Make only part of a window scrollable in win32 api - c

Question

I have created a working application with pure win32 APIs and C. It has a shared "status area" on top. Rest of the area displays device information (multiple fields per device).
How do I make the device information area only scrollable?
All my widgets are currently attached to single main window handle. See here the picture about what I want :
There must be a simple way to like group the widgets of bottom page and attach scrollbar to only the group, but I cannot seem to find a working technique with google. I guess my problem is I do not know hot to create groups of widgets or something. Attaching scrollbar to to the full window works fine but I want only partial.
For those interested: I'm using Dev-C++ 5.11 with TDM-GCC 4.9.2 . I don't have and won't have a resource editor. It is all in C code.
Help!
Edit1: Ok, I believe the correct term I need to search for is "child windows" per https://learn.microsoft.com/en-us/windows/win32/winmsg/window-features#child-windows
Edi2: This old scavenged code worked somewhat: https://cboard.cprogramming.com/windows-programming/94197-creating-child-window-parent-window-post676608.html#post676608 . It creates ugly window inside window but it is what I need to get started.

Answer 1

Ok, i reduced the code into a minimum: https://gist.github.com/usvi/b39713e270f1f75880698baacd1774b4 or
#include <windows.h>
LRESULT CALLBACK HelloWndProc (HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCMLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("HelloApplication");
HWND hwnd,hwnd2;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = HelloWndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = sizeof(long);
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows 95/98/NT"),
szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName,
TEXT("Hello World for Windows"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
400,
400,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
hwnd2 = CreateWindow(szAppName,
TEXT("Hello World"),
WS_CHILD | WS_VISIBLE | WS_VSCROLL,
CW_USEDEFAULT,
CW_USEDEFAULT,
300,
300,
hwnd,
NULL,
hInstance,
NULL);
ShowWindow(hwnd2, iCmdShow);
UpdateWindow(hwnd2);
while (GetMessage(&msg, NULL, 0, 0)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK HelloWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_CREATE:
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message){
case WM_CREATE:
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
DrawText(hdc, TEXT("Hello, Windows"), -1, &rect,
DT_SINGLELINE | DT_CENTER | DT_VCENTER);
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
And it works, see:
My problem basically was that child window creation CreateWindow() first parameter was omitted or otherwise wrong. It needs to match named and registered WNDCLASS.
NOTE: This is a rough rough rough sketch, I might need to make 2 classes and second message handler. But this is a good start.