生成的dll文件,在调用时出现了错误?
library dll_demo1;
uses
SysUtils,
Classes,
forms,
Unitform1 in 'Unitform1.pas' {Form1};function showform:integer;stdcall;
var
form:Tform1;
begin
form:=tform1.create(application);
form1.free;
end;
exports
showform;
{$R *.res}begin
end.
library dll_demo1;
uses
SysUtils,
Classes,
forms,
Unitform1 in 'Unitform1.pas' {Form1};function showform:integer;stdcall;
var
form:Tform1;
begin
form:=tform1.create(application);
form1.free;
end;
exports
showform;
{$R *.res}begin
end.
TFormPERSON = class(TForm)
private
{ Private declarations }
public
{ Public declarations }
end;
//些处的变量不再用,给其改个地方,如下(改变之一)
//var
// FormPERSON: TFormPERSON;
{ Declare the export function 宣布Form函数出口}//改变之二
function ShowPerSN(AHandle: THandle; ACaption: String):BOOL; StdCall;
implementation
{$R *.DFM}
//函数据过程定义
function ShowPerSN(AHandle: THandle; ACaption: String):BOOL;
var
FormPERSON: TFormPERSON; //定义窗体类(上面的放到了此处)
begin
// Copy application handle to DLL's TApplication object
//拷贝应用程式句柄给DLL的应有程式对象
Application.Handle := AHandle;
FormPERSON := TFormPERSON.Create(Application);//创建控件TForm
try
FormPERSON.Caption := ACaption;
FormPERSON.ShowModal;//显示此Form
// Pass the date back in Result
Result := False; //反回成功值
finally
FormPERSON.Free;
end;
end;三.DLL中函数及窗体的调用
==========================
1.调用方法一
--------------
implementation //在此的下方写明调用函数的DLL{$R *.DFM}
//DLL内函数调用
function PenniesToSoins(SourceResult:Integer):Integer;
StdCall external 'FIRSTDLL.DLL';........2.调用方法二
==============
type //在此创建一个函数类
// 1 -------------------------------
{ First, define a procedural data type, this should reflect the
procedure that is exported from the DLL. }
{ Create a new exception class to reflect a failed DLL load }
TShowPerSN = function (AHandle: THandle; ACaption: String): BOOL; StdCall;
EDLLLoadError = class(Exception);//同时分创建一个出错记录类
// 1 -------------------------------
TMAINCLTR = class(TForm) //这里不变,系统自动生成......procedure TMAINCLTR.ToolButton1Click(Sender: TObject);
var //按钮的调用事件:调用过程
LibHandle: THandle;
ShowPerSN: TShowPerSN;
begin
Application.Title:='人力资源管理系统DLL文件测试程式';
{ Attempt to load the DLL 尝试装入DLL文件}
LibHandle := LoadLibrary('MGRPERSN.DLL');
try
if LibHandle = 0 then
raise EDLLLoadError.Create('Unable to Load DLL(无法成功装入MGRPERSN.DLL)');
@ShowPerSN := GetProcAddress(LibHandle, 'ShowPerSN');
if not (@ShowPerSN = nil) then
ShowPerSN(Application.Handle, '人事资料管理')//呼叫出窗体
else
RaiseLastWin32Error;
finally
FreeLibrary(LibHandle); // Unload the DLL.
end;
end;