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{
NSIS ExDLL example
(C) 2001 - Peter Windridge
Fixed and formatted by Brett Dever
http://editor.nfscheats.com/
Tested in Delphi 7.0
}
library exdll;
uses Windows;
type
VarConstants = (
INST_0,
INST_1, // $1
INST_2, // $2
INST_3, // $3
INST_4, // $4
INST_5, // $5
INST_6, // $6
INST_7, // $7
INST_8, // $8
INST_9, // $9
INST_R0, // $R0
INST_R1, // $R1
INST_R2, // $R2
INST_R3, // $R3
INST_R4, // $R4
INST_R5, // $R5
INST_R6, // $R6
INST_R7, // $R7
INST_R8, // $R8
INST_R9, // $R9
INST_CMDLINE, // $CMDLINE
INST_INSTDIR, // $INSTDIR
INST_OUTDIR, // $OUTDIR
INST_EXEDIR, // $EXEDIR
INST_LANG, // $LANGUAGE
__INST_LAST
);
TVariableList = INST_0..__INST_LAST;
pstack_t = ^stack_t;
stack_t = record
next: pstack_t;
text: PChar;
end;
var
g_stringsize: integer;
g_stacktop: ^pstack_t;
g_variables: PChar;
g_hwndParent: HWND;
function PopString(): string;
var
th: pstack_t;
begin
if integer(g_stacktop^) <> 0 then begin
th := g_stacktop^;
Result := PChar(@th.text);
g_stacktop^ := th.next;
GlobalFree(HGLOBAL(th));
end;
end;
procedure PushString(const str: string='');
var
th: pstack_t;
begin
if integer(g_stacktop) <> 0 then begin
th := pstack_t(GlobalAlloc(GPTR, SizeOf(stack_t) + g_stringsize));
lstrcpyn(@th.text, PChar(str), g_stringsize);
th.next := g_stacktop^;
g_stacktop^ := th;
end;
end;
function GetUserVariable(const varnum: TVariableList): string;
begin
if (integer(varnum) >= 0) and (integer(varnum) < integer(__INST_LAST)) then
Result := g_variables + integer(varnum) * g_stringsize
else
Result := '';
end;
procedure SetUserVariable(const varnum: TVariableList; const value: string);
begin
if (value <> '') and (integer(varnum) >= 0) and (integer(varnum) < integer(__INST_LAST)) then
lstrcpy(g_variables + integer(varnum) * g_stringsize, PChar(value))
end;
procedure NSISDialog(const text, caption: string; const buttons: integer);
begin
MessageBox(g_hwndParent, PChar(text), PChar(caption), buttons);
end;
procedure ex_dll(const hwndParent: HWND; const string_size: integer; const variables: PChar; const stacktop: pointer); cdecl;
begin
// setup global variables
g_stringsize := string_size;
g_hwndParent := hwndParent;
g_stacktop := stacktop;
g_variables := variables;
// end global variable setup
NSISDialog(GetUserVariable(INST_0), 'The value of $0', MB_OK);
NSISDialog(PopString, 'pop', MB_OK);
PushString('Hello, this is a push');
SetUserVariable(INST_0, 'This is user var $0');
end;
exports ex_dll;
begin
end.
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