This is the mail archive of the cygwin-apps mailing list for the Cygwin project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: w32api question

On Jul 20 11:51, Chris Sutcliffe wrote:
> On 20 July 2010 10:32, Corinna Vinschen wrote:
> > Can you please explain this a bit more? ÂWhat exactly are these
> > applications doing? ÂI'm asking because one way to extract the constants
> > via an application is "grep" in the VC++ include directory. ÂHow are the
> > apps in question extracting constants?
> One example is the following code employed by a user to determine the
> value IID_IActiveDesktop:
> #include <windows.h>
> #include <shlguid.h>
> #include <stdio.h>
> #include <string.h>
> void print_guid(const char *name, const GUID *guid)
> {
> 	int mem[4]; /* Assume sizeof(int) == 4 */
> 	int i;
> 	memcpy(mem, guid, sizeof(mem));
> 	printf("%s: 0x", name);
> 	for (i = 0; i < 4; i++)
> 		printf("%X", mem[i]);
> 	printf("\n");
> }
> int main(void) {
> 	GUID template = IID_IShellView2;
> 	GUID cls = CLSID_ActiveDesktop;
> 	GUID iid = IID_IActiveDesktop;
> 	print_guid("template", &template);
> 	print_guid("cls", &cls);
> 	print_guid("iid", &iid);
> 	return 0;
> }
> This code was compiled VC++ and run to extract IID_IActiveDesktop.
> From what the OP stated, he never looked at the header files, just
> used this 'blackbox' approach.

Hmm, that looks... interesting.  No worries for the CLSID value which
can easily be extracted from the registry (HKEY_CLASSES_ROOT\CLSID),
but otherwise...

> > FYI, I already asked for legal advice about the situation with Mingw64,
> > which is different, but might give some important insight. ÂkIf you give
> > me some hints about these apps, I'll forward your request as well. ÂThe
> > reply might take some time, though.
> No worries, I would very much appreciate the legal advice around this
> and will gladly hold off doing anything with the patch until I've
> heard back.

Ok, I'll forward this problem.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]