<分区>
我正在从“编程 2D 游戏”学习用 C++ 编写游戏代码，我有一个基本的 WinMain 程序，如下所示，但是书中说要使用两个默认标签。但是我的 IDE (VS2013) 告诉我默认标签已经出现在开关中。
是否有解决此问题的方法，还是我在转换中犯了错误？我已经与这本书进行了交叉引用，但是我找不到这方面的任何信息。
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
// Function prototypes
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int);
bool CreateMainWindow(HINSTANCE, int);
LRESULT WINAPI WinProc(HWND, UINT, WPARAM, LPARAM);
// global variable
HINSTANCE hinst;
HDC hdc; // Handle to device context
TCHAR ch = ' '; // Character entered
RECT rect; // Rectangle structure
PAINTSTRUCT ps; // Used in WM_PAINT
// Constants
const char CLASS_NAME[] = "Keyboard";
const char APP_TITLE[] = "Character Input";
const int WINDOW_WIDTH = 400;
const int WINDOW_HEIGHT = 400;
//==================================
// Starting point for the windows application
// Parameters are
// hInstance. Handle to the current instance of the application
// hPrevInstance. Always NULL, obsolete parameter
// lpCmdLine. Pointer to null-terminated string of command arguements
// nCmdShow. Specifies how the window is to be shown
//=================================
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow )
{
MSG msg;
// Create thw window
if (!CreateMainWindow(hInstance, nCmdShow))
return false;
// Main message loop
int done = 0;
while (!done)
{
// PeekMessage is a non blocking message for Windows messages
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
// Look for quit message
if (msg.message == WM_QUIT)
done = 1;
// Decode and pass messages on to WinProc
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return msg.wParam;
}
//==============
// Window event callback function
// ===============================
LRESULT WINAPI WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_DESTROY:
//Tell windows to kill this program
PostQuitMessage(0);
return 0;
case WM_CHAR: // A character was entered by the keyboard
switch (wParam); // The character is in wParam
{
case 0x08: //Backspace
case 0x09: // Tab
case 0x0A: // Linefeed
case 0x0D: // Carriage return
case 0x1B: // Escape
MessageBeep((UINT) -1); // Beep but do not display
return 0;
default: // Displayable character
ch = (TCHAR) wParam; // Get the character
InvalidateRect(hWnd, NULL, TRUE); // Force WM_PAINT
return 0;
}
case WM_PAINT: // The window needs to be redrawn
hdc = BeginPaint(hWnd, &ps); // Get handle to device context
GetClientRect(hWnd, &rect); // Get the window rectangle
// Display the character
TextOut(hdc, rect.right / 2, rect.bottom / 2, &ch, 1);
EndPaint(hWnd, &ps);
return 0;
default:
return DefWindowProc( hWnd, msg, wParam, lParam );
}
}
//===========================================
// Create the window
// Returns: False on error
//===========================================
bool CreateMainWindow(HINSTANCE hInstance, int nCmdShow)
{
WNDCLASSEX wcx;
HWND hwnd;
// Fill in the window class structure with parameters
// That describe the main window
wcx.cbSize = sizeof(wcx); // Size of the structure
wcx.style = CS_HREDRAW | CS_VREDRAW; // Redraw if the size changes
wcx.lpfnWndProc = WinProc; // Points to windows procedure
wcx.cbClsExtra = 0; // No extra class memory
wcx.cbWndExtra = 0; // No extra window memory
wcx.hInstance = hInstance;
wcx.hIcon = NULL;
wcx.hCursor = LoadCursor(NULL, IDC_ARROW); // Predifined arrow
// Background brush
wcx.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wcx.lpszMenuName = NULL; // Name of menu resource
wcx.lpszClassName = CLASS_NAME; // Name of window class
wcx.hIconSm = NULL;
// Register the window class
// RegisterClassEx return 0 on error
if (RegisterClassEx(&wcx) == 0) // if error
return false;
// Create Window
hwnd = CreateWindow(
CLASS_NAME, // Name of window class
APP_TITLE, // Title bar text
WS_OVERLAPPEDWINDOW, // Window style
CW_USEDEFAULT, // Default horizontal postion of window
CW_USEDEFAULT, // Default vertical postion of window
WINDOW_WIDTH, // Width of window
WINDOW_HEIGHT, // Height of window
(HWND) NULL, // No parent window
(HMENU) NULL, // No menu
hInstance, // Handle to application window
(LPVOID) NULL); // No window parameters
// If there was an error the window
if (!hwnd)
return false;
// Show the window
ShowWindow(hwnd, nCmdShow);
// Send a WM_PAINT message to the window procedure
UpdateWindow(hwnd);
return true;
}