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tony |
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procedure TFBClientAPI.LoadIBLibrary;
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function DoLoadLibrary(LibName: string): TLibHandle;
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begin
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Result := LoadLibrary(PChar(LibName));
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if Result <> NilHandle then
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begin
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FFBLibraryName := ExtractFileName(LibName);
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FFBLibraryPath := ExtractFileDir(LibName);
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end;
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end;
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var InstallDir: string;
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dllPathName: string;
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oldFirebirdEV: string;
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begin
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if IBLibrary <> NilHandle then Exit;
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{First try any user override}
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dllPathName := GetOverrideLibName;
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if dllPathName <> '' then
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begin
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IBLibrary := DoLoadLibrary(dllPathName);
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Exit;
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end;
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{Then look in application installation directory}
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InstallDir := ExtractFilePath(Paramstr(0)); {Using ParamStr(0) assumes windows conventions}
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//First look for Firebird Embedded Server in installation dir
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if FileExists(InstallDir + FIREBIRD_EMBEDDED) then
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begin
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dllPathName := InstallDir + FIREBIRD_EMBEDDED;
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IBLibrary := DoLoadLibrary(dllPathName)
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end
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else
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//Otherwise look for Firebird Client in installation dir
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if FileExists(InstallDir + FIREBIRD_CLIENT) then
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begin
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//assume firebird.conf and firebird.msg in same dir
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oldFirebirdEV := GetEnvironmentVariable('FIREBIRD');
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SetEnvironmentVariable('FIREBIRD',PChar(InstallDir));
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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try
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IBLibrary := DoLoadLibrary(dllPathName)
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finally
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if IBLibrary = NILHandle then
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SetEnvironmentVariable('FIREBIRD',PChar(oldFirebirdEV)); {restore}
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end;
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end;
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// writeln('Dir = ',InstallDir);
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{If FIREBIRD environment variable available then try this}
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if IBLibrary = NilHandle then
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begin
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InstallDir := GetEnvironmentVariable('FIREBIRD');
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if (length(InstallDir) > 0) and (InstallDir[length(InstallDir)] <> DirectorySeparator) then
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InstallDir += DirectorySeparator;
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if (InstallDir <> '') and FileExists(InstallDir + FIREBIRD_CLIENT) then
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begin
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//assume firebird.conf and firebird.msg in same dir
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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IBLibrary := DoLoadLibrary(dllPathName)
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end
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else
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if (InstallDir <> '') and FileExists(InstallDir + 'bin' + DirectorySeparator + FIREBIRD_CLIENT) then
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begin
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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IBLibrary := DoLoadLibrary(dllPathName)
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end
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end;
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if IBLibrary = NilHandle then
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{Use Registry key if it exists to locate library}
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begin
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with TRegistry.Create do
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try
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RootKey := HKEY_LOCAL_MACHINE;
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if OpenKey('SOFTWARE\Firebird Project\Firebird Server\Instances',false) then
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begin
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if ValueExists('DefaultInstance') then
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begin
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InstallDir := ReadString('DefaultInstance') + 'bin' + DirectorySeparator ;
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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IBLibrary := DoLoadLibrary(dllPathName)
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end
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end
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finally
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Free
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end;
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{Now try default install dir}
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if IBLibrary = NilHandle then
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begin
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InstallDir := GetWindowsSpecialDir(CSIDL_PROGRAM_FILES) +
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DirectorySeparator + 'Firebird' +
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DirectorySeparator + 'Firebird_3_0' +
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DirectorySeparator + 'bin' + DirectorySeparator;
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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IBLibrary := DoLoadLibrary(dllPathName)
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end;
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if IBLibrary = NilHandle then
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begin
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InstallDir := GetWindowsSpecialDir(CSIDL_PROGRAM_FILES) +
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DirectorySeparator + 'Firebird' +
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DirectorySeparator + 'Firebird_2_5' +
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DirectorySeparator + 'bin' + DirectorySeparator;
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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IBLibrary := DoLoadLibrary(dllPathName)
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end;
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if IBLibrary = NilHandle then
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begin
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InstallDir := GetWindowsSpecialDir(CSIDL_PROGRAM_FILES) +
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DirectorySeparator + 'Firebird' +
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DirectorySeparator + 'Firebird_2_1' +
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DirectorySeparator + 'bin' + DirectorySeparator;
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dllPathName := InstallDir + FIREBIRD_CLIENT;
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IBLibrary := DoLoadLibrary(dllPathName)
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end;
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//Otherwise see if Firebird client is in path
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//and rely on registry for location of firebird.conf and firebird.msg
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if IBLibrary = NilHandle then
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begin
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IBLibrary := DoLoadLibrary(FIREBIRD_CLIENT);
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if IBLibrary <= HINSTANCE_ERROR then
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//well maybe InterBase is present...
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IBLibrary := DoLoadLibrary(IBASE_DLL);
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end;
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end;
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FOwnsIBLibrary := IBLibrary <> NilHandle;
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end;
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