Convert string to float ?
- Thread starter shihchiy
- Start date
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No -- that'd only work if the string was an actual decimal character representation of the number (e.g. "3.14"). As I understand it, the string contains a binary representation of a floating-point number (e.g. the byte values 0xC3 0xF5 0x48 0x40).Angel_Mapper said:
shihchiy: If my assumption is right, you'll probably have to use the Asc(...) function to get the individual byte values of that string and construct the resulting float number yourself. There's no built-in function for that conversion.
the question is, how to encode a float into 4 bytes, what float format are you using.
with Asc() you can convert an ASCII char to it's integer representation, using that you can convert the four chars to 4 bytes. After that you only have to convert the 4 bytes to a float, this depends on your float format.
with Asc() you can convert an ASCII char to it's integer representation, using that you can convert the four chars to 4 bytes. After that you only have to convert the 4 bytes to a float, this depends on your float format.
The pseudo code in c++ to store a float into a string is as below
float f;
char buf[20];
memcpy((void *)buf, &f,sizeof(f));
buf is sent to Unrealscript through TcpLink.
Any idea about how to convert buf back to float in Unrealscript program ?
Best
Luke
float f;
char buf[20];
memcpy((void *)buf, &f,sizeof(f));
buf is sent to Unrealscript through TcpLink.
Any idea about how to convert buf back to float in Unrealscript program ?
Best
Luke
Mychaeel said:
Well... understand how the IEEE float format works (see link) and convert the bytes to a float yourself. You can get the bytes using the Asc() function.
I'm afraid I can't think of any better way to do it, other than changing the protocol you're using -- you might want to transfer that numerical value in decimal form (13.37 as "1" "3" "." "3" "7") or use a fixed-point number (13.37 as 13.37 << 16 == 876216 which translates back to 13.3699951...).
I'm afraid I can't think of any better way to do it, other than changing the protocol you're using -- you might want to transfer that numerical value in decimal form (13.37 as "1" "3" "." "3" "7") or use a fixed-point number (13.37 as 13.37 << 16 == 876216 which translates back to 13.3699951...).