Dialog boxes are not created WinAPI - c++

Question

If I create a child window (In this case window "About") to the main window, the dialog box for some reason is not called. If you do not the child window is a dialog box called normal and works fine. GetLastError returns the error number 1812 (The specified image file did not contain a resource section.). But from a resource file everything is fine. And as I said, if you do not create a child window then everything works fine. What's the problem?
#include <windows.h>
#include "resource.h"
LONG WINAPI WndProc(HWND, UINT, WPARAM,LPARAM);
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK PointsProc(HWND hPoints, UINT message, WPARAM wParam,LPARAM lParam);
HINSTANCE hInst;
HWND hPoints;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
hInst = hInstance;
HWND hwnd;
MSG msg;
WNDCLASS w;
memset(&w,0,sizeof(WNDCLASS));
w.style = CS_HREDRAW | CS_VREDRAW;
w.lpfnWndProc = WndProc;
w.hInstance = hInstance;
w.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
w.lpszClassName = L"My Class";
RegisterClass(&w);
hwnd = CreateWindow(L"My Class", L"My title", WS_OVERLAPPEDWINDOW,
300, 200, 200, 180, NULL, NULL, hInstance, NULL);
HMENU main_menu = CreateMenu();
AppendMenu(main_menu, MF_STRING, 1111, L"Box");
WNDCLASS w2;
memset(&w2, 0, sizeof(WNDCLASS));
w2.lpfnWndProc = (WNDPROC)PointsProc;
w2.hInstance = hInst;
w2.lpszClassName = L"About";
w2.hCursor = LoadCursor(NULL, IDC_ARROW);
w2.hbrBackground = (HBRUSH)CreateSolidBrush(RGB(111, 111, 111));
RegisterClass(&w2);
hPoints = CreateWindowEx(0, L"About", (LPCTSTR) NULL,
WS_CHILD | WS_BORDER | WS_VISIBLE | WS_DISABLED, 10, 10,
100, 100, hwnd, (HMENU)1112, hInst, NULL);
ShowWindow(hPoints,SW_NORMAL);
UpdateWindow(hPoints);
SetMenu(hwnd, main_menu);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LONG WINAPI WndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{
switch (Message)
{
case WM_COMMAND:
switch(LOWORD(wparam))
{
case 1111:
DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG1), hwnd, About);
return 0;
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, Message, wparam, lparam);
}
return 0;
}
LRESULT CALLBACK PointsProc(HWND hPoints, UINT message, WPARAM wParam,LPARAM lParam)
{
switch(message)
{
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_PAINT:
break;
default:
return DefWindowProc(hPoints, message, wParam, lParam);
}
return 0;
}
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}

Answer 1

The dialog box is called, only it takes a long time because PointsProc() is looping...
The problem was the break; while handling WM_PAINT in PointsProc() -- it then skips calling DefWindowProc(), so the window keeps getting WM_PAINT messages because the window remains invalid.
// case WM_PAINT:
// break;