Array to pointer to pointer

[frier]

Hi Guys,

Sitting with a problem.

I have a function, which demands a pointer to some data.

gputsym(x,0,(PGSYMBOL) &icon15);

icon15 is the pointer to the dataarea

When I write the pointername, I use in the dataarea, it works allright.

But the pointername should be substituted with a name entered in an array, but now it is going wrong.

I tried to declare my array like this

char mgtext[10][30], mgicon[10][6];

Actually the array mgicon should be an array[10] of strings but....
so instead, I manually read in from the file, each character at a time, and then add it to the mgicon[2][0] ... mgicon[2][6] (i,c,o,n,1,5,\0)

Now, mgicon[2] for example should contain 'icon15'

so the above code should be

gputsym(x,0,(PGSYMBOL) mgicon[2]);

This doesn't work, looked everywhere, can not find a solutions to this problem, hope somebody can give me a hint.

Best regards
Frier

[DJMaze]

(i,c,o,n,1,5,\0) = 7 characters not 6

So gputsym(x,0,(PGSYMBOL) mgicon[2]) recieves "icon15" without the '\0'

[frier]

I've already did this , the variable contains the correct data, the problem is for gputsym to recognize the content of mgicon[] as a pointer.

Any suggestion?

[DJMaze]

function gputsym(int x, int O, char *icon)

I think you should read your Dot Matrix LCD module Driver Library though (or isn't it for the lcd lib ?)

[frier]

Yes, the function is for Ramtex library for graphical LCD.

I Have read the manual, and it state that it has to be a pointer to the data-area.

So the problem is to have the name of the pointer to the data-area in an array.

/Frier

[DJMaze]

gputsym(x,0,(PGSYMBOL) mgicon[2])

what is PGSYMBOL for definition ?
In the above you say it's a char[6]

The info you gave is to limited for people who don't know what it is.

[frier]

DJ!

I dont think what PGSYMBOL is matters in this case, the core of my question is:

How do I substitue a pointername with a name (equal to the pointer) in a variable (array), and get my function to treat the name as a pointer?

Maybe it is of importance, my c-skills is very limited at least when it comes to pointers. I have been programming all other languages for the last 20 years asm, pascal, vb etc. and this pointer-thing c/c++ is doing, is rather confusing and very opposite to e.g. pascal.

/Frier

[redhead]

could this be of any interest ?
Or am i wrong here assuming you want pointers to functions in an array..
If you want to do the equivalent of something like:

Array $my_variables = { "item1", "item2", "item3"};
foreach ($item in $my_variables)
      exec($item);

Not specific any language here, but I think you'd get my guess, as to you're using strings to represent the variable names and uppon execution you want to access the variable values instead of the strings representing them..

It can't be done the way you are trying in C/C++

[DJMaze]

Originally Posted by frier

How do I substitue a pointername with a name (equal to the pointer) in a variable (array), and get my function to treat the name as a pointer?

How do you write it in perl ?
"unsigned char *cpointer" is like "Pchar ppointer" in delphi/pascal
and pointer[0] equal to ppointer^

Because my english is limited so your text looks like the following to me:

PHP Code:

//void * is similar to Pointer in delphi/pascal
PGSYMBOL icon2;
void **array;
array = (void**) malloc(10, sizeof(void*));
array[2] = (void*)icon2;
gputsym(x,0,(PGSYMBOL) array[2]);
free(array); 


But in my opinion it's better to have atleast some sort of struct so you may add/delete as many items as you want