WndProc() is not getting the messages I sent to it - c++

Question

I made a project that creates a DLL. This project uses the WFS methods and they access some hardware (devices) to get information or execute some commands.
In my project, I first open these devices then register them, I later use other methods to get information or execute.
HRESULT extern WINAPI WFSOpen ( LPSTR lpszLogicalName, HAPP hApp, LPSTR lpszAppID, DWORD dwTraceLevel, DWORD dwTimeOut, DWORD dwSrvcVersionsRequired, LPWFSVERSION lpSrvcVersion, LPWFSVERSION lpSPIVersion, LPHSERVICE lphService);
HRESULT extern WINAPI WFSRegister ( HSERVICE hService, DWORD dwEventClass, HWND hWndReg);
As you can see, the WFSRegister requires HWND as a parameter. WFSRegister uses this parameter to send events or messages to it.
My project is not an MFC project and I have no windows. I decided to create a window and assign the correct HWND to WFSRegister. I also created WndProc to get the messages that the WFS methods will send to me later.
LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WFS_EXECUTE_EVENT:
cout<<"WFS_EXECUTE_EVENT";
break;
case WFS_SERVICE_EVENT:
cout<<"WFS_EXECUTE_EVENT";
break;
case WFS_USER_EVENT:
cout<<"WFS_USER_EVENT";
break;
case WFS_SYSTEM_EVENT:
cout<<"WFS_SYSTEM_EVENT";
break;
}
return DefWindowProc(hWnd, msg, wParam, lParam );
}
void Init_Window()
{
WNDCLASS Wclass;
Wclass.hInstance = gHinstance;
Wclass.cbClsExtra = 0;
Wclass.cbWndExtra = 0;
Wclass.lpszClassName = TEXT("Device_Manager_Class_Name");
Wclass.lpszMenuName = NULL;
Wclass.lpfnWndProc = WndProc;
Wclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
Wclass.hCursor = LoadIcon(NULL, IDC_ARROW);
Wclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
Wclass.style = CS_OWNDC;
if(!RegisterClass(&Wclass))
{
cout<<"Unable to Register Class";
}
ULONG Window_Width;
ULONG Window_Height;
DWORD style;
Window_Width = SCREEN_WIDTH;
Window_Height = SCREEN_HEIGHT;
style = WS_OVERLAPPED|WS_SYSMENU;
gHwnd = CreateWindow(TEXT("Device_Manager_Class_Name")
, TEXT("Device_Manager_Class_Title")
, style
, 0
, 0
, Window_Width
, Window_Height
, GetDesktopWindow()
, NULL
, gHinstance
, NULL);
if(!gHwnd){
cout<<"Unable to create the main window";
}
ShowWindow(gHwnd, SW_SHOW);
UpdateWindow(gHwnd);
SetFocus(gHwnd);
}
Init_Window() Successfully create window, I have no prob here.
When I want to register my device, I call the following code to get the correct HWND:
HWND windows_handle = FindWindow(TEXT("Device_Manager_Class_Name"), 0);
HRESULT result = WFSRegister(wfsRes.hService, WFS_EXECUTE_EVENT || WFS_SERVICE_EVENT || WFS_USER_EVENT || WFS_SYSTEM_EVENT , windows_handle);
result is S_OK(meaning the device registered successfully) and windows_handle refers to the same HWND I created in Init_Window(). For example, both have 0x00100a58 values.
Now I change some property on my devices and I expect to get these message on my WndProc(), but it's not working.
WndProc() working somehow and gets some messages, but not the ones I want (not the ones the devices send to it).
I'm sure the devices send message (as events) because I can see they do by reading their logs.
For example:
2013/09/25 16:46:29 HService : 44 Event WFS_SRVE_SIU_PORT_STATUS Sent for HWND = 330d1c hResult = WFS_SUCCESS
HWND in the log refers to same HWND I created in Init_Window() and windows_handle.
Also, you all got what I want to do. If you have any other solution please feel free to mention it.

Answer 1

I found solution thanks to dear Igor Tandetnik
All i needed to do is to add GetMessage()
MSG msg;
BOOL bRet;
HWND windows_handle = FindWindow(TEXT("Device_Manager_Class_Name"), 0);
while( (bRet = GetMessage( &msg, windows_handle, 0, 0 )) != 0)
{
if (bRet == -1)
{
// handle the error and possibly exit
}
else
{
TranslateMessage(&msg);
DispatchMessage(&msg); //<< This line send msg to WndProc()
}
}