Windows class not created error?

[TheDelChop]

Hi, I am experiencing some real trouble with a simple windows program that I am trying to create. After running the CreateDialog() function, windows returns the error "Windows class not created". I am having trouble determing what this message is really telling me. The result of this error message is that after processing the WM_SETFONT message inside the DlgProc for the Dialog Box that it creates, Windows always processes the WM_DESTROY instead of the WM_INITDIALOG which is the next message that my other working windows programs processes which creates and displays the dialog box. I have posted my WinAPI function below: int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int nCmdShow) { MSG msg; HWND mainWnd; hInst = hInstance; // Make instance available globally InitCommonControls(); // Create a dummy window so the dialog box can have a parent window, then // create the dialog box itself. mainWnd = CreateWindow("", "", 0, 0, 0, 0, 0, NULL,(HMENU)-1, hInstance, 0); MainDlgBox = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_AURACONNECT), mainWnd, (DLGPROC)DlgProc); DWORD Err = GetLastError(); SetClassLong(mainWnd,GCL_HICON,IDI_EXE); // Standard Windows message loop while(GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } I understand that I probably don't need to create a dummy window to create a dialog box. Also, I can't post my DlgProc because it is so large and long, but is this the most likely source of this error? Thank you for anyone who can offer any help. Joe

[CPallini]

Can you post the code of the DlgProc? Please use pre tags to post code: <pre> ...your code here... </pre> :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

[TheDelChop]

Ok, its pretty long, but here you go. LRESULT CALLBACK DlgProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch(uMsg) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: switch(LOWORD(wParam)) { case IDCANCEL: DestroyWindow(MainDlgBox); PostQuitMessage(0); return TRUE; case IDC_SETIPADDR: // Adds fucntionality to the close button. SendDlgItemMessage(MainDlgBox, IDC_IPADDRESS, IPM_GETADDRESS, 0, (LPARAM)(LPDWORD)NewAddr); wsprintf(strAddr,"%d",NewAddr); SendCommand(&DataSocket, SET_IP_ADDRESS, sizeof(CommandStruct), messageFromHost); strAddr[cSetIP.length] = '\r'; SendCommand(&DataSocket, strAddr, strlen(strAddr), messageFromHost); MessageBox(NULL,"IP Address has been changed sucessfully","Address Changed",MB_OK); return TRUE; case IDC_SETIPMASK: SendDlgItemMessage(MainDlgBox, IDC_IPMASK, IPM_GETADDRESS, 0, (LPARAM)(LPDWORD)NewMask); wsprintf(strAddr,"%d",ConnectAddr); SendCommand(&DataSocket, SET_IP_MASK, sizeof(CommandStruct), messageFromHost); strAddr[cSetMask.length] = '\r'; SendCommand(&DataSocket, strAddr, strlen(strAddr), messageFromHost); MessageBox(NULL,"IP Mask has been changed sucessfully","Address Changed",MB_OK); return TRUE; case IDC_CONNECTBTN: WSAStartup(MAKEWORD(2, 0), &wsaData); SendDlgItemMessage(MainDlgBox, IDC_CONNECT, IPM_GETADDRESS,0, (LPARAM)(LPDWORD)ConnectAddr); wsprintf(strAddr,"%d",ConnectAddr); if(ConnectToSocket(MainDlgBox, &DataSocket, strAddr, DATA_PORT, WINSOCK_DATA_MESSAGE,FD_CONNECT|FD_CLOSE|FD_READ)) MessageBox(NULL,"Connection attempt with AuraNET Headbox was sucessfull!","Connected with AuraNET",NULL); else { if(MessageBox(NULL,"Connection attempt with AuraNET Headbox was unsucessfull!","Not Connected with AuraNET",MB_RETRYCANCEL) == IDRETRY) PostMessage(MainDlgBox,WM_COMMAND,(WPARAM)IDC_CONNECTBTN,0); else return TRUE; } EnableWindow(GetDlgItem(MainDlgBox,IDC_DISCONNECTBTN),TRUE); EnableWindow(GetDlgItem(MainDlgBox,IDC_SETIPADDR),TRUE); EnableWindow(GetDlgItem(MainDlgBox,IDC_SETIPMASK),TRUE); EnableWindow(GetDlgItem(MainDlgBox,IDC_GETSTATUS),TRUE); EnableWindow(GetDl

[CPallini]

Sorry for the delay, but rebuilding a project with that code took a bit of time. Anyway I don't get any error on my system, where CreateDialog works correctly. However, MSDN recommends, for modeless dialog, the following behaviour:

while (GetMessage(&msg, NULL, NULL, NULL))
{
if (!IsWindow(hwndGoto) || !IsDialogMessage(hwndGoto, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

to avoid processing not-dialog messages (hwndGoto is the dialog HWND, in the above snippet). I don't know if that helps you.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

[TheDelChop]

if you can build a project with no error on your system would you consider zipping it up and sending it to me/ posting it to see where we differ?

[CPallini]

TheDelChop wrote:

would you consider zipping it up and sending it to me

Yes, of course (by the way I need you e-mail address)

TheDelChop wrote:

posting it

I don't know how if it is possible to post zip files via the forum.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

[TheDelChop]

JDelCioppio@astromed.com Thank you so much, Joe

[Mark Salsbery]

Did you try my suggestion in the reply to your other post? Try changing SetClassLong(mainWnd,GCL_HICON,IDI_EXE); to SetClassLong(mainWnd,GCL_HICON,LoadIcon(hInstance, MAKEINTRESOURCE(IDI_EXE));

[Mark Salsbery]

Oops... Should be SetClassLongPtr(mainWnd, GCL_HICON, (LONG_PTR)LoadIcon(hInstance, MAKEINTRESOURCE(IDI_EXE))); And your parent window has no window class registered for it? Try making the dialog style overlapped and create it with parent HWND = NULL. Mark