Фрагмент программы для, демонстрирующий обмен данными, с помощью сообщения WM_COPYDATA ( фрагмент выделен жирным шрифтом)

BOOL Dlg_OnCopyData(HWND hwnd, HWND hwndFrom, PCOPYDATASTRUCT cds) {

Edit_SetText(GetDlgItem(hwnd, cds->dwData? IDC_DATA2: IDC_DATA1),

(PTSTR) cds->lpData);

return(TRUE);

}

BOOL Dlg_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam) {

chSETDLGICONS(hwnd, IDI_COPYDATA);

// Initialize the edit controls with some test data.

Edit_SetText(GetDlgItem(hwnd, IDC_DATA1), TEXT("Some test data"));

Edit_SetText(GetDlgItem(hwnd, IDC_DATA2), TEXT("Some more test data"));

return(TRUE);

}

void Dlg_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify) {

switch (id) {

case IDCANCEL:

EndDialog(hwnd, id);

break;

case IDC_COPYDATA1:

case IDC_COPYDATA2:

if (codeNotify!= BN_CLICKED)

break;

HWND hwndEdit = GetDlgItem(hwnd,

(id == IDC_COPYDATA1)? IDC_DATA1: IDC_DATA2);

// Prepare the COPYDATASTRUCT.

COPYDATASTRUCT cds;

// Indicate which data field we're sending (0=ID_DATA1, 1=ID_DATA2)

cds.dwData = (DWORD) ((id == IDC_COPYDATA1)? 0: 1);

// Get the length (in bytes) of the data block we're sending.

cds.cbData = (Edit_GetTextLength(hwndEdit) + 1) * sizeof(TCHAR);

// Allocate a block of memory to hold the string.

cds.lpData = _alloca(cds.cbData);

// Put the edit control's string in the data block.

Edit_GetText(hwndEdit, (PTSTR) cds.lpData, cds.cbData);

// Get the caption of our window.

TCHAR szCaption[100];

GetWindowText(hwnd, szCaption, chDIMOF(szCaption));

// Enumerate through all the top-level windows with the same caption

HWND hwndT = NULL;

do {

hwndT = FindWindowEx(NULL, hwndT, NULL, szCaption);

if (hwndT!= NULL) {

FORWARD_WM_COPYDATA(hwndT, hwnd, &cds, SendMessage);

}

} while (hwndT!= NULL);

break;

}

}

INT_PTR WINAPI Dlg_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {

switch (uMsg) {

chHANDLE_DLGMSG(hwnd, WM_INITDIALOG, Dlg_OnInitDialog);

chHANDLE_DLGMSG(hwnd, WM_COMMAND, Dlg_OnCommand);

chHANDLE_DLGMSG(hwnd, WM_COPYDATA, Dlg_OnCopyData);

}

return(FALSE);

}

int WINAPI _tWinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {

DialogBox(hinstExe, MAKEINTRESOURCE(IDD_COPYDATA), NULL, Dlg_Proc);

return(0);

}

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