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62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/*
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* Return FALSE if no default mail client is installed.
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*/
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static BOOL HaveDefaultMailClient(void)
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{
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HKEY Key;
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DWORD Type, Size;
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BYTE Buffer[64];
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BOOL HasHKCUKey;
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/* We check the default value of both HKCU\Software\Clients\Mail and
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* HKLM\Software\Clients\Mail, if one of them is present there is a default
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* mail client. If neither of these keys is present, we might be running
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* on an old Windows version (W95, NT4) and we assume a default mail client
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* might be available. Only if one of the keys is present, but there is
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* no default value do we assume there is no default client. */
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if (RegOpenKeyExA(HKEY_CURRENT_USER, "SOFTWARE\\Clients\\Mail", 0, KEY_QUERY_VALUE, &Key) == ERROR_SUCCESS)
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{
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Size = sizeof(Buffer);
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/* Any return value besides ERROR_FILE_NOT_FOUND (including success,
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ERROR_MORE_DATA) indicates the value is present */
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if (RegQueryValueExA(Key, NULL, NULL, &Type, Buffer, &Size) != ERROR_FILE_NOT_FOUND)
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{
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RegCloseKey(Key);
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return TRUE;
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}
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RegCloseKey(Key);
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HasHKCUKey = TRUE;
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}
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else
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HasHKCUKey = FALSE;
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Clients\\Mail", 0, KEY_QUERY_VALUE, &Key) == ERROR_SUCCESS)
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{
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Size = sizeof(Buffer);
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if (RegQueryValueExA(Key, NULL, NULL, &Type, Buffer, &Size) != ERROR_FILE_NOT_FOUND)
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{
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RegCloseKey(Key);
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return TRUE;
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}
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RegCloseKey(Key);
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return FALSE;
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}
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return ! HasHKCUKey;
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}
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