/* static */
int wxApp::GetShell32Version()
{
static int s_verShell32 = -1;
if ( s_verShell32 == -1 )
{
// we're prepared to handle the errors
wxLogNull noLog;
wxDynamicLibrary dllShell32(wxT("shell32.dll"), wxDL_VERBATIM);
if ( dllShell32.IsLoaded() )
{
s_verShell32 = CallDllGetVersion(dllShell32);
if ( !s_verShell32 )
{
// there doesn't seem to be any way to distinguish between 4.00
// and 4.70 (starting from 4.71 we have DllGetVersion()) so
// just assume it is 4.0
s_verShell32 = 400;
}
}
else // failed load the DLL?
{
s_verShell32 = 0;
}
}
return s_verShell32;
}
/* static */
int wxApp::GetComCtl32Version()
{
// cache the result
//
// NB: this is MT-ok as in the worst case we'd compute s_verComCtl32 twice,
// but as its value should be the same both times it doesn't matter
static int s_verComCtl32 = -1;
if ( s_verComCtl32 == -1 )
{
// we're prepared to handle the errors
wxLogNull noLog;
// we don't want to load comctl32.dll, it should be already loaded but,
// depending on the OS version and the presence of the manifest, it can
// be either v5 or v6 and instead of trying to guess it just get the
// handle of the already loaded version
wxLoadedDLL dllComCtl32(wxT("comctl32.dll"));
if ( !dllComCtl32.IsLoaded() )
{
s_verComCtl32 = 0;
return 0;
}
// try DllGetVersion() for recent DLLs
s_verComCtl32 = CallDllGetVersion(dllComCtl32);
// if DllGetVersion() is unavailable either during compile or
// run-time, try to guess the version otherwise
if ( !s_verComCtl32 )
{
// InitCommonControlsEx is unique to 4.70 and later
void *pfn = dllComCtl32.GetSymbol(wxT("InitCommonControlsEx"));
if ( !pfn )
{
// not found, must be 4.00
s_verComCtl32 = 400;
}
else // 4.70+
{
// many symbols appeared in comctl32 4.71, could use any of
// them except may be DllInstall()
pfn = dllComCtl32.GetSymbol(wxT("InitializeFlatSB"));
if ( !pfn )
{
// not found, must be 4.70
s_verComCtl32 = 470;
}
else
{
// found, must be 4.71 or later
s_verComCtl32 = 471;
}
}
}
}
return s_verComCtl32;
}
