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