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edited Jan 9, 2018 at 19:40

dda

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Char* and string conversion from an esp8266 webserverESP8266 web server

I have the following arduinoArduino code for configuring a wifi connection through a simple webpage:

I declare:

char* ssid;

char* ssid;. Later I read a value from a SPIFFS config file where q_ssid ifq_ssid is declared as a string and successfully populated from the file:

strncpy(ssid, q_ssid.c_str(), 10 );

In the line above, I am limiting it to exactly 10 as that is the length of my wifi AP name that this connects to.If If I change the initial char*char* to:

char ssid[10];

then char ssid[10];, all works well, but SSIDs can have varying names, and if I do not use 10 chars, then the trailing spaces prevent connection in the statement: WiFi.begin(ssid, password);.

WiFi.begin(ssid, password);

On the webclientweb client handler that reads in values from the user, I use this:

String q_ssid = server.arg("ssid");
strncpy(ssid, q_ssid.c_str(), 10 );

My question here is howHow can I dynamically assign the size of: char* ssid; So char* ssid; so that it can be used with the correct number of characters for the AP name that the user has stored from the webpage.?

Any help is greatly appreciated.

thanksThanks.

Char* and string conversion from an esp8266 webserver

I have the following arduino code for configuring wifi connection through a simple webpage:

I declare:

char* ssid;

Later I read a value from SPIFFS config file where q_ssid if declared as a string and successfully populated from the file:

strncpy(ssid, q_ssid.c_str(), 10 );

In the line above, I am limiting it to exactly 10 as that is the length of my wifi AP name that this connects to.If I change the initial char* to:

char ssid[10];

then all works well, but SSIDs can have varying names, and if I do not use 10 chars, then the trailing spaces prevent connection in the statement:

WiFi.begin(ssid, password);

On the webclient handler that reads in values from the user, I use this:

String q_ssid = server.arg("ssid");
strncpy(ssid, q_ssid.c_str(), 10 );

My question here is how can I dynamically assign the size of: char* ssid; So that it can be used with the correct number of characters for the AP name that the user has stored from the webpage.

Any help greatly appreciated.

thanks

Char* and string conversion from an ESP8266 web server

I have the following Arduino code for configuring a wifi connection through a simple webpage:

I declare char* ssid;. Later I read a value from a SPIFFS config file where q_ssid is declared as a string and successfully populated from the file:

strncpy(ssid, q_ssid.c_str(), 10);

In the line above, I am limiting it to exactly 10 as that is the length of my wifi AP name that this connects to. If I change the initial char* to char ssid[10];, all works well, but SSIDs can have varying names, and if I do not use 10 chars, then the trailing spaces prevent connection in the statement WiFi.begin(ssid, password);.

On the web client handler that reads in values from the user, I use this:

String q_ssid = server.arg("ssid");
strncpy(ssid, q_ssid.c_str(), 10 );

How can I dynamically assign the size of char* ssid; so that it can be used with the correct number of characters for the AP name that the user has stored from the webpage?

Any help is greatly appreciated.

Thanks.

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asked Jan 9, 2018 at 19:15

Tim Spanoudakis

Char* and string conversion from an esp8266 webserver

I have the following arduino code for configuring wifi connection through a simple webpage:

I declare:

char* ssid;

Later I read a value from SPIFFS config file where q_ssid if declared as a string and successfully populated from the file:

strncpy(ssid, q_ssid.c_str(), 10 );

In the line above, I am limiting it to exactly 10 as that is the length of my wifi AP name that this connects to.If I change the initial char* to:

char ssid[10];

then all works well, but SSIDs can have varying names, and if I do not use 10 chars, then the trailing spaces prevent connection in the statement:

WiFi.begin(ssid, password);

On the webclient handler that reads in values from the user, I use this:

String q_ssid = server.arg("ssid");
strncpy(ssid, q_ssid.c_str(), 10 );

My question here is how can I dynamically assign the size of: char* ssid; So that it can be used with the correct number of characters for the AP name that the user has stored from the webpage.

Any help greatly appreciated.

thanks

esp8266 c-string