windowsTemplate.cpp

#include <windows.h>
#include <string>

#define ID_BUTTON 1

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
HANDLE hwndButton;

void CenterWindow(HWND);
LPWSTR stringToLPWSTR(const std::string& instr);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
        MSG msg;
        WNDCLASSW wc = {0};
        wc.lpszClassName = L"test";
        wc.hInstance = hInstance;
        wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
        wc.lpfnWndProc = WndProc;
        wc.hCursor = LoadCursor(0, IDC_ARROW);
        RegisterClassW(&wc);
        CreateWindowW(wc.lpszClassName, L"Test", WS_OVERLAPPEDWINDOW|WS_VISIBLE, 260, 134, 288, 104, 0, 0, hInstance, 0);
        while(GetMessage(&msg, NULL, 0, 0))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
    case WM_KEYDOWN:
        if (wParam == VK_ESCAPE) {
            int ret = MessageBoxW(hwnd, L"Woot?",
                L"Message", MB_OKCANCEL);
            if (ret == IDOK) {
                SendMessage(hwnd, WM_CLOSE, 0, 0);
            }
        }
        break;
    case WM_CREATE:
        CenterWindow(hwnd);
        hwndButton=CreateWindowW(L"Button", L"Click", WS_VISIBLE|WS_CHILD, 50, 9, 61, 21, hwnd, (HMENU)ID_BUTTON, NULL, NULL);
        break;
    case WM_COMMAND:
        if(LOWORD(wParam)==ID_BUTTON)
        {

        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    }
    return DefWindowProcW(hwnd, msg, wParam, lParam);
}

void CenterWindow(HWND hwnd)
{
    RECT rc = {0};
    GetWindowRect(hwnd, &rc);
    int win_w = rc.right - rc.left;
    int win_h = rc.bottom - rc.top;
    int screen_w = GetSystemMetrics(SM_CXSCREEN);
    int screen_h = GetSystemMetrics(SM_CYSCREEN);
    SetWindowPos(hwnd, HWND_TOP, (screen_w - win_w)/2, (screen_h - win_h)/2, 0, 0, SWP_NOSIZE);
}

LPWSTR stringToLPWSTR(const std::string& instr)
{
    int bufferlen = ::MultiByteToWideChar(CP_ACP, 0, instr.c_str(), instr.size(), NULL, 0);
    LPWSTR widestr = new WCHAR[bufferlen + 1];
    ::MultiByteToWideChar(CP_ACP, 0, instr.c_str(), instr.size(), widestr, bufferlen);
    widestr[bufferlen] = 0;
    return widestr;
}