各位大大:
爬很多有關sendmessage的文了
2個exe之間想要用sendmessage互通訊息
但就是沒反應，請各位大大指教一下...感激

第一個sender_ap.exe
[code delphi]
unit sender;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
MyCopyDataStruct: TCopyDataStruct;
hTargetWnd: HWND;
begin
with MyCopyDataStruct do //待傳送的數據
begin
dwData := 0; // may use a value do identify content of message
cbData := StrLen(PChar('message')) 1; //長度
lpData := PChar('message'); //內容
end;
hTargetWnd := FindWindow(nil,PChar('reciver_ap')); // 查找窗体
if hTargetWnd <> 0 then
SendMessage(hTargetWnd,WM_COPYDATA,0,Longint(@MyCopyDataStruct));
end;
end.
[/code]

第二個reciver_ap.exe

[code delphi]
unit reciver;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Label1: TLabel;
private
procedure WMCopyData(var Msg: TWMCopyData);message WM_CopyData;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.WMCopyData(var Msg: TWMCopyData);
begin
Label1.Caption:='ok';
end;
end.
[/code]

{  請參考
The WM_COPYDATA messages makes it possible to transfer information
between processes. It does this by passing the data through the kernel.
Space is allocated in the receiving process to hold the information that is copied,
by the kernel, from the source process to the target process.
The sender passes a pointer to a COPYDATASTRUCT, which is defined as a structure
of the following:
}
type
TCopyDataStruct = packed record
dwData: DWORD; // anwendungsspezifischer Wert
cbData: DWORD; // Byte-Länge der zu übertragenden Daten
lpData: Pointer; // Adresse der Daten
end;
{************************************************************************}
{************************************************************************}
{ Sender Application }
unit SenderApp;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Edit1: TEdit;
Button2: TButton;
Image1: TImage;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
procedure SendCopyData(hTargetWnd: HWND; ACopyDataStruct:TCopyDataStruct);
public
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
// Sender: Send data
procedure TForm1.SendCopyData(hTargetWnd: HWND; ACopyDataStruct:TCopyDataStruct);
begin
if hTargetWnd <> 0 then
SendMessage(hTargetWnd, WM_COPYDATA, Longint(Handle), Longint(@ACopyDataStruct))
else
ShowMessage('No Recipient found!');
end;
// Send Text from Edit1 to other app
// Text von Edit1 an andere Anwendung schicken
procedure TForm1.Button1Click(Sender: TObject);
var
MyCopyDataStruct: TCopyDataStruct;
hTargetWnd: HWND;
begin
// Set up a COPYDATASTRUCT structure for use with WM_COPYDATA
with MyCopyDataStruct do
begin
dwData := 0; // may use a value do identify content of message
cbData := StrLen(PChar(Edit1.Text)) 1; //Need to transfer terminating #0 as well
lpData := PChar(Edit1.Text)
end;
// Find the destination window for the WM_COPYDATA message
hTargetWnd := FindWindow(nil,PChar('Message Receiver'));
// send the structure to the receiver
SendCopyData(hTargetWnd, MyCopyDataStruct);
end;
// Send Image1 to other app
// Image1 an andere Anwendung schicken
procedure TForm1.Button2Click(Sender: TObject);
var
ms: TMemoryStream;
MyCopyDataStruct: TCopyDataStruct;
hTargetWnd: HWND;
begin
ms := TMemoryStream.Create;
try
image1.Picture.Bitmap.SaveToStream(ms);
with MyCopyDataStruct do
begin
dwData := 1;
cbData := ms.Size;
lpData := ms.Memory;
end;
// Search window by the window title
// Empfänger Fenster anhand des Titelzeilentextes suchen
hTargetWnd := FindWindow(nil,PChar('Message Receiver'));
// Send the Data
// Daten Senden
SendCopyData(hTargetWnd,MyCopyDataStruct);
finally
ms.Free;
end;
end;
end.
{*********************************************************************}
{ Receiver Application }
unit ReceiverApp;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, StdCtrls;
type
TForm1 = class(TForm)
Image1: TImage;
Label1: TLabel;
private
procedure WMCopyData(var Msg: TWMCopyData); message WM_COPYDATA;
{ Private-Deklarationen }
public
{ Public-Deklarationen }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.WMCopyData(var Msg: TWMCopyData);
var
sText: array[0..99] of Char;
ms: TMemoryStream;
begin
case Msg.CopyDataStruct.dwData of
0: { Receive Text, Text empfangen}
begin
StrLCopy(sText, Msg.CopyDataStruct.lpData, Msg.CopyDataStruct.cbData);
label1.Caption := sText;
end;
1: { Receive Image, Bild empfangen}
begin
ms := TMemoryStream.Create;
try
with Msg.CopyDataStruct^ do
ms.Write(lpdata^, cbdata);
ms.Position := 0;
image1.Picture.Bitmap.LoadFromStream(ms);
finally
ms.Free;
end;
end;
end;
end;
end.
//Form1.Caption:='Message Receiver'

------
What do we live for if not to make life less difficult for each other?

編輯記錄

感謝christie大大
我試了一下...可以了耶
重點是將{ Receiver Application }的Form1的Caption設定為Message Receiver
...
感謝您...