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Jhonatan
Joined: 18 Mar 2019
Posts: 6
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| Help on handling const string tables by pointer or similar |
 Posted: Fri Apr 12, 2019 11:31 am |
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So the purpose is handle multi-language support with run time selection in a not "full of ifs" way.
I kind of got to a solution that would not be so ugly, which involves storing the translated texts in tables and point access them, but there will be too much RAM involved.
I can't find a solution to make it work with constant tables as I can't point them (or at least I'm missing something).
The code below does not work but I think it shows the objective very clearly.
I apreciate if someone could put a work around to make these pointers work or something similar to address the correct table.
I did not try CONST=READ_ONLY for the same reason of the RAM usage.
Compiled in CCS v5.076 and tested in MPLAB v8.092
| Code: | #include <18F26K22.h>
#device ADC = 10
#FUSES NOWDT, PUT
#use delay(internal = 64000000)
#use RS232(UART1, ERRORS, baud = 9600, stream = PORT1)
enum {
STR_HELLO,
STR_USER
};
const char en_us[][*] = {
"HELLO",
"USER"
};
const char pt_br[][*] = {
"OLA",
"USUARIO"
};
int8 *language;
void main() {
printf("1: %s %s\r\n", en_us[STR_HELLO], en_us[STR_USER]); // Works
printf("2: %s %s\r\n", pt_br[STR_HELLO], pt_br[STR_USER]); // Works
// The purpose is to do this or something similar, for run time language selection
language = &en_us;
printf("3: %s %s\r\n", language[STR_HELLO], language[STR_USER]);
while (TRUE);
} |
Output:
| Quote: | 1: HELLO USER
2: OLA USUARIO
3:
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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Jhonatan
Joined: 18 Mar 2019
Posts: 6
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| Posted: Mon Apr 15, 2019 1:24 pm |
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Thanks PCM programmer, it worked. Perhaps I could have searched more.
Code below outputs this, which is correct, when compiled in v5.076.
| Quote: | 1: HELLO USER
2: OLA USUARIO
3: HELLO USER
4: OLA USUARIO
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| Code: | #include <18F26K22.h>
#device ADC = 10
#FUSES NOWDT, PUT
#use delay(internal = 64000000)
#use RS232(UART1, ERRORS, baud = 9600, stream = PORT1)
enum {
STR_HELLO,
STR_USER
};
rom char *en_us[][] = {
"HELLO",
"USER"
};
rom char *pt_br[][] = {
"OLA",
"USUARIO"
};
rom char **language[2] = {&en_us, &pt_br};
void main() {
int8 set = 0;
printf("1: %s %s\r\n", en_us[STR_HELLO], en_us[STR_USER]);
printf("2: %s %s\r\n", pt_br[STR_HELLO], pt_br[STR_USER]);
set = 0;
printf("3: %s %s\r\n", language[set][STR_HELLO], language[set][STR_USER]);
set = 1;
printf("4: %s %s\r\n", language[set][STR_HELLO], language[set][STR_USER]);
while (TRUE);
} |
I also tested in v5.025 and got unexpected output:
| Quote: |
1: HELLO USER
2: OLA USUARIO
3: 9o 9o
4: 9o
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 15, 2019 1:30 pm |
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| Jhonatan wrote: |
I also tested in v5.025 and got unexpected output:
1: HELLO USER
2: OLA USUARIO
3: 9o 9o
4: 9o
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CCS did some bug fixes after that version:
5.037 Optimization bugs dealing with some ROM pointers and clear_interrupts(INT_RB) are fixed.
5.033 Some pointers to ROM bugs have been fixed on the 14 bit parts. |
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