Can the code be streamlined?

#include <winsock2.h>
#include <windows.h>
#include "resource.h"

#define WIN32_LEAN_AND_MEAN

#define WM_SOCKET		100
#define IDC_EDIT_OUT	101
#define IDC_EDIT_IN		102
#define IDC_ListBox		2000

void vShowText(HWND	hChildHandle, char *szText);

char szServer[15] = "127.0.0.1";

//arrays to hold data
char RecvData[100];
char SendData[100] = "REQ";

int SendBytes = 0;
int RecvBytes = 0;

int nResult = 0;
int iResult = 0;

char buffer[100];
char error[100];

SOCKADDR_IN SockAddr;

SOCKET Socket = NULL;

HWND hlistbox = NULL;
HWND hEditOut = NULL;
HWND hEditIn = NULL;

LRESULT CALLBACK WinProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;

	switch(uMsg)
	{
	case WM_CREATE:
		{

			hlistbox = CreateWindowEx(NULL, "Listbox", NULL, WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_BORDER, 2, 40, 380, 160, hwnd, (HMENU)IDC_ListBox, GetModuleHandle(NULL), NULL);

			if(!hlistbox)
			{
				MessageBox(hwnd, "Could not create incoming edit box.", "Error", MB_OK | MB_ICONERROR);
			}

			HGDIOBJ hfDefault = GetStockObject(DEFAULT_GUI_FONT);

			// Create outgoing message box
			hEditOut=CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "", WS_CHILD|WS_VISIBLE|ES_AUTOVSCROLL|ES_AUTOHSCROLL, 2, 2, 160, 20, hwnd, (HMENU)IDC_EDIT_IN, GetModuleHandle(NULL), NULL);
			
			if(!hEditOut)
			{
				MessageBox(hwnd, "Could not create outgoing edit box.", "Error", MB_OK|MB_ICONERROR);

			}

			SendMessage(hEditOut, WM_SETTEXT, NULL, (LPARAM)"127.0.0.1");

			WSADATA WsaDat;
			nResult = WSAStartup(MAKEWORD(2,2), &WsaDat);

			if (nResult != 0)
			{
				MessageBox(hwnd, "Winsock Initialization Failed", "Critical Error", MB_OK);
				SendMessage(hwnd, WM_DESTROY, 0, 0);
				break;
			}

			memset(&SockAddr, 0, sizeof(sockaddr_in));
			memset(&RecvData, 0, sizeof(RecvData));
			memset(buffer, 0, sizeof(buffer));

			Socket = socket(AF_INET, SOCK_STREAM, 0);
			if (Socket == INVALID_SOCKET)
			{
				MessageBox(hwnd, "Socket creation failed", "Critical Error", MB_OK);
				SendMessage(hwnd, WM_DESTROY, 0, 0);
				break;
			}

			nResult = WSAAsyncSelect(Socket, hwnd, WM_SOCKET, (FD_CONNECT | FD_READ | FD_CLOSE));
			if (nResult)
			{
				MessageBox(hwnd, "WSAAsyncSelect failed", "Critical Error", MB_OK);
				SendMessage(hwnd, WM_DESTROY, 0, 0);
				break;
			}

		}break;
	case WM_PAINT:
		{
			hdc = BeginPaint(hwnd, &ps);
			EndPaint(hwnd, &ps);
			return(0);
		}break;
	case WM_DESTROY:
		{
			closesocket(Socket);
			WSACleanup();
			PostQuitMessage(0);

		}break;
	case WM_COMMAND:
		{
			switch(LOWORD(wParam))
			{
			case MENU_FILE_CONNECT:
				{
					SendMessage(hEditOut, WM_GETTEXT, sizeof(szServer), (LPARAM)(LPSTR)szServer);
					SockAddr.sin_addr.s_addr = inet_addr(szServer);
					SockAddr.sin_family = AF_INET;
					SockAddr.sin_port = htons(2006);

					iResult = connect(Socket, (struct sockaddr*)&SockAddr, sizeof(sockaddr));

					if (iResult == SOCKET_ERROR)
					{
						wsprintf(error, TEXT("Error Code: %d"), WSAGetLastError());
						MessageBox(hwnd, error, "Critical Error", MB_OK);
						return(0);
					}

				}break;
			case MENU_FILE_GET:
				{
					SendBytes = send(Socket, SendData, sizeof(SendData), 0);
					memset(RecvData, 0, sizeof(RecvData));				

				}break;
			default:break;
			}
		}break;
	case WM_SOCKET:
		{
			if (WSAGETSELECTERROR(lParam))
			{
				MessageBox(hwnd, "Connection to server failed", "ERROR", MB_OK);
				SendMessage(hwnd, WM_DESTROY, 0, 0);
				break;
			}
			switch(WSAGETSELECTEVENT(lParam))
			{
			case FD_READ:
				{
					char szIncoming[100];
					ZeroMemory(szIncoming, sizeof(szIncoming));

					RecvBytes = recv(Socket, (char*)szIncoming, sizeof(szIncoming)/sizeof(szIncoming[0]), 0);

					vShowText(hlistbox, szIncoming);


				}break;
			case FD_CONNECT:
				{

				}break;
			case FD_CLOSE:
				{
					closesocket(Socket);

				}break;
			default:break;
			}
		}break;
	}
	return(DefWindowProc(hwnd, uMsg, wParam, lParam));
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	WNDCLASSEX wc;
	HWND hwnd;

	wc.cbClsExtra = 0;
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.cbWndExtra = 0;
	wc.hbrBackground = HBRUSH(GetStockObject(BLACK_BRUSH));
	wc.hCursor = LoadCursor(hInstance, IDC_ARROW);
	wc.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
	wc.hIconSm = LoadIcon(hInstance, IDI_APPLICATION);
	wc.hInstance = hInstance;
	wc.lpfnWndProc = WinProc;
	wc.lpszClassName = "myClass";
	wc.lpszMenuName = "MainMenu";
	wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS | CS_OWNDC;
	
	if (!(RegisterClassEx(&wc)))
	{
		return(0);
	}

	if (!(hwnd = CreateWindowEx(NULL, "myClass", "Async Client", WS_VISIBLE | WS_OVERLAPPEDWINDOW, 200, 200, 800, 600, NULL, NULL, hInstance, NULL)))
	{
		return(0);
	}

	MSG msg;

	while(TRUE)
	{
		GetMessage(&msg, NULL, 0, 0);

		if(msg.message == WM_QUIT)
		{
			break;
		}

		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

return(0);
}

//=============================================================
//function used to display text into the listbox
//=============================================================
void vShowText(HWND	hChildHandle, char *szText)
{
	int Line;
	
	// add string to the listbox
	SendMessage(hChildHandle,LB_ADDSTRING,0,(LPARAM)szText);
	
	// determine number of items in listbox
	Line = SendMessage(hChildHandle,LB_GETCOUNT,0,0);
	
	// flag last item as the selected item, to scroll listbox down
	SendMessage(hChildHandle,LB_SETCURSEL,Line-1,0);
	
	// unflag all items to eliminate negative highlite
	SendMessage(hChildHandle,LB_SETCURSEL,-1,0);
}