Trying to create a desktop application in C++ on visual studio - c++

Question

I'm trying to program a desktop application that will eventually communicate with an arduino (which has not come in yet) to control LED lights around my room and PC. I am on microsoft's page on how to create a desktop application and have copied 99% of this program off them so I could play around with it and see what it does. However I cannot even run the thing because of 2 issues.
When I try to use WndProc it says "function definition for WndProc not found and,
LRESULT CALLBACK WndProc(
_In_ HWND hWnd,
_In_ UINT message,
_In_ WPARAM wParam,
_In_ LPARAM lParam
);
When I try to use WinMain it says "Inconsistent annotation for WinMain: this instance has no annotations"
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
Here is the full source code:
#include <windows.h>
#include <tchar.h>
#include <stdlib.h>
#include <string.h>
static TCHAR szWindowClass[] = _T("Colour Control");
static TCHAR szTitle[] = _T("Colour Control 1.0");
HINSTANCE hInst;
int CALLBACK WinMain(
_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPSTR lpCmdLine,
_In_ int nCmdShow
);
LRESULT CALLBACK WndProc(
_In_ HWND hWnd,
_In_ UINT message,
_In_ WPARAM wParam,
_In_ LPARAM lParam
);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);
if (!RegisterClassEx(&wcex))
{
MessageBox(NULL,
_T("Call to RegisterClassEx failed!"),
_T("Windows Desktop Guided Tour"),
NULL);
return 1;
}
// The parameters to CreateWindow explained:
// szWindowClass: the name of the application
// szTitle: the text that appears in the title bar
// WS_OVERLAPPEDWINDOW: the type of window to create
// CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
// 500, 100: initial size (width, length)
// NULL: the parent of this window
// NULL: this application dows not have a menu bar
// hInstance: the first parameter from WinMain
// NULL: not used in this application
HWND hWnd = CreateWindow(
szWindowClass,
szTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
500, 100,
NULL,
NULL,
hInstance,
NULL
);
if (!hWnd)
{
MessageBox(NULL,
_T("Call to CreateWindow failed!"),
_T("Windows Desktop Guided Tour"),
NULL);
return 1;
}
// Store instance handle in our global variable
hInst = hInstance;
// The parameters to ShowWindow explained:
// hWnd: the value returned from CreateWindow
// nCmdShow: the fourth parameter from WinMain
ShowWindow(hWnd,
nCmdShow);
UpdateWindow(hWnd);
// Main message loop:
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)msg.wParam;
}

Answer 1

why are you defining WinMain and WndProc in your .cpp file. You should not do that instead you have to provide only definition of these functions. Like for WindowsProc
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_LBUTTONDOWN:
//Code
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
You have to delete deceleration of WndProc and WinMain.