Модификация настроек BDE

Is there a way to change the IDAPI.CFG file from Delphi coding using the BDE API, since I wish to avoid having my users utilize the BDECFG.EXE utility?

Answer:

Here is a unit that is supposed to allow changing the config file:

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.

How can my program access the idapi.cfg file and probably change its INIT (Local Share etc.) section?

Answer:

For 32bit only. You can of course use the registry to determine the default CFG File instead of passing it as a parameter here:

procedure ModifyCFG(const ACFGFile, AValue, AEntry, ACFGPath: string; SaveAsWin31:
  bool);
var
  hCfg: hDBICfg;
  pRecBuf, pTmpRec: pByte;
  pFields: pFLDDesc;
  Count: word;
  i: integer;
  Save: boolean;
  Reg: TRegistry;
const
  RegSaveWIN31: array[bool] of string = ('WIN32', 'WIN31');
begin
  hCfg := nil;
  pFields := nil;
  pRecBuf := nil;
  Save := False;
  Check(DbiOpenConfigFile(PChar(ACFGFile), False, hCfg));
  try
    Check(DbiCfgPosition(hCfg, PChar(ACfgPath))); {neccessary...?}
    Check(DbiCfgGetRecord(hCfg, PChar(ACfgPath), Count, nil, nil));
    pRecBuf := AllocMem(succ(Count) * 128); {128 additional safety...}
    pFields := AllocMem(Count * sizeof(FLDDesc));
    Check(DbiCfgGetRecord(hCfg, PChar(ACfgPath), Count, pFields, pRecBuf));
    for i := 1 to Count do
    begin
      if StrPas(pFields^.szName) = AEntry then
      begin
        pTmpRec := pRecBuf;
        Inc(pTmpRec, 128 * (i - 1));
        StrPCopy(PChar(pTmpRec), AValue);
      end;
      inc(pFields);
    end;
    dec(pFields, Count);
    Check(DbiCfgModifyRecord(hCfg, PChar(ACfgPath), Count, pFields, pRecBuf));
    Save := True;
  finally
    if hCfg <> nil then
      Check(DbiCloseConfigFile(hCfg, Save, True, SaveAsWin31));
    if pRecBuf <> nil then
      FreeMem(pRecBuf, succ(Count) * 128);
    if pFields <> nil then
      FreeMem(pFields, Count * sizeof(FLDDesc));
  end;
  {update registry SAVECONFIG value}
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_LOCAL_MACHINE;
    if not Reg.OpenKey('SOFTWARE\Borland\Database Engine', False) then
      ShowMessage('Configuration Path not found')
    else
    begin
      Reg.LazyWrite := False;
      Reg.WriteString('SAVECONFIG', RegSaveWIN31[SaveAsWin31]);
      Reg.CloseKey;
    end;
  finally
    Reg.Free;
  end;
  {DbiExit/Init to re-read cfg... make absolutely sure there are no active 
        DB components when doing this (it's is best done by a loader app)}
  Session.Close;
  Session.Open;
end;

ACFGPath would be '\SYSTEM\INIT\', AEntry would be 'LOCAL SHARE' und AValue would be 'TRUE' or 'FALSE'.

Взято с Delphi Knowledge Base: https://www.baltsoft.com/