mirror of
https://github.com/Laex/Delphi-OpenCV.git
synced 2024-11-15 15:55:53 +01:00
320 lines
12 KiB
ObjectPascal
320 lines
12 KiB
ObjectPascal
unit moduleloader;
|
|
{
|
|
$Id: moduleloader.pas,v 1.4 2004/02/20 17:19:10 savage Exp $
|
|
|
|
}
|
|
{******************************************************************}
|
|
{ }
|
|
{ Project JEDI }
|
|
{ OS independent Dynamic Loading Helpers }
|
|
{ }
|
|
{ The initial developer of the this code is }
|
|
{ Robert Marquardt <robert_marquardt@gmx.de) }
|
|
{ }
|
|
{ Copyright (C) 2000, 2001 Robert Marquardt. }
|
|
{ }
|
|
{ Obtained through: }
|
|
{ Joint Endeavour of Delphi Innovators (Project JEDI) }
|
|
{ }
|
|
{ You may retrieve the latest version of this file at the Project }
|
|
{ JEDI home page, located at http://delphi-jedi.org }
|
|
{ }
|
|
{ The contents of this file are used with permission, subject to }
|
|
{ the Mozilla Public License Version 1.1 (the "License"); you may }
|
|
{ not use this file except in compliance with the License. You may }
|
|
{ obtain a copy of the License at }
|
|
{ http://www.mozilla.org/NPL/NPL-1_1Final.html }
|
|
{ }
|
|
{ Software distributed under the License is distributed on an }
|
|
{ "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or }
|
|
{ implied. See the License for the specific language governing }
|
|
{ rights and limitations under the License. }
|
|
{ }
|
|
{******************************************************************}
|
|
{
|
|
$Log: moduleloader.pas,v $
|
|
Revision 1.4 2004/02/20 17:19:10 savage
|
|
Added Calling convention to Win32 functions just in case.
|
|
|
|
Revision 1.3 2004/02/14 22:36:29 savage
|
|
Fixed inconsistencies of using LoadLibrary and LoadModule.
|
|
Now all units make use of LoadModule rather than LoadLibrary and other dynamic proc procedures.
|
|
|
|
Revision 1.2 2004/02/14 00:23:39 savage
|
|
As UNIX is defined in jedi-sdl.inc this will be used to check linux compatability as well. Units have been changed to reflect this change.
|
|
|
|
Revision 1.1 2004/02/14 00:04:50 savage
|
|
dllfuncs conflicts with FreePascal so it has been renamed back to the moduleloader.pas
|
|
|
|
Revision 1.1 2004/02/05 00:08:19 savage
|
|
Module 1.0 release
|
|
|
|
|
|
}
|
|
|
|
interface
|
|
|
|
{$i jedi-sdl.inc}
|
|
{$WEAKPACKAGEUNIT ON}
|
|
|
|
// each OS gets its own IFDEFed complete code block to make reading easier
|
|
|
|
{$IFDEF WIN32}
|
|
uses
|
|
Windows;
|
|
|
|
type
|
|
// Handle to a loaded DLL
|
|
TModuleHandle = HINST;
|
|
|
|
const
|
|
// Value designating an unassigned TModuleHandle od a failed loading
|
|
INVALID_MODULEHANDLE_VALUE = TModuleHandle(0);
|
|
|
|
function LoadModule(var Module: TModuleHandle; FileName: PChar): Boolean; stdcall;
|
|
function LoadModuleEx(var Module: TModuleHandle; FileName: PChar; Flags: Cardinal): Boolean; stdcall;
|
|
procedure UnloadModule(var Module: TModuleHandle); stdcall;
|
|
function GetModuleSymbol(Module: TModuleHandle; SymbolName: PChar): Pointer; stdcall;
|
|
function GetModuleSymbolEx(Module: TModuleHandle; SymbolName: PChar; var Accu: Boolean): Pointer; stdcall;
|
|
function ReadModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean; stdcall;
|
|
function WriteModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean; stdcall;
|
|
|
|
implementation
|
|
|
|
// load the DLL file FileName
|
|
// the rules for FileName are those of LoadLibrary
|
|
// Returns: True = success, False = failure to load
|
|
// Assigns: the handle of the loaded DLL to Module
|
|
// Warning: if Module has any other value than INVALID_MODULEHANDLE_VALUE
|
|
// on entry the function will do nothing but returning success.
|
|
|
|
function LoadModule(var Module: TModuleHandle; FileName: PChar): Boolean;
|
|
begin
|
|
if Module = INVALID_MODULEHANDLE_VALUE then
|
|
Module := LoadLibrary( FileName );
|
|
Result := Module <> INVALID_MODULEHANDLE_VALUE;
|
|
end;
|
|
|
|
// load the DLL file FileName
|
|
// LoadLibraryEx is used to get better control of the loading
|
|
// for the allowed values for flags see LoadLibraryEx documentation.
|
|
|
|
function LoadModuleEx(var Module: TModuleHandle; FileName: PChar; Flags: Cardinal): Boolean;
|
|
begin
|
|
if Module = INVALID_MODULEHANDLE_VALUE then
|
|
Module := LoadLibraryEx( FileName, 0, Flags);
|
|
Result := Module <> INVALID_MODULEHANDLE_VALUE;
|
|
end;
|
|
|
|
// unload a DLL loaded with LoadModule or LoadModuleEx
|
|
// The procedure will not try to unload a handle with
|
|
// value INVALID_MODULEHANDLE_VALUE and assigns this value
|
|
// to Module after unload.
|
|
|
|
procedure UnloadModule(var Module: TModuleHandle);
|
|
begin
|
|
if Module <> INVALID_MODULEHANDLE_VALUE then
|
|
FreeLibrary(Module);
|
|
Module := INVALID_MODULEHANDLE_VALUE;
|
|
end;
|
|
|
|
// returns the pointer to the symbol named SymbolName
|
|
// if it is exported from the DLL Module
|
|
// nil is returned if the symbol is not available
|
|
|
|
function GetModuleSymbol(Module: TModuleHandle; SymbolName: PChar): Pointer;
|
|
begin
|
|
Result := nil;
|
|
if Module <> INVALID_MODULEHANDLE_VALUE then
|
|
Result := GetProcAddress(Module, SymbolName );
|
|
end;
|
|
|
|
// returns the pointer to the symbol named SymbolName
|
|
// if it is exported from the DLL Module
|
|
// nil is returned if the symbol is not available.
|
|
// as an extra the boolean variable Accu is updated
|
|
// by anding in the success of the function.
|
|
// This is very handy for rendering a global result
|
|
// when accessing a long list of symbols.
|
|
|
|
function GetModuleSymbolEx(Module: TModuleHandle; SymbolName: PChar; var Accu: Boolean): Pointer;
|
|
begin
|
|
Result := nil;
|
|
if Module <> INVALID_MODULEHANDLE_VALUE then
|
|
Result := GetProcAddress(Module, SymbolName );
|
|
Accu := Accu and (Result <> nil);
|
|
end;
|
|
|
|
// get the value of variables exported from a DLL Module
|
|
// Delphi cannot access variables in a DLL directly, so
|
|
// this function allows to copy the data from the DLL.
|
|
// Beware! You are accessing the DLL memory image directly.
|
|
// Be sure to access a variable not a function and be sure
|
|
// to read the correct amount of data.
|
|
|
|
function ReadModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean;
|
|
var
|
|
Sym: Pointer;
|
|
begin
|
|
Result := True;
|
|
Sym := GetModuleSymbolEx(Module, SymbolName, Result);
|
|
if Result then
|
|
Move(Sym^, Buffer, Size);
|
|
end;
|
|
|
|
// set the value of variables exported from a DLL Module
|
|
// Delphi cannot access variables in a DLL directly, so
|
|
// this function allows to copy the data to the DLL!
|
|
// BEWARE! You are accessing the DLL memory image directly.
|
|
// Be sure to access a variable not a function and be sure
|
|
// to write the correct amount of data.
|
|
// The changes are not persistent. They get lost when the
|
|
// DLL is unloaded.
|
|
|
|
function WriteModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean;
|
|
var
|
|
Sym: Pointer;
|
|
begin
|
|
Result := True;
|
|
Sym := GetModuleSymbolEx(Module, SymbolName, Result);
|
|
if Result then
|
|
Move(Buffer, Sym^, Size);
|
|
end;
|
|
|
|
{$ENDIF}
|
|
|
|
{$IFDEF Unix}
|
|
uses
|
|
{$ifdef Linux}
|
|
Types,
|
|
Libc;
|
|
{$else}
|
|
dl,
|
|
Types,
|
|
Baseunix,
|
|
Unix;
|
|
{$endif}
|
|
type
|
|
// Handle to a loaded .so
|
|
TModuleHandle = Pointer;
|
|
|
|
const
|
|
// Value designating an unassigned TModuleHandle od a failed loading
|
|
INVALID_MODULEHANDLE_VALUE = TModuleHandle(nil);
|
|
|
|
function LoadModule(var Module: TModuleHandle; FileName: PChar): Boolean;
|
|
function LoadModuleEx(var Module: TModuleHandle; FileName: PChar; Flags: Cardinal): Boolean;
|
|
procedure UnloadModule(var Module: TModuleHandle);
|
|
function GetModuleSymbol(Module: TModuleHandle; SymbolName: PChar): Pointer;
|
|
function GetModuleSymbolEx(Module: TModuleHandle; SymbolName: PChar; var Accu: Boolean): Pointer;
|
|
function ReadModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean;
|
|
function WriteModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean;
|
|
|
|
implementation
|
|
|
|
// load the .so file FileName
|
|
// the rules for FileName are those of dlopen()
|
|
// Returns: True = success, False = failure to load
|
|
// Assigns: the handle of the loaded .so to Module
|
|
// Warning: if Module has any other value than INVALID_MODULEHANDLE_VALUE
|
|
// on entry the function will do nothing but returning success.
|
|
|
|
function LoadModule(var Module: TModuleHandle; FileName: PChar): Boolean;
|
|
begin
|
|
if Module = INVALID_MODULEHANDLE_VALUE then
|
|
Module := dlopen( FileName, RTLD_NOW);
|
|
Result := Module <> INVALID_MODULEHANDLE_VALUE;
|
|
end;
|
|
|
|
// load the .so file FileName
|
|
// dlopen() with flags is used to get better control of the loading
|
|
// for the allowed values for flags see "man dlopen".
|
|
|
|
function LoadModuleEx(var Module: TModuleHandle; FileName: PChar; Flags: Cardinal): Boolean;
|
|
begin
|
|
if Module = INVALID_MODULEHANDLE_VALUE then
|
|
Module := dlopen( FileName, Flags);
|
|
Result := Module <> INVALID_MODULEHANDLE_VALUE;
|
|
end;
|
|
|
|
// unload a .so loaded with LoadModule or LoadModuleEx
|
|
// The procedure will not try to unload a handle with
|
|
// value INVALID_MODULEHANDLE_VALUE and assigns this value
|
|
// to Module after unload.
|
|
|
|
procedure UnloadModule(var Module: TModuleHandle);
|
|
begin
|
|
if Module <> INVALID_MODULEHANDLE_VALUE then
|
|
dlclose(Module);
|
|
Module := INVALID_MODULEHANDLE_VALUE;
|
|
end;
|
|
|
|
// returns the pointer to the symbol named SymbolName
|
|
// if it is exported from the .so Module
|
|
// nil is returned if the symbol is not available
|
|
|
|
function GetModuleSymbol(Module: TModuleHandle; SymbolName: PChar): Pointer;
|
|
begin
|
|
Result := nil;
|
|
if Module <> INVALID_MODULEHANDLE_VALUE then
|
|
Result := dlsym(Module, SymbolName );
|
|
end;
|
|
|
|
// returns the pointer to the symbol named SymbolName
|
|
// if it is exported from the .so Module
|
|
// nil is returned if the symbol is not available.
|
|
// as an extra the boolean variable Accu is updated
|
|
// by anding in the success of the function.
|
|
// This is very handy for rendering a global result
|
|
// when accessing a long list of symbols.
|
|
|
|
function GetModuleSymbolEx(Module: TModuleHandle; SymbolName: PChar; var Accu: Boolean): Pointer;
|
|
begin
|
|
Result := nil;
|
|
if Module <> INVALID_MODULEHANDLE_VALUE then
|
|
Result := dlsym(Module, SymbolName );
|
|
Accu := Accu and (Result <> nil);
|
|
end;
|
|
|
|
// get the value of variables exported from a .so Module
|
|
// Delphi cannot access variables in a .so directly, so
|
|
// this function allows to copy the data from the .so.
|
|
// Beware! You are accessing the .so memory image directly.
|
|
// Be sure to access a variable not a function and be sure
|
|
// to read the correct amount of data.
|
|
|
|
function ReadModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean;
|
|
var
|
|
Sym: Pointer;
|
|
begin
|
|
Result := True;
|
|
Sym := GetModuleSymbolEx(Module, SymbolName, Result);
|
|
if Result then
|
|
Move(Sym^, Buffer, Size);
|
|
end;
|
|
|
|
// set the value of variables exported from a .so Module
|
|
// Delphi cannot access variables in a .so directly, so
|
|
// this function allows to copy the data to the .so!
|
|
// BEWARE! You are accessing the .so memory image directly.
|
|
// Be sure to access a variable not a function and be sure
|
|
// to write the correct amount of data.
|
|
// The changes are not persistent. They get lost when the
|
|
// .so is unloaded.
|
|
|
|
function WriteModuleData(Module: TModuleHandle; SymbolName: PChar; var Buffer; Size: Cardinal): Boolean;
|
|
var
|
|
Sym: Pointer;
|
|
begin
|
|
Result := True;
|
|
Sym := GetModuleSymbolEx(Module, SymbolName, Result);
|
|
if Result then
|
|
Move(Buffer, Sym^, Size);
|
|
end;
|
|
{$ENDIF}
|
|
|
|
{$IFDEF __MACH__} // Mach definitions go here
|
|
{$ENDIF}
|
|
|
|
end.
|