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https://gitlab.com/freepascal.org/fpc/source.git
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106 lines
2.9 KiB
ObjectPascal
106 lines
2.9 KiB
ObjectPascal
{
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Call InitialiseDllist before using any of the calls, and call ReleaseDllist
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when finished.
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}
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unit DllistDyn;
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{$mode objfpc}{$H+}
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interface
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uses
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dynlibs, SysUtils;
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{$PACKRECORDS C}
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{$IFDEF Unix}
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const
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pqlib = 'libpq.so';
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{$ENDIF}
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{$IFDEF Win32}
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const
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pqlib = 'libpq.dll';
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{$ENDIF}
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{$IFDEF Wince}
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const
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pqlib = 'libpq.dll';
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{$ENDIF}
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{$i dllisttypes.inc}
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var
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DLNewList : function : PDllist;cdecl;
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DLFreeList : procedure (_para1:PDllist);cdecl;
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DLNewElem : function (val : pointer) :PDlelem;cdecl;
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DLFreeElem : procedure (_para1:PDlelem);cdecl;
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DLGetHead : function (_para1:PDllist):PDlelem;cdecl;
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DLGetTail : function (_para1:PDllist):PDlelem;cdecl;
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DLRemTail : function (l:PDllist):PDlelem;cdecl;
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DLGetPred : function (_para1:PDlelem):PDlelem;cdecl;
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DLGetSucc : function (_para1:PDlelem):PDlelem;cdecl;
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DLRemove : procedure (_para1:PDlelem);cdecl;
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DLAddHead : procedure (list:PDllist; node:PDlelem);cdecl;
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DLAddTail : procedure (list:PDllist; node:PDlelem);cdecl;
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DLRemHead : function (list:PDllist):PDlelem;cdecl;
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{ Macro translated }
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Function DLE_VAL(elem : PDlelem) : pointer;
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Procedure InitialiseDllist;
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Procedure ReleaseDllist;
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var DllistLibraryHandle : TLibHandle;
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implementation
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var RefCount : integer;
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Procedure InitialiseDllist;
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begin
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inc(RefCount);
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if RefCount = 1 then
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begin
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DllistLibraryHandle := loadlibrary(pqlib);
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if DllistLibraryHandle = nilhandle then
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begin
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RefCount := 0;
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Raise EInOutError.Create('Can not load PosgreSQL client. Is it installed? ('+pqlib+')');
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end;
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pointer(DLNewList) := GetProcedureAddress(DllistLibraryHandle,'DLNewList');
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pointer(DLFreeList) := GetProcedureAddress(DllistLibraryHandle,'DLFreeList');
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pointer( DLNewElem) := GetProcedureAddress(DllistLibraryHandle,' DLNewElem');
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pointer(DLFreeElem) := GetProcedureAddress(DllistLibraryHandle,'DLFreeElem');
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pointer( DLGetHead) := GetProcedureAddress(DllistLibraryHandle,' DLGetHead');
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pointer( DLGetTail) := GetProcedureAddress(DllistLibraryHandle,' DLGetTail');
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pointer( DLRemTail) := GetProcedureAddress(DllistLibraryHandle,' DLRemTail');
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pointer( DLGetPred) := GetProcedureAddress(DllistLibraryHandle,' DLGetPred');
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pointer( DLGetSucc) := GetProcedureAddress(DllistLibraryHandle,' DLGetSucc');
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pointer(DLRemove) := GetProcedureAddress(DllistLibraryHandle,'DLRemove');
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pointer(DLAddHead) := GetProcedureAddress(DllistLibraryHandle,'DLAddHead');
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pointer(DLAddTail) := GetProcedureAddress(DllistLibraryHandle,'DLAddTail');
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pointer( DLRemHead) := GetProcedureAddress(DllistLibraryHandle,' DLRemHead');
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end;
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end;
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Procedure ReleaseDllist;
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begin
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if RefCount > 0 then dec(RefCount);
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if RefCount = 0 then
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begin
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if not UnloadLibrary(DllistLibraryHandle) then inc(RefCount);
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end;
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end;
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// This function is also defined in Dllist!
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Function DLE_VAL(elem : PDlelem) : pointer;
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begin
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DLE_VAL:=elem^.dle_val
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end;
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end.
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