Ciao a tutti! Devo sviluppare un prgramma GUI con c++ e ho iniziato a stendere il codiece per le cose più semplici, ma mi si è già presentato un problma.
Ho questi file di resource:
resource.rc
e resource.hcodice:#include "resource.h" #include "windows.h" ID_MENU MENU BEGIN POPUP "&File" BEGIN MENUITEM "&Apri...", ID_APRI MENUITEM "&Esci", ID_ESCI END POPUP "&Informazioni" BEGIN MENUITEM "A&bout", ID_ABOUT END END IDD_ABOUT DIALOG DISCARDABLE 0, 0, 239, 66 STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU CAPTION "Informazioni su..." FONT 8, "MS Sans Serif" BEGIN DEFPUSHBUTTON "&OK",IDOK,174,18,50,14 GROUPBOX "Informazioni su...",-1,7,7,225,52 CTEXT "Un esempio di Finestre",-1,16,18,144,33 END
e fin qui tutto bene, il problema si presenta quando tento di aprire il dialog: ecco il codicecodice:#define ID_MENU 101 #define ID_DIALOG_ABOUT 102 #define ID_APRI 1001 #define ID_ESCI 1002 #define ID_ABOUT 1011
Ho notato che la funzione DialogBox ritorna -1, ma non capisco dove sia l'errore... Ogni suggerimento è ben accettocodice:#include <windows.h> #include "resource.h" LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM); BOOL CALLBACK AboutDlgProc(HWND, UINT, WPARAM,LPARAM); char *szClassName = "NomeClasse"; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil) { HWND hwnd; /* This is the handle for our window */ MSG messages; /* Here messages to the application are saved */ WNDCLASSEX wincl; /* Data structure for the windowclass */ /* The Window structure */ wincl.hInstance = hInstance; wincl.lpszClassName = szClassName; wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */ wincl.style = CS_DBLCLKS; /* Catch double-clicks */ wincl.cbSize = sizeof (WNDCLASSEX); /* Use default icon and mouse-pointer */ wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION); wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION); wincl.hCursor = LoadCursor (NULL, IDC_ARROW); wincl.lpszMenuName = MAKEINTRESOURCE(ID_MENU); /* No menu */ wincl.cbClsExtra = 0; /* No extra bytes after the window class */ wincl.cbWndExtra = 0; /* structure or the window instance */ /* Use Windows's default color as the background of the window */ wincl.hbrBackground = (HBRUSH) COLOR_MENU; /* Register the window class, and if it fails quit the program */ if (!RegisterClassEx (&wincl)) exit(EXIT_FAILURE); /* The class is registered, let's create the program*/ hwnd = CreateWindowEx ( 0, /* Extended possibilites for variation */ szClassName, /* Classname */ "TitoloApp", /* Title Text */ WS_OVERLAPPED|WS_MINIMIZEBOX|WS_CAPTION|WS_SYSMENU, /* Windows style */ CW_USEDEFAULT, /* Windows decides the position */ CW_USEDEFAULT, /* where the window ends up on the screen */ 544, /* The programs width */ 375, /* and height in pixels */ HWND_DESKTOP, /* The window is a child-window to desktop */ NULL, /* No menu */ hInstance, /* Program Instance handler */ NULL /* No Window Creation data */ ); /* Make the window visible on the screen */ ShowWindow (hwnd, SW_SHOW); /* Run the message loop. It will run until GetMessage() returns 0 */ while (GetMessage (&messages, NULL, 0, 0)) { /* Translate virtual-key messages into character messages */ TranslateMessage(&messages); /* Send message to WindowProcedure */ DispatchMessage(&messages); } /* The program return-value is 0 - The value that PostQuitMessage() gave */ return messages.wParam; } /* This function is called by the Windows function DispatchMessage() */ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) /* handle the messages */ { case WM_DESTROY: PostQuitMessage (0); /* send a WM_QUIT to the message queue */ break; case WM_COMMAND: switch(wParam) { case ID_ESCI: PostQuitMessage (0); break; case ID_ABOUT: int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(ID_DIALOG_ABOUT), hwnd, AboutDlgProc); if(ret == -1) MessageBox(NULL,"Impossibile caricare file","Errore",NULL); break; } break; default: /* for messages that we don't deal with */ return DefWindowProc (hwnd, message, wParam, lParam); } return 0; } BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { switch(message) { case WM_INITDIALOG: return true; break; case WM_COMMAND: switch(LOWORD(wParam)) { case IDOK: EndDialog(hwnd, IDOK); break; } break; default: return false; } return true; }![]()

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