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cache the result of wxGetOsVersion() (heavily modified patch 1783198)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48621 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2007-09-09 22:40:14 +00:00
parent 1d9473d33b
commit 5bc3ef05b8
1 changed files with 52 additions and 20 deletions
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56
src/msw/utils.cpp
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@ -1198,33 +1198,65 @@ bool wxIsPlatform64Bit()
}
wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)
{
static struct
{
// this may be false, true or -1 if we tried to initialize but failed
int initialized;
wxOperatingSystemId os;
int verMaj,
verMin;
} s_version;
// query the OS info only once as it's not supposed to change
if ( !s_version.initialized )
{
OSVERSIONINFO info;
wxZeroMemory(info);
info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
info.dwOSVersionInfoSize = sizeof(info);
if ( ::GetVersionEx(&info) )
{
if (verMaj) *verMaj = info.dwMajorVersion;
if (verMin) *verMin = info.dwMinorVersion;
}
s_version.initialized = true;
#if defined(__WXWINCE__)
return wxOS_WINDOWS_CE;
s_version.os = wxOS_WINDOWS_CE;
#elif defined(__WXMICROWIN__)
return wxOS_WINDOWS_MICRO;
#else
s_version.os = wxOS_WINDOWS_MICRO;
#else // "normal" desktop Windows system, use run-time detection
switch ( info.dwPlatformId )
{
case VER_PLATFORM_WIN32_NT:
return wxOS_WINDOWS_NT;
s_version.os = wxOS_WINDOWS_NT;
break;
case VER_PLATFORM_WIN32_WINDOWS:
return wxOS_WINDOWS_9X;
s_version.os = wxOS_WINDOWS_9X;
break;
}
#endif // Windows versions
s_version.verMaj = info.dwMajorVersion;
s_version.verMin = info.dwMinorVersion;
}
else // GetVersionEx() failed
{
s_version.initialized = -1;
}
}
return wxOS_UNKNOWN;
#endif
if ( s_version.initialized == 1 )
{
if ( verMaj )
*verMaj = s_version.verMaj;
if ( verMin )
*verMin = s_version.verMin;
}
// this works even if we were not initialized successfully as the initial
// values of this field is 0 which is wxOS_UNKNOWN and exactly what we need
return s_version.os;
}
wxWinVersion wxGetWinVersion()