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27 
28 #ifdef _MSC_VER
29 #pragma warning(push, 1) /* disable warnings within system headers */
30 #endif
31 #define WIN32_LEAN_AND_MEAN
32 #include <windows.h>
33 #include <msiquery.h>
34 #ifdef _MSC_VER
35 #pragma warning(pop)
36 #endif
37 
38 #include <stdlib.h>
39 
40 extern "C" UINT __stdcall RebuildShellIconCache(MSIHANDLE)
41 {
42 	// Rebuild icon cache on windows OS prior XP
43 
44 	OSVERSIONINFO	osverinfo;
45 
46 	osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
47 
48 	if (
49 		GetVersionEx( &osverinfo ) &&
50 		VER_PLATFORM_WIN32_NT == osverinfo.dwPlatformId &&
51 		(
52 		5 < osverinfo.dwMajorVersion ||
53 		5 == osverinfo.dwMajorVersion && 0 < osverinfo.dwMinorVersion
54 		)
55 		)
56 	{
57 		return ERROR_SUCCESS;
58 	}
59 
60 	HKEY	hKey;
61 	DWORD	dwDispostion;
62 	LONG	lError = RegCreateKeyEx( HKEY_CURRENT_USER, TEXT("Control Panel\\Desktop\\WindowMetrics"), 0, NULL, REG_OPTION_VOLATILE, KEY_SET_VALUE | KEY_QUERY_VALUE, NULL, &hKey, &dwDispostion );
63 
64 	if ( ERROR_SUCCESS == lError )
65 	{
66 		TCHAR	szValue[256];
67 		TCHAR	szTempValue[256];
68 		DWORD	cbValue = sizeof(szValue);
69 		DWORD	dwType;
70 		int		iSize = 0;
71 
72 		lError = RegQueryValueEx( hKey, TEXT("Shell Icon Size"), 0, &dwType, (LPBYTE)szValue, &cbValue );
73 
74 		if ( ERROR_SUCCESS == lError )
75 			iSize = atoi( szValue );
76 
77 		if ( !iSize )
78 		{
79 			iSize = GetSystemMetrics( SM_CXICON );
80 			itoa( iSize, szValue, 10 );
81 			cbValue = strlen( szValue ) + 1;
82 			dwType = REG_SZ;
83 		}
84 
85 		itoa( iSize + 1, szTempValue, 10 );
86 		lError = RegSetValueEx( hKey, TEXT("Shell Icon Size"), 0, dwType, (LPBYTE)szTempValue, strlen( szTempValue ) + 1 );
87 
88 		LRESULT	lResult = SendMessageTimeout(
89 			 HWND_BROADCAST,
90 			 WM_SETTINGCHANGE,
91 			 SPI_SETNONCLIENTMETRICS,
92 			 (LPARAM)TEXT("WindowMetrics"),
93 			 SMTO_NORMAL|SMTO_ABORTIFHUNG,
94 			 0, NULL);
95 
96 		lError = RegSetValueEx( hKey, TEXT("Shell Icon Size"), 0, dwType, (LPBYTE)szValue, cbValue );
97 
98 		lResult = SendMessageTimeout(
99 			 HWND_BROADCAST,
100 			 WM_SETTINGCHANGE,
101 			 SPI_SETNONCLIENTMETRICS,
102 			 (LPARAM)TEXT("WindowMetrics"),
103 			 SMTO_NORMAL|SMTO_ABORTIFHUNG,
104 			 0, NULL);
105 
106 		lError = RegCloseKey( hKey );
107 	}
108 
109     return ERROR_SUCCESS;
110 }
111