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Изменение конфигурации IDAPI



Автор: Eryk Bottomley

Возможно ли установить параметр MAXFILEHANDLES в IDAPI.CFG посредством Delphi?

Да. Следующий компонент показывает как это можно сделать (а также изменить другие параметры):


unit CFGTOOL;

interface

uses SysUtils, Classes, DB, DbiProcs, DbiTypes, DbiErrs;

type
  TBDEConfig = class(TComponent)
  private
    FLocalShare: Boolean;
    FMinBufSize: Integer;
    FMaxBufSize: Integer;
    FSystemLangDriver: string;
    FParadoxLangDriver: string;
    FMaxFileHandles: Integer;
    FNetFileDir: string;
    FTableLevel: string;
    FBlockSize: Integer;
    FDefaultDriver: string;
    FStrictIntegrity: Boolean;
    FAutoODBC: Boolean;

    procedure Init;
    procedure SetLocalShare(Value: Boolean);
    procedure SetMinBufSize(Value: Integer);
    procedure SetMaxBufSize(Value: Integer);
    procedure SetSystemLangDriver(Value: string);
    procedure SetParadoxLangDriver(Value: string);
    procedure SetMaxFileHandles(Value: Integer);
    procedure SetNetFileDir(Value: string);
    procedure SetTableLevel(Value: string);
    procedure SetBlockSize(Value: Integer);
    procedure SetDefaultDriver(Value: string);
    procedure SetAutoODBC(Value: Boolean);
    procedure SetStrictIntegrity(Value: Boolean);
    procedure UpdateCFGFile(path, item, value: string);

  protected

  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property LocalShare: Boolean read FLocalShare write SetLocalShare;
    property MinBufSize: Integer read FMinBufSize write SetMinBufSize;
    property MaxBufSize: Integer read FMaxBufSize write SetMaxBufSize;
    property SystemLangDriver: string
      read FSystemLangDriver write SetSystemLangDriver;
    property ParadoxLangDriver: string
      read FParadoxLangDriver write SetParadoxLangDriver;
    property MaxFileHandles: Integer
      read FMaxFileHandles write SetMaxFileHandles;
    property NetFileDir: string read FNetFileDir write SetNetFileDir;
    property TableLevel: string
      read FTableLevel write SetTableLevel;
    property BlockSize: Integer
      read FBlockSize write SetBlockSize;
    property DefaultDriver: string
      read FDefaultDriver write SetDefaultDriver;
    property AutoODBC: Boolean
      read FAutoODBC write SetAutoODBC;
    property StrictIntegrity: Boolean
      read FStrictIntegrity write SetStrictIntegrity;

  end;

procedure Register;

implementation

function StrToBoolean(Value: string): Boolean;
begin
  if (UpperCase(Value) = 'TRUE') or
    (UpperCase(Value) = 'ON') or
    (UpperCase(Value) = 'YES') or
    (UpperCase(Value) = '.T.') then
    Result := True
  else
    Result := False;
end;

function BooleanToStr(Value: Boolean): string;
begin
  if Value then
    Result := 'TRUE'
  else
    Result := 'FALSE';
end;

procedure Register;
begin
  RegisterComponents('Data Access', [TBDEConfig]);
end;

procedure TBDEConfig.Init;
var
  h: hDBICur;
  pCfgDes: pCFGDesc;
  n, v: string;
begin
  Check(DbiOpenCfgInfoList(nil, dbiREADWRITE, cfgPersistent, '\SYSTEM\INIT',
    h));
  GetMem(pCfgDes, sizeof(CFGDesc));
  try
    FillChar(pCfgDes^, sizeof(CFGDesc), #0);
    while (DbiGetNextRecord(h, dbiWRITELOCK, pCfgDes, nil) = DBIERR_NONE) do
    begin
      n := StrPas(pCfgDes^.szNodeName);
      v := StrPas(pCfgDes^.szValue);
      if n = 'LOCAL SHARE' then
        FLocalShare := StrToBoolean(v)
      else if n = 'MINBUFSIZE' then
        FMinBufSize := StrToInt(v)
      else if n = 'MAXBUFSIZE' then
        FMaxBufSize := StrToInt(v)
      else if n = 'MAXFILEHANDLES' then
        FMaxFileHandles := StrToInt(v)
      else if n = 'LANGDRIVER' then
        FSystemLangDriver := v
      else if n = 'AUTO ODBC' then
        FAutoODBC := StrToBoolean(v)
      else if n = 'DEFAULT DRIVER' then
        FDefaultDriver := v;
    end;
    if (h <> nil) then
      DbiCloseCursor(h);
    Check(DbiOpenCfgInfoList(nil, dbiREADWRITE, cfgPersistent,
      '\DRIVERS\PARADOX\INIT', h));
    FillChar(pCfgDes^, sizeof(CFGDesc), #0);
    while (DbiGetNextRecord(h, dbiWRITELOCK, pCfgDes, nil) = DBIERR_NONE) do
    begin
      n := StrPas(pCfgDes^.szNodeName);
      v := StrPas(pCfgDes^.szValue);
      if n = 'NET DIR' then
        FNetFileDir := v
      else if n = 'LANGDRIVER' then
        FParadoxLangDriver := v;
    end;
    if (h <> nil) then
      DbiCloseCursor(h);
    Check(DbiOpenCfgInfoList(nil, dbiREADWRITE, cfgPersistent,
      '\DRIVERS\PARADOX\TABLE CREATE', h));
    FillChar(pCfgDes^, sizeof(CFGDesc), #0);
    while (DbiGetNextRecord(h, dbiWRITELOCK, pCfgDes, nil) = DBIERR_NONE) do
    begin
      n := StrPas(pCfgDes^.szNodeName);
      v := StrPas(pCfgDes^.szValue);
      if n = 'LEVEL' then
        FTableLevel := v
      else if n = 'BLOCK SIZE' then
        FBlockSize := StrToInt(v)
      else if n = 'STRICTINTEGRITY' then
        FStrictIntegrity := StrToBoolean(v);
    end;
  finally
    FreeMem(pCfgDes, sizeof(CFGDesc));
    if (h <> nil) then
      DbiCloseCursor(h);
  end;
end;

procedure TBDEConfig.SetLocalShare(Value: Boolean);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'LOCAL SHARE', BooleanToStr(Value));
  FLocalShare := Value;
end;

procedure TBDEConfig.SetMinBufSize(Value: Integer);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'MINBUFSIZE', IntToStr(Value));
  FMinBufSize := Value;
end;

procedure TBDEConfig.SetMaxBufSize(Value: Integer);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'MAXBUFSIZE', IntToStr(Value));
  FMaxBufSize := Value;
end;

procedure TBDEConfig.SetSystemLangDriver(Value: string);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'LANGDRIVER', Value);
  FSystemLangDriver := Value;
end;

procedure TBDEConfig.SetParadoxLangDriver(Value: string);
begin
  UpdateCfgFile('\DRIVERS\PARADOX\INIT', 'LANGDRIVER', Value);
  FParadoxLangDriver := Value;
end;

procedure TBDEConfig.SetMaxFileHandles(Value: Integer);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'MAXFILEHANDLES', IntToStr(Value));
  FMaxFileHandles := Value;
end;

procedure TBDEConfig.SetNetFileDir(Value: string);
begin
  UpdateCfgFile('\DRIVERS\PARADOX\INIT', 'NET DIR', Value);
  FNetFileDir := Value;
end;

procedure TBDEConfig.SetTableLevel(Value: string);
begin
  UpdateCfgFile('\DRIVERS\PARADOX\TABLE CREATE', 'LEVEL', Value);
  FTableLevel := Value;
end;

procedure TBDEConfig.SetBlockSize(Value: Integer);
begin
  UpdateCfgFile('\DRIVERS\PARADOX\TABLE CREATE', 'BLOCK SIZE', IntToStr(Value));
  FBlockSize := Value;
end;

procedure TBDEConfig.SetStrictIntegrity(Value: Boolean);
begin
  UpdateCfgFile('\DRIVERS\PARADOX\TABLE CREATE', 'STRICTINTEGRITY',
    BooleanToStr(Value));
  FStrictIntegrity := Value;
end;

procedure TBDEConfig.SetDefaultDriver(Value: string);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'DEFAULT DRIVER', Value);
  FDefaultDriver := Value;
end;

procedure TBDEConfig.SetAutoODBC(Value: Boolean);
begin
  UpdateCfgFile('\SYSTEM\INIT', 'AUTO ODBC', BooleanToStr(Value));
  FAutoODBC := Value;
end;

procedure TBDEConfig.UpdateCFGFile;
var
  h: hDbiCur;
  pCfgDes: pCFGDesc;
  pPath: array[0..127] of char;
begin
  StrPCopy(pPath, Path);
  Check(DbiOpenCfgInfoList(nil, dbiREADWRITE, cfgPersistent, pPath, h));
  GetMem(pCfgDes, sizeof(CFGDesc));
  try
    FillChar(pCfgDes^, sizeof(CFGDesc), #0);
    while (DbiGetNextRecord(h, dbiWRITELOCK, pCfgDes, nil) = DBIERR_NONE) do
    begin
      if StrPas(pCfgDes^.szNodeName) = item then
      begin
        StrPCopy(pCfgDes^.szValue, value);
        Check(DbiModifyRecord(h, pCfgDes, True));
      end;
    end;
  finally
    FreeMem(pCfgDes, sizeof(CFGDesc));
    if (h <> nil) then
      DbiCloseCursor(h);
  end;
end;

constructor TBDEConfig.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Init;
end;

destructor TBDEConfig.Destroy;
begin
  inherited Destroy;
end;

end.






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