RGB to HEX routines

Does any one have any routines for taking RGB values and turning them into HEX that they would like to "make public"?

[parksie]

They're already hex:

0x00BBGGRR (on Intel, anyway...I think)

So:

unsigned short usRed;
unsigned short usGreen;
unsigned short usBlue;
unsigned long ulColour = 0xaabbcc;

usRed = ulColour;
usGreen = ulColour >> 8;
usBlue = ulColour >> 16;

I dont think thats HEX, but if it is, thats not the kind im talking about. Im talking about the kind used for color values in HTML.

[parksie]

Oops...silly me. I thought you wanted to split the numbers up

In that case, how about this to convert it to a hex string:

unsigned long lColour = 0xccbbaa;
char *pcHexStr = "#000000";
char cTemp;

for(int i = 0; i < 6; i++) {
	cTemp = (lColour >> (i*4)) & 0x0f;
	pcHexStr[i+1] = cTemp + ((cTemp > 9) ? ('a' - 0xa) : '0');
}

cout << pcHexStr << endl

I cant seem to get it to work. Every time it comes to that code, windows says the app has crashed.

[parksie]

I don't know what it is, then, since it worked perfectly on mine. Did you copy the code directly, or have you changed it at all? Remember - the buffer must be at least 7 characters long.