Managed C++/CLI

<br />
msgonly.cpp:<br />
<br />
#include <windows.h><br />
<br />
LRESULT CALLBACK MainWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);<br />
<br />
int APIENTRY WinMain(HINSTANCE hInstance,<br />
HINSTANCE hPrevInstance,<br />
LPSTR lpCmdLine,<br />
int nCmdShow)<br />
{<br />
	MSG msg; // MSG structure to store messages<br />
	WNDCLASSEX wcx; // WINDOW class information<br />
<br />
	// Initialize the struct to zero<br />
	ZeroMemory(&wcx,sizeof(WNDCLASSEX));<br />
	wcx.cbSize = sizeof(WNDCLASSEX); // Must always be sizeof(WNDCLASSEX)<br />
	wcx.style = NULL;<br />
	wcx.lpfnWndProc = (WNDPROC)MainWndProc; // Pointer to the callback procedure<br />
	wcx.cbClsExtra = 0; // Extra byte to allocate following the wndclassex structure<br />
	wcx.cbWndExtra = 0; // Extra byte to allocate following an instance of the structure<br />
	wcx.hInstance = hInstance; // Instance of the application<br />
	wcx.hIcon = NULL; // Class Icon<br />
	wcx.hCursor = NULL; <br />
	wcx.hbrBackground = NULL;<br />
	wcx.lpszMenuName = NULL; // Menu resource<br />
	wcx.lpszClassName = "MessageOnly"; // Name of this class<br />
	wcx.hIconSm = NULL; // Small icon for this class<br />
<br />
	// Register this window class with MS-Windows<br />
	if (!RegisterClassEx(&wcx))<br />
	return 0;<br />
<br />
	// Create the window<br />
	hwndMain = CreateWindowEx(WS_EX_LEFT, <br />
	"MessageOnly", // Window class name<br />
	NULL, // Window title<br />
	0, // Window style<br />
	0, // (x,y) pos of the window<br />
	0, // Width and height of the window<br />
	0, // HWND of the parent window (can be null also)<br />
	0, // Handle to menu<br />
	HWND_MESSAGE, // Make this window-less.<br />
	0, // Pointer to window creation data<br />
	hInstance,<br />
	0);<br />
<br />
	// Check if window creation was successful<br />
	if (!hwndMain)<br />
	return 0;<br />
<br />
	// Make the window visible<br />
	ShowWindow(hwndMain,SW_SHOW);<br />
	// Process messages coming to this window<br />
	while (GetMessage(&msg,NULL,0,0))<br />
	{<br />
		TranslateMessage(&msg);<br />
		DispatchMessage(&msg);<br />
	}<br />
<br />
	// return value to the system<br />
	return 0;<br />
}<br />
<br />
LRESULT CALLBACK MainWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)<br />
{<br />
	switch (msg)<br />
	{<br />
		case WM_DESTROY:<br />
		// User closed the window<br />
		PostQuitMessage(0);<br />
		break;<br />
		default:<br />
		// Call the default window handler<br />
		return DefWindowProc(hwnd,msg,wParam,lParam);<br />
	}<br />
	return 0;<br />
}<br />

<br />
Error E2451 msgonly.cpp 33: Undefined symbol 'hwndMain' in function __stdcall WinMain(HINSTANCE__ *,HINSTANCE__ *,char *,int)<br />