std::search matches start of data before passing to function, but not within function?

[Mike the Red]

#ifndef BYTE // For OS X -ers
#define unsigned char BYTE
#define unsigned char * LPBYTE
#endif
#include <vector>
#include <algorithm>
void separate(vector< pair<LPBYTE, LPBYTE> >& retVec, LPBYTE data, LPBYTE delimeter, /* out */bool *bComplete = 0) {
retVec.clear();
if (bComplete) *bComplete = false;

if (!data)	// No data - leave retVec empty
	return;

LPBYTE dataEnd = data + sizeof(data);
LPBYTE delEnd = delimeter + sizeof(delimeter);
size\_t delSize = distance(delimeter, delEnd);

LPBYTE found = std::search(data, dataEnd, delimeter, delEnd);

if (found == delEnd)	// Delimeter not in data - leave retVec empty
	return;

cout << "In separate(...)\\n";
if (data\[0\] == delimeter\[0\])
	cout << "data\[0\] == delimeter\[0\]\\n";

if (found == data)
	cout << "Found == data.\\n(" << found\[0\] << " == " << data\[0\] << ")\\n";

if (found != data)  			// Found delimeter ends first split
	cout << "Found != data; found == data\[" << distance(data, found) << "\].\\n";
return;

};
int main()
{
BYTE buffer[] = {',', '1', '2', '3', ',', '4', '5', '6', ',', '7', '8', '9', ',', 0};
BYTE del = ',';
bool bComp = true;

LPBYTE found = std::search(&buffer\[0\], &buffer\[0\] + sizeof(buffer), &del, &del + sizeof(del));
if (found == &buffer\[0\])
	cout << "found == &buffer\[0\]\\n";
else
	cout << "found == &buffer\[" << distance(&buffer\[0\], found) << "\]\\n";

vector< pair<LPBYTE, LPBYTE> > lpb;
separate(lpb, buffer, &del, &bComp);

return 0;

}

Output:

found == &buffer[0]
In separate(...)
data[0] == delimeter[0]
Found != data; Found == data[4]

When I search from within main(), the leading comma is found, but once I pass the data & delimeter to separate(), it misses the leading comma and finds the next one.. obviously I'm missing something - can anyone spot what it is? Your assistance is greatly appreciated! MZR

[Mike the Red]

In main(), del is of type BYTE and sizeof(del) is 1. Once it's passed to separate, del is of type LPBYTE and sizeof(del) is 4.