使用inpout32.dll将Visual Basic并行端口应用程序转换为Delphi [英] Converting Visual Basic parallel port app using inpout32.dll in to Delphi
问题描述
我已经得到了这个简单的VB应用程序和库,据说它可以打开连接到打印机端口0x378基地址的门/转门样式。
I've been given this simple VB application and library which I'm told can open a door/turnstyle attached to the printer port at 0x378 base address.
'Inp and Out declarations for port I/O using inpout32.dll.
Public Declare Function Inp Lib "inpout32.dll" Alias "Inp32" _
(ByVal PortAddress As Integer) _
As Integer
Public Declare Sub Out Lib "inpout32.dll" Alias "Out32" _
(ByVal PortAddress As Integer, _
ByVal Value As Integer)
------------------------------------------------------------------------------------
Option Explicit
Dim Value As Integer
Dim PortAddress As Integer
Private Sub cmdWriteToPort_Click()
'Write to a port.
Out PortAddress, Value
'Read back and display the result.
Text1.Text = Inp(PortAddress)
Value = Value + 1
If Value = 255 Then Value = 0
End Sub
Private Sub Form_Load()
'Test program for inpout32.dll
Value = 0
'Change PortAddress to match the port address to write to:
'(Usual parallel-port addresses are &h378, &h278, &h3BC)
PortAddress = &H378
End Sub
但是我需要在Delphi 5中将其重新编写才能集成到我的应用程序中。
However I need to re-write it in Delphi 5 to integrate in to my application.
- 是否可以访问通过D5使用同一个库吗?
- 我是使用以下代码在正确的方向吗?
//使用库对端口I / O的Inp和Out声明
//Inp and Out declarations for port I/O using library
function Inp(PortAddress:String); external 'inpout32.dll.dll'
begin
return ??
end;
procedure Output(PortAddress:String;Value:Integer); external 'inpout32.dll.dll'
procedure TForm1.FormActivate(Sender: TObject);
begin
//Test program for inpout32.dll
Value := 0;
//Change PortAddress to match the port address to write to:
//(Usual parallel-port addresses are &h378, &h278, &h3BC)
PortAddress := '&H378';
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
//Write to a port.
Output(PortAddress, Value);
//Read back and display the result.
Edit1.Text := Inp(PortAddress);
Value := Value + 1;
if Value = 255 then
Value := 0;
end;
我不确定如何声明库函数以及将变量声明为(& ; H378显然不是整数)
I'm not sure exactly how to declare the library functions and what to declare the variables as (&H378 is obviously not an integer)
谢谢
推荐答案
PortAddress被声明为Integer,所以不要使用字符串。您的代码应如下所示:
PortAddress is declared as an Integer, so don't use strings. Your code should look something like this:
//Inp and Out declarations for port I/O using inpout32.dll.
function Inp(PortAddress: Integer): Integer; stdcall; external 'inpout32.dll' name 'Inp32';
procedure Output(PortAddress, Value: Integer); stdcall; external 'inpout32.dll' name 'Out32';
procedure TForm1.FormActivate(Sender: TObject);
begin
//Test program for inpout32.dll
Value := 0;
//Change PortAddress to match the port address to write to:
//(Usual parallel-port addresses are $378, $278, $3BC)
PortAddress := $378;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
//Write to a port.
Output(PortAddress, Value);
//Read back and display the result.
Edit1.Text := IntToStr(Inp(PortAddress));
Value := Value + 1;
if Value = 255 then
Value := 0;
end;
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