Email with attachments for all

[froussel]

Hello, I got the example
Send_Attachment_File.ino
which works very well
But I want to be able to use it with any sender address in Gmail, any recipient address, and attached files stored in spiffs or SD. This information will be chosen in a web page that the ESP32 will propose to inform by the user.
How in the example to modify so that the example becomes a function with variables of the kind:
void thing to do (author_mail, recept_mail, ...)
Knowing that these will be like "course1.gpx", "course2.gpx, etc.

Currently I have modified the example in

byte nb = 2;
String filename;
 byte loop = 0;
  
  SMTP_Attachment att [nb];
  while (loop <nb) {
        Serial.println (loop);
        String filename = String ("path" + String (loop) + ".gpx");
        char __dataFileName [sizeof (filename)];
        filename.toCharArray (__ dataFileName, sizeof (__ dataFileName));
        att [loop] .descr.filename = F (__ dataFileName);
        att [loop] .descr.mime = F ("application / octet-stream");
        filename = String ("/" + filename);
        __dataFileName [sizeof (filename)];
        filename.toCharArray (__ dataFileName, sizeof (__ dataFileName));
        att [loop] .file.path = F (__ dataFileName);
        att [loop] .file.storage_type = esp_mail_file_storage_type_flash;
        message.addAttachment (att [loop]);
        loop ++;}

I don't find it very nice but it works :-(
But I don't know how to replace

session.login.email = AUTHOR_EMAIL;
 session.login.password = AUTHOR_PASSWORD;
 message.sender.name = F ("MyTracker");
 message.subject = F ("Test Flash");
 message.addRecipient (F ("zzz"), F ("xxxxx @ yyyy"));

by variables nor of what types they must be

thanks in advance

[mobizt]

You can assign all config properties and all input parameters of functions in this library that accepted string with Arduino String, std::string, const char*, chars array, string literal, flash string pointer (F and FPSTR).

In the examples, it use F() macro to show that the library support F() string for input too.

Examples:

String mail1 = "john1@smith.com";
std::string mail2= "john2@smith.com";
const char *mail3 = "john2@smith.com";

session.login.email = "john@smith.com";
session.login.email = F("john@smith.com");
session.login.email = FPSTR("john@smith.com");
session.login.email = mail1;
session.login.email = mail2;
session.login.email = mail3;

String recp_name= "steve";
String recp_email= "steve@jobs.com";

message.addRecipient (recp_name, recp_email);

//For string concatenation
String recp_name2 =  "peter";
String recp_email2 = recp_name2+ "@smith.com";

message.addRecipient (recp_name2 , recp_email2);

AUTHOR_EMAIL is your (sender) email address.

[froussel]

Ok I understand better but if

String truc1= "parcours";
byte nb=12;
String total= truc1 + String(nb);           // right ?

With char...

char *truc1= "parcours";
byte nb=12;
char *total = ??????

[froussel]

message.addHeader("Message-ID:  <" +dest_email +">");           // bad !

message.addHeader(F("Message-ID:  <" +dest_email +">"));        // bad !

How to do ?
Ok I understand better for the use of F()
The notions of concatenations of String, char foo [] and char * are still uncertain in my head!

String is a string we can concatenate

String foo1 = "Hello";
String foo2 = "world";
String foo3 = foo1 + "" + foo2;              // true?




char * foo1 = "Hello";
char * foo2 = "world";
char * foo3 = foo1 + "" + foo2;         //how to make ?

[mobizt]

Everything is not what as you think.

F() is the macro that defined in Arduino String class (WString.h) that accepted the string literal only to stored on the flash space.

Then you can't use it like this
F("Message-ID: <" +dest_email +">")

This is the String and string literal that concatenated by the helping of StringSumHelper class defined in WString.h
message.addHeader("Message-ID: <" +dest_email +">")

Which the library is currently not supported this StringSumHelper class object as input.

I will add support this StringSumHelper in the next update.

If you have this basic question about String implementations, please visit Arduino website.

[froussel]

Which the library is currently not supported this StringSumHelper class object as input.
I will add support this StringSumHelper in the next update.

Thanks

[mobizt]

If you don't have experiences to use char array in C/C++, please avoid it as this may lead to memory leaks and unexpected result when you allocate and don't deallocate it properly.

Please use Arduino's String class or basic string (std::string) instead.

[mobizt]

This is invalid for converting a string constant to char array
char * foo1 = "Hello";

This is valid
const char * foo1 = "Hello";

You can learn the basic char array usage
https://stackoverflow.com/questions/18688971/c-char-array-initialization

But as I mentioned above this may lead to memory leaks and device crashed as you don't manage it properly.

[froussel]

Thank you