Good Day Everyone,
Once again I am having a problem, other that trying to wake up on a Monday. I am trying to set a char[] = a substring. I keep getting a "cannot convert error". I get those quit often. Any suggestions on how I can learn to avoid this problem. More specifically, how can I correct this problem now?????
Thanks,
Kendal
"I am trying to set a char[] = a substring."
Whatever that means.
You need to allocate some space there.
I assume you are doing like:
char a[] = something that returns a char *;
a char[] is not a char*
I not sure but this may work.
strcpy(char,"substring");
if i understand the question correctly
This is actually done in a class. I am actually reading a line at a time from a file into a string. I then want to pull fields from the string and store them into class members. Big Picture==Converting a 9 mb text file of patient records into a format that can be read into a MYSQL table. The text file has to be edited. Anyway, here is one of the lines of code:
lname = readline->substr(8,19);
lname is declared as "char lname[20]"
readline is the string that holds the line from the file
Any Ideas????
Thanks,
Kendal
lname[0] = my_string[0]
etc.
Doesn't that only copy 1 character at a time????
I just want to load the string returned by substr into a character array.
you cannot do something like that. lname stores the address of 20 bytes of memory allocated for the array. the statement "name = readline->substr(8, 19);" attempts to change the address of lname to the value returned by substr().Originally posted by gvector1
lname = readline->substr(8,19);
lname is declared as "char lname[20]"
readline is the string that holds the line from the file
what you want to do is copy the string into the lname buffer:
Code:std::string sub = readline->substr(8, 19); strncpy(lname, sub.c_str(), sub.size()); lname[sub.size()] = NULL;
