Buffer data size

[_Flaviu]

Hi all. I have a doubt: how ulSize data buffer size should be:

CString sValue;
ULONG ulSize = \_MAX\_PATH;
lRet = RegQueryValueEx(hKey, NULL, NULL, NULL, (BYTE\*)sValue.GetBuffer(\_MAX\_PATH), &ulSize);
sValue.ReleaseBuffer();

or

CString sValue;
ULONG ulSize = \_MAX\_PATH \* sizeof(TCHAR);
lRet = RegQueryValueEx(hKey, NULL, NULL, NULL, (BYTE\*)sValue.GetBuffer(\_MAX\_PATH), &ulSize);
sValue.ReleaseBuffer();

I guess that ulSize should be _MAX_PATH * sizeof(TCHAR); like in the second code ... but I am not sure ... can you tell me how is right ? Thank you.

[Jochen Arndt]

From MSDN RegQueryValueEx function[^]:

Quote:

lpcbData [in, out, optional] A pointer to a variable that specifies the size of the buffer pointed to by the lpData parameter, in bytes.

So it must be the second version.

[Lost User]

Version 1, as CString adjusts itself to the character type in use. See https://msdn.microsoft.com/en-us/library/aa314880%28v=vs.60%29.aspx[^]. A simple test wolud confirm it for you.

[_Flaviu]

Thank you !