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don't give errors if SetLayeredWindowAttributes() is not available (as is the case under Win95)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55893 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2008-09-25 21:41:47 +00:00
parent e25cd7750c
commit caf587aaeb
1 changed files with 12 additions and 4 deletions
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16
src/msw/toplevel.cpp
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@ -1131,15 +1131,23 @@ bool wxTopLevelWindowMSW::SetTransparent(wxByte alpha)
{
#if wxUSE_DYNLIB_CLASS
typedef DWORD (WINAPI *PSETLAYEREDWINDOWATTR)(HWND, DWORD, BYTE, DWORD);
static PSETLAYEREDWINDOWATTR pSetLayeredWindowAttributes = NULL;
static PSETLAYEREDWINDOWATTR
pSetLayeredWindowAttributes = (PSETLAYEREDWINDOWATTR)-1;
if ( pSetLayeredWindowAttributes == NULL )
if ( pSetLayeredWindowAttributes == (PSETLAYEREDWINDOWATTR)-1 )
{
wxDynamicLibrary dllUser32(_T("user32.dll"));
// use RawGetSymbol() and not GetSymbol() to avoid error messages under
// Windows 95: there is nothing the user can do about this anyhow
pSetLayeredWindowAttributes = (PSETLAYEREDWINDOWATTR)
dllUser32.GetSymbol(wxT("SetLayeredWindowAttributes"));
dllUser32.RawGetSymbol(wxT("SetLayeredWindowAttributes"));
// it's ok to destroy dllUser32 here, we link statically to user32.dll
// anyhow so it won't be unloaded
}
if ( pSetLayeredWindowAttributes == NULL )
if ( !pSetLayeredWindowAttributes )
return false;
#endif // wxUSE_DYNLIB_CLASS