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{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by the Free Pascal development team
Implements OS dependent part for loading of dynamic libraries.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program 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.
**********************************************************************}
{$ifdef readinterface}
{ ---------------------------------------------------------------------
Interface declarations
---------------------------------------------------------------------}
type
TLibHandle = longint;
const
NilHandle = 0;
// these are for easier crossplatform construction of dll names in dynloading libs.
SharedSuffix = 'dll';
{$else}
{ ---------------------------------------------------------------------
Implementation section
---------------------------------------------------------------------}
uses
DosCalls;
threadvar
DynLibErrNo: cardinal;
DynLibErrPath: array [0..259] of char;
function LoadLibrary (const Name: AnsiString): TLibHandle;
var
Handle: longint;
begin
DynLibErrPath [0] := #0;
DynLibErrNo := DosLoadModule (@DynLibErrPath [0], SizeOf (DynLibErrPath),
PChar (Name), Handle);
if DynLibErrNo = 0 then
Result := Handle
else
Result := NilHandle;
end;
function GetProcedureAddress (Lib: TLibHandle; const ProcName: AnsiString): pointer;
var
P: pointer;
begin
DynLibErrPath [0] := #0;
DynLibErrNo := DosQueryProcAddr (Lib, 0, PChar (ProcName), P);
if DynLibErrNo = 0 then
Result := P
else
Result := nil;
end;
function UnloadLibrary (Lib: TLibHandle): boolean;
begin
DynLibErrPath [0] := #0;
DynLibErrNo := DosFreeModule (Lib);
Result := DynLibErrNo = 0;
end;
function GetDynLibsError: longint;
begin
GetDynLibsError := DynLibErrNo;
end;
function GetDynLibsErrorStr: string;
const
SysMsgFile: array [0..10] of char = 'OSO001.MSG'#0;
var
VarArr: array [1..9] of PChar;
OutBuf: array [0..999] of char;
RetMsgSize: cardinal;
RC: cardinal;
begin
if DynLibErrNo = 0 then
GetDynLibsErrorStr := ''
else
begin
VarArr [1] := @DynLibErrPath [0];
RC := DosGetMessage (@VarArr, 1, @OutBuf [0], SizeOf (OutBuf),
DynLibErrNo, @SysMsgFile [0], RetMsgSize);
if RC = 0 then
Result := StrPas (@OutBuf [0])
else
begin
WriteStr (Result, DynLibErrNo);
Result := 'Error ' + Result;
end;
if DynLibErrPath [0] <> #0 then
Result := StrPas (@DynLibErrPath [0]) + ' - ' + Result;
end;
end;
function GetLoadErrorStr: string;
begin
GetLoadErrorStr := GetDynLibsErrorStr;
end;
{$endif}
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