動作環境

C++ Builder XE4

処理概要

2つのウィンドウ間で文字列を送受信する
- Form1: 送信側
- Form2: 受信側

参考

650_他のアプリへデータ ( 文字列や画像 ) の送信 ( Delphi 同士 ) by Mr.XRAY様
- Delphi実装
Daten mit WM_COPYDATA zwischen Prozessen austauschen
- C++ Builder実装

情報感謝です。
Herzlichen Dank!

実装

送信側 > Form1

Unit1.h

//---------------------------------------------------------------------------

# ifndef Unit1H
# define Unit1H
//---------------------------------------------------------------------------
# include <System.Classes.hpp>
# include <Vcl.Controls.hpp>
# include <Vcl.StdCtrls.hpp>
# include <Vcl.Forms.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE で管理されるコンポーネント
	TButton *Button1;
	void __fastcall Button1Click(TObject *Sender);
	void __fastcall FormShow(TObject *Sender);
private:	// ユーザー宣言
public:		// ユーザー宣言
	__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
# endif

Unit1.cpp

//---------------------------------------------------------------------------

# include <vcl.h>
# pragma hdrstop

# include "Unit1.h"
# include "Unit2.h"
//---------------------------------------------------------------------------
# pragma package(smart_init)
# pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
	HWND hChild;

	hChild = FindWindow(NULL, L"Form2");
	if (hChild == NULL) {
		return;
	}

	TCopyDataStruct cds;
	char sndtxt[] = "Hello,World";
	cds.dwData = 1234; // 適当な値
	cds.cbData = (strlen(sndtxt) + 1) * sizeof(char);
	cds.lpData = &sndtxt;

	SendMessage(hChild, WM_COPYDATA, 0, (LPARAM)&cds);

}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormShow(TObject *Sender)
{
	Form2->Show();
}
//---------------------------------------------------------------------------

受信側 > Form2

Unit2.h

//---------------------------------------------------------------------------

# ifndef Unit2H
# define Unit2H
//---------------------------------------------------------------------------
# include <System.Classes.hpp>
# include <Vcl.Controls.hpp>
# include <Vcl.StdCtrls.hpp>
# include <Vcl.Forms.hpp>
//---------------------------------------------------------------------------

class TForm2 : public TForm
{
__published:	// IDE で管理されるコンポーネント
	TMemo *Memo1;
private:	// ユーザー宣言
public:		// ユーザー宣言
	void __fastcall WM_RecvString(TWMCopyData &cds);

BEGIN_MESSAGE_MAP
	MESSAGE_HANDLER(WM_COPYDATA, TWMCopyData, WM_RecvString);
END_MESSAGE_MAP(TForm)

	__fastcall TForm2(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm2 *Form2;
//---------------------------------------------------------------------------
# endif

Unit2.cpp

//---------------------------------------------------------------------------

# include <vcl.h>
# pragma hdrstop

# include "Unit2.h"
//---------------------------------------------------------------------------
# pragma package(smart_init)
# pragma resource "*.dfm"
TForm2 *Form2;
//---------------------------------------------------------------------------
__fastcall TForm2::TForm2(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm2::WM_RecvString(TWMCopyData &cds)
{
	char *ptxt = (char *)(cds.CopyDataStruct->lpData);
	Memo1->Lines->Add(String(ptxt));
}

結果

関連

考察 > ソフト間通信 > 最長100文字のコマンドを送信, 応答を受信