WinINet: function HttpOpenRequest parameter lplpszAcceptTypes
lazarus / 34-Windows

----------------------------------------------------------------------
Lagavulin16 · 2012-12-04 11:23

One parameter of the function HttpOpenRequest is lplpszAcceptTypes
(see wininet.pp). According to MSDN this parameter is a pointer to a
null-terminated array of strings that indicates media types accepted
by the client.

How do I have to set this parameter in Lazarus if the client only
accepts JPGs?

'jpg/*' or PChar('jpg/*') will be refused by the compiler because it's
not LPPCSTR, off course. LPPCSTR(PChar('jpg/*')) will be compiled, but
will raise an exception when executed.

----------------------------------------------------------------------
marcov · 2012-12-06 22:44

A null terminated array of strings (which are in them selves also nul
terminated) means that a two item list is a pointer to something that
looks like

str1 #0
str2 #0
#0

Note that it effectively ends in two #0s.

In summary, try LPPCSTR(PChar('jpg/*'#0#0))

in theory one #0 should do also, but just in case.