Another undefined reference to WinMain#16 issue - c++

Question

On Code::Blocks 13.12, I used the wizard to create a DX9 project by starting a new project. I specified the DX folder and it doesn't complain. An auto-generated .cpp appears and it's set to GUI application, file is not set to read-only mode, and I hit compile:
||=== Build: Debug in xxxxxxxx (compiler: GNU GCC Compiler) ===|
c:\program files\codeblocks\mingw\bin..\lib\gcc\mingw32\4.7.1......\libmingw32.a(main.o):main.c:(.text.startup+0xa7)||undefined reference to `WinMain#16'|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 2 second(s)) ===|
Here's the full code that's auto-generated:
#include <windows.h>
#include <d3d9.h>
#define NOMINMAX
LPDIRECT3D9 g_pD3D = NULL; // Used to create the D3DDevice
LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; // Our rendering device
HRESULT InitD3D( HWND hWnd )
{
if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
return E_FAIL;
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory( &d3dpp, sizeof( d3dpp ) );
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_pd3dDevice ) ) )
{
return E_FAIL;
}
return S_OK;
}
VOID Cleanup()
{
if( g_pd3dDevice != NULL )
g_pd3dDevice->Release();
if( g_pD3D != NULL )
g_pD3D->Release();
}
VOID Render()
{
if( NULL == g_pd3dDevice )
return;
// Clear the backbuffer to a blue color
g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB( 0, 0, 255 ), 1.0f, 0 );
// Begin the scene
if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
{
// Rendering of scene objects can happen here
// End the scene
g_pd3dDevice->EndScene();
}
// Present the backbuffer contents to the display
g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch( msg )
{
case WM_DESTROY:
Cleanup();
PostQuitMessage( 0 );
return 0;
case WM_PAINT:
Render();
ValidateRect( hWnd, NULL );
return 0;
}
return DefWindowProc( hWnd, msg, wParam, lParam );
}
INT WINAPI wWinMain( HINSTANCE hInst, HINSTANCE, LPWSTR, INT )
{
// Register the window class
WNDCLASSEX wc =
{
sizeof( WNDCLASSEX ), CS_CLASSDC, MsgProc, 0, 0,
GetModuleHandle( NULL ), NULL, NULL, NULL, NULL,
"D3D Tutorial", NULL
};
RegisterClassEx( &wc );
// Create the application's window
HWND hWnd = CreateWindow( "D3D Tutorial", "D3D Tutorial 01: CreateDevice",
WS_OVERLAPPEDWINDOW, 100, 100, 300, 300,
NULL, NULL, wc.hInstance, NULL );
// Initialize Direct3D
if( SUCCEEDED( InitD3D( hWnd ) ) )
{
// Show the window
ShowWindow( hWnd, SW_SHOWDEFAULT );
UpdateWindow( hWnd );
// Enter the message loop
MSG msg;
while( GetMessage( &msg, NULL, 0, 0 ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
}
UnregisterClass( "D3D Tutorial", wc.hInstance );
return 0;
}
Before the same questions are asked before in answers where this may have been solved, here's what's been tried:
1.Restarted Code::Blocks; still gives the same error.
2.Tried GUI and console; still gives the same error.
3.Tried with a blank application; still gives the same error.
4.Tried with a Windows GUI application; still gives the same error.
I am guaranteed that the DX SDK is setup and the runtime is up-to-date and everything else of the related such. Any other suggestions to this issue?

Answer 1

Replace this Microsoft monstrosity:
INT WINAPI wWinMain( HINSTANCE hInst, HINSTANCE, LPWSTR, INT )
with this standard C++ code:
int main()
That's it.
Your code appears to already be written for a standard main, e.g. you're using GetModuleHandle( 0 ) instead of the hInst from wWinMain.
If you want UTF-16 encoded process command line, just call GetCommandLine, and possibly CommandLineToArgvW (IIRC) to parse it. MinGW-64 does support wmain, via a special option. But with the two functions mentioned you can implement the wmain support in five to six lines of code, so it doesn't really matter, and I'd rather write the code than using an obscure option.