Sebastian Ledesma

Hi: I'm using C++Builder 10.1, making a Win64, UNICODE, VCL with Styles (Auric) application. I want to have a program that runs only once at time. I've solved that part. int WINAPI _tWinMain(HINSTANCE, HINSTANCE, LPTSTR, int) { WM_REGISTERED_my_showRestore = RegisterWindowMessage(_T("myShowRestoreMessage)); HANDLE mailMutex = CreateMutex(NULL, true, _T("myAppMutex")); if( ERROR_ALREADY_EXISTS == GetLastError() ) { // Program already running somewhere if (__argc == 1) { HWND hWnd = FindWindow(NULL, _T("myVCLApplication")); if ( hWnd ) { //ShowWindowAsync( hWnd, SW_SHOW); // Make the window visible if it was hidden ShowWindow( hWnd, SW_SHOW); // Make the window visible if it was hidden //ShowWindowAsync( hWnd, SW_RESTORE); // Next, restore it if it was minimized ShowWindow( hWnd, SW_RESTORE); // Make the window visible if it was hidden SetForegroundWindow(hWnd); // Finally, activate the window //::SendMessage(hWnd, WM_REGISTERED_my_showRestore, 0, 0); //::SendMessage(HWND_BROADCAST, WM_REGISTERED_my_showRestore, 0, 0); ::PostMessage(hWnd, WM_REGISTERED_my_showRestore, 0, 0); // ::PostMessage(hWnd, WM_USER+2000, 0, 0); } } ... When the second instance runs I detect the previous instance and I want to SHOW / RESTORE that window. However I wasnt able to receive the message in the main Form. I've tried using: * TApplicationEvent (capturing OnMessage) * Application->OnMessage = AppMessage; * TForm1::WndProc(TMessage &message) but in all cases I wasnt able to receive the message. Any hints? I've tested the same calling code with a OWLNext based application and it worked like charm, but for some reason the Form dont receive the message. Thanks in advance. Sebas Application->OnMessage = AppMessage;