| Pakshin A. S. |
Дата 4.11.2004, 21:49 (ссылка)
 |  (нет голосов)
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Эксперт
Профиль
Группа: Участник Клуба
Сообщений: 5056
Регистрация: 16.2.2003
Репутация: нет
Всего: 61
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| Код |
unit TestRosh;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls,
Forms, Dialogs, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Panel1: TPanel;
Label1: TLabel;
PortCombo: TComboBox;
Label2: TLabel;
BaudCombo: TComboBox;
Label3: TLabel;
ByteSizeCombo: TComboBox;
Label4: TLabel;
ParityCombo: TComboBox;
Label5: TLabel;
StopBitsCombo: TComboBox;
Label6: TLabel;
Memo1: TMemo;
Edit1: TEdit;
Button1: TButton;
Memo2: TMemo;
Edit2: TEdit;
Label7: TLabel;
Button2: TButton;
Label8: TLabel;
Edit3: TEdit;
procedure Button1Click(Sender: TObject);
procedure Memo2Change(Sender: TObject);
procedure Memo1Change(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure PortComboChange(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure Memo1DblClick(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
uses
Registry;
var
hPort: THandle;
procedure TForm1.Memo1Change(Sender: TObject);
var
i: Integer;
begin
Edit1.Text := '';
for i := 1 to Length(Memo1.Text) do
Edit1.Text := Edit1.Text + Format('%x', [Ord(Memo1.Text[i])]) + ' '
end;
procedure TForm1.Memo2Change(Sender: TObject);
var
i: Integer;
begin
Edit2.Text := '';
for i := 1 to Length(Memo2.Text) do
Edit2.Text := Edit2.Text + Format('%x', [Ord(Memo2.Text[i])]) + ' '
end;
procedure TForm1.Button1Click(Sender: TObject);
var
S, D: array[0..127] of Char;
actual_bytes: Integer;
DCB: TDCB;
begin
FillChar(S, 128, #0);
FillChar(D, 128, #0);
DCB.DCBlength := SizeOf(DCB);
if not GetCommState(hPort, DCB) then
begin
ShowMessage('Can not get port state: ' + IntToStr(GetLastError));
Exit;
end;
try
DCB.BaudRate := StrToInt(BaudCombo.Text);
except
BaudCombo.Text := IntToStr(DCB.BaudRate);
end;
try
DCB.ByteSize := StrToInt(ByteSizeCombo.Text);
except
ByteSizeCombo.Text := IntToStr(DCB.ByteSize);
end;
if ParityCombo.ItemIndex > -1 then
DCB.Parity := ParityCombo.ItemIndex
else
ParityCombo.ItemIndex := DCB.Parity;
if StopBitsCombo.ItemIndex > -1 then
DCB.StopBits := StopBitsCombo.ItemIndex
else
StopBitsCombo.ItemIndex := DCB.StopBits;
if not SetCommState(hPort, DCB) then
begin
ShowMessage('Can not set new port settings: ' + IntToStr(GetLastError));
Exit;
end;
PurgeComm(hPort, PURGE_TXABORT or PURGE_RXABORT or PURGE_TXCLEAR or PURGE_RXCLEAR);
StrPCopy(S, Memo1.Text);
if not WriteFile(hPort, S, StrLen(S), actual_bytes, nil) then
begin
ShowMessage('Can not write to port: ' + IntToStr(GetLastError));
Exit;
end;
if not ReadFile(hPort, D, StrToInt(Edit3.Text), actual_bytes, nil) then
ShowMessage('Can not read from port: ' + IntToStr(GetLastError))
else
ShowMessage('Read ' + IntToStr(actual_bytes) + ' bytes');
Memo2.Text := D;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
with TRegistry.Create do
begin
OpenKey('Shkila', True);
WriteString('Port', PortCombo.Text);
WriteString('Baud Rate', BaudCombo.Text);
WriteString('Byte Size', ByteSizeCombo.Text);
WriteString('Parity', IntToStr(ParityCombo.ItemIndex));
WriteString('Stop Bits', IntToStr(StopBitsCombo.ItemIndex));
Destroy;
end;
if not CloseHandle(hPort) then
begin
ShowMessage('Can not close port: ' + IntToStr(GetLastError));
Exit;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
hPort := CreateFile(PChar(PortCombo.Text),
GENERIC_READ + GENERIC_WRITE,
0,
nil,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
if hPort = INVALID_HANDLE_VALUE then
ShowMessage('Can not open ' + PortCombo.Text + ': ' + IntToStr(GetLastError))
else
Button2.Hide;
end;
procedure TForm1.PortComboChange(Sender: TObject);
begin
FormDestroy(Sender);
Button2.Show;
end;
procedure TForm1.FormShow(Sender: TObject);
begin
with TRegistry.Create do
begin
OpenKey('Shkila', True);
PortCombo.Text := ReadString('Port');
BaudCombo.Text := ReadString('Baud Rate');
ByteSizeCombo.Text := ReadString('Byte Size');
ParityCombo.ItemIndex := StrToInt(ReadString('Parity'));
StopBitsCombo.ItemIndex := StrToInt(ReadString('Stop Bits'));
Destroy;
end;
end;
procedure TForm1.Memo1DblClick(Sender: TObject);
begin
Memo1.Lines.Clear;
Memo2.Lines.Clear;
Edit1.Text := '';
Edit2.Text := '';
end;
end.
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Пример программирования com портов 
