呼叫外部 DLL 中的函式

//早繫結

unit unit1;
inte***ce
uses
windows, messages, sysutils, variants, classes, graphics, controls, forms,
dialogs, stdctrls;
type
tform1 = class(tform)
button1: tbutton;
procedure button1click(sender: tobject);
private
public
end;
var form1: tform1;
//mb 函式的宣告：
function mb(hwnd: hwnd; lptext, lpcaption: pchar; utype: uint): integer; stdcall;
implementation
//function mb(hwnd: hwnd; lptext, lpcaption: pchar; utype: uint): integer;
// stdcall; external user32 name 'messageboxa';
//function mb(hwnd: hwnd; lptext, lpcaption: pchar; utype: uint): integer;
// stdcall; external 'user32.dll' name 'messageboxa';
//function mb(hwnd: longword; lptext, lpcaption: pchar; utype: longword): integer;
// stdcall; external 'user32.dll' name 'messageboxa';
//function mb(hwnd: cardinal; lptext, lpcaption: pchar; utype: cardinal): integer;
// stdcall; external 'user32.dll' name 'messageboxa';
//function mb(hwnd: cardinal; lptext, lpcaption: pchar; utype: cardinal): integer;
// stdcall;
function mb; external
'user32.dll' name 'messageboxa';
//呼叫測試：
procedure tform1.button1click(sender: tobject);
var t,b: pchar;
begin
t := '標題';
b := '內容';
mb(0,b,t,0);
end;
end.
//晚繫結unit unit1;
inte***ce
uses
windows, messages, sysutils, variants, classes, graphics, controls, forms,
dialogs, stdctrls;
type
//晚繫結，也就是動態呼叫外部函式主要用以下三個命令：
//loadlibrary：獲取 dll
//getprocaddress：獲取函式
//freelibrary：釋放
//定義乙個過程型別，引數要和需要的函式一致
tmb = function(hwnd: hwnd; lptext, lpcaption: pchar; utype: uint): integer; stdcall;
tform1 = class(tform)
button1: tbutton;
procedure button1click(sender: tobject);
procedure formcreate(sender: tobject);
procedure formdestroy(sender: tobject);
private
mb: tmb; 
inst: longword; 
public
end;
var form1: tform1;
implementation
procedure tform1.formcreate(sender: tobject);
begin
inst := loadlibrary('user32.dll');
if inst <> 0
then
mb := getprocaddress(inst, 'messageboxa'); 
end;
//呼叫測試：
procedure tform1.button1click(sender: tobject);
var t,b: pchar;
begin
t := '標題';
b := '內容';
mb(0,b,t,0);
end;
procedure tform1.formdestroy(sender: tobject);
begin
freelibrary(inst); 
end;
end.

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