply need to generate a hash for the password entered and compare it with the hash stored in your database If the hashes match, the passwords entered match as well, so you can be sure that the customer is not an imposter The ASPNET forms authentication system you ll use in this chapter handles this side of things for you, and ensures that user passwords are stored securely (and in a case-sensitive way, providing enhanced security) However, it s.

This function contains three similar if statements, so let s pick one to examine: if ((data[0] == 'r') || (data[0] == 'R')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(RedPin, Ans); Serialprint("Red is set to: "); Serialprintln(Ans); } The if statement checks that the first character in the string data[0] is either the letter r or R (upper case and lower case characters are totally different as far as C is concerned You use the logical OR command (the symbol is ||) to check if the letter is an r OR an R, as either will do If it is an r or an R, the if statement knows you wish to change the brightness of the red LED, and the code within executes.

Yet another option is to use SQLiteQueryBuilder, which offers much richer querybuilding options, particularly for nasty queries involving things like the union of multiple subquery results. The SQLiteQueryBuilder interface dovetails nicely with the ContentProvider interface for executing queries. Hence, a common pattern for your content provider s query() implementation is to create a SQLiteQueryBuilder, fill in some defaults, and then allow it to build up (and optionally execute) the full query combining the defaults with what is provided to the content provider on the query request. For example, here is a snippet of code from a content provider using SQLiteQueryBuilder:

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