MFC writing double data type to registry

Question

I'm working on an application that needs to store a data value of type double to the registry. I'm using MFC but the only functions in "theApp" that I see for doing the job (from the searching that I've done) are GetProfileIntW , GetProfileStringW and GetProfileBinary . What would be the best way to store and retrieve the data while keeping as much precision as possible?

Answer 1

The GetProfileBinary function is the only reasonable choice. Using a string would mean doing conversions and using an int would lose precision in many cases.

double *pMyDouble;
UINT size = sizeof(*pMyDouble);
GetProfileBinary(sectionName, valueName, (LPBYTE *)&pMyDouble, &size);
double myDouble = *pMyDouble;