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Arduino Forum Help Arduino IDE stupidness.
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  • Replies 8 replies
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  • c
  • arduino IDE 1.8.13
Related

Help Arduino IDE stupidness.

phoenixcomm
phoenixcomm over 2 years ago

Today's problem is that I am working with "CANNED" messages so in C I use an array or structures like this: 

struct messages{
int display;
char* message[9];
};
typedef struct messages Messages[] = {
{1, "BITE TST"}, { 2, "NO LNIK"}, {2, "NO ERROR"},
{1, "AVIONICS"}, { 2, "COMM OK"}, {2, "ER-"},
{2, "LB-"}, {2, "GL-"}
};

but the IDE error: typedef ‘Messages’ is initialized (use decltype instead)  WTF!!!!????

I have also re-written this as:

typedef struct {
int display;
char* message[9];
}Messages [] = {

{1, "BITE TST"}, { 2, "NO LNIK"}, {2, "NO ERROR"},
{1, "AVIONICS"}, { 2, "COMM OK"}, {2, "ER-"},
{2, "LB-"}, {2, "GL-"}
};

OK, I give up! Please can anybody quickly tell me what the heck is going on??

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  • javagoza
    javagoza over 2 years ago +7
    typedef defines an alias, try: typedef struct messages{ int display; char* message[9]; } messages; messages Messages[] = { {1, "BITE TST"}, { 2, "NO LNIK"}, {2, "NO ERROR"}, {1, "AVIONICS"}, { 2, "COMM…
  • Jan Cumps
    Jan Cumps over 2 years ago +3
    You can't assign values to a typedef. Declare a variable of that typedef, and assign values to it.
  • baldengineer
    baldengineer over 2 years ago +3
    If you're using the Arduino library, you might want to use its String object instead of C-char arrays. https://www.arduino.cc/reference/en/language/variables/data-types/stringobject/ You have to be…
Parents
  • baldengineer
    baldengineer over 2 years ago

    If you're using the Arduino library, you might want to use its String object instead of C-char arrays.

    https://www.arduino.cc/reference/en/language/variables/data-types/stringobject/

    You have to be careful on the 8-bit platforms with only a couple of kilobytes of RAM when using String. It is easy to smash the stack. But that's the case no matter what you do on them. Slight smile On the 32-bit boards with a couple of hundred K RAM, I find the ease of treating strings as Strings worthwhile.

    (Please note, an Arduino library String object is not the same as a C++ string... The capitalization matters in this case.)

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  • javagoza
    javagoza over 2 years ago in reply to baldengineer

    You can move the Strings to Flash memory  using the F() wrapper, wrapping the String.

    Serial.println(F("Something"));

    https://docs.arduino.cc/learn/programming/memory-guide#string-wrapper

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  • javagoza
    javagoza over 2 years ago in reply to baldengineer

    You can move the Strings to Flash memory  using the F() wrapper, wrapping the String.

    Serial.println(F("Something"));

    https://docs.arduino.cc/learn/programming/memory-guide#string-wrapper

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  • baldengineer
    baldengineer over 2 years ago in reply to javagoza

    Yes, but handling them is still done in RAM. Which, the String object makes much easier than dealing with c-char arrays.

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