Windows程序设计—在空白框内实现点击效果

// 3.cpp : 定义应用程序的入口点。
//
#include "framework.h"
#include "3.h"
#define MAX_LOADSTRING 100
// 全局变量:
HINSTANCE hInst;                                // 当前实例
WCHAR szTitle[MAX_LOADSTRING];                  // 标题栏文本
WCHAR szWindowClass[MAX_LOADSTRING];            // 主窗口类名
// 此代码模块中包含的函数的前向声明:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR    lpCmdLine,
_In_ int       nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: 在此处放置代码。
// 初始化全局字符串
LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadStringW(hInstance, IDC_MY3, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// 执行应用程序初始化:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MY3));
MSG msg;
// 主消息循环:
while (GetMessage(&msg, nullptr, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// 函数: MyRegisterClass()
//
// 目标: 注册窗口类。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEXW 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, MAKEINTRESOURCE(IDI_MY3));
wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_MY3);
wcex.lpszClassName  = szWindowClass;
wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassExW(&wcex);
}
//
// 函数: InitInstance(HINSTANCE, int)
//
// 目标: 保存实例句柄并创建主窗口
//
// 注释:
//
// 在此函数中，我们在全局变量中保存实例句柄并
// 创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // 将实例句柄存储在全局变量中
HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// 函数: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// 目标: 处理主窗口的消息。
//
// WM_COMMAND - 处理应用程序菜单
// WM_PAINT - 绘制主窗口
// WM_DESTROY - 发送退出消息并返回
//
//
LRESULT onLButtonDown(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
//MessageBox(hWnd, _T("是否进入"), _T("欢迎来到该界面"), MB_OK);
char* str = (char*)"Hello";
HDC hdc = GetDC(hWnd);
TextOut(hdc, LOWORD(lParam), HIWORD(lParam), str, strlen(str));
return 0;
}
LRESULT onLButtonUp(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
//MessageBox(hWnd, _T("是否进入"), _T("欢迎来到该界面"), MB_OK);
char* str = (char*)"12345";
HDC hdc = GetDC(hWnd);
TextOut(hdc, LOWORD(lParam), HIWORD(lParam), str, strlen(str));
return 0;
}
LRESULT OnCommand(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
int wmId = LOWORD(wParam);
// 分析菜单选择:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
LRESULT OnPaint(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: 在此处添加使用 hdc 的任何绘图代码...
EndPaint(hWnd, &ps);
return 0;
}
LRESULT OnDestroy(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
PostQuitMessage(0);
return 0;
}
struct MSG_ENIRY
{
UINT nMessage;
LRESULT(*pfn)(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
};
struct MSG_ENIRY msgEntry[] = {
WM_LBUTTONDOWN,onLButtonDown,
WM_LBUTTONUP,onLButtonUp,
WM_COMMAND,OnCommand,
WM_PAINT,OnPaint,
WM_DESTROY,OnDestroy,
};
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int nSize = sizeof(msgEntry) / sizeof(msgEntry[0]);
for (int i = 0; i < nSize; i++) {
if (msgEntry[i].nMessage == message) {
(*msgEntry[i].pfn)(hWnd, message, wParam, lParam);
}
}
return DefWindowProc(hWnd, message, wParam, lParam);
/*switch (message) { case WM_LBUTTONDOWN: onLButtonDown(hWnd, message, wParam, lParam); break; case WM_COMMAND: OnCommand(hWnd, message, wParam, lParam); break; case WM_PAINT: OnPaint(hWnd, message, wParam, lParam); break; case WM_DESTROY: OnDestroy(hWnd, message, wParam, lParam); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0;*/
}
// “关于”框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}

代码改进之处：

两种方式改变WndProc函数内部结构。

struct MSG_ENIRY
{
UINT nMessage;
LRESULT(*pfn)(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
};
struct MSG_ENIRY msgEntry[] = {
WM_LBUTTONDOWN,onLButtonDown,
WM_LBUTTONUP,onLButtonUp,
WM_COMMAND,OnCommand,
WM_PAINT,OnPaint,
WM_DESTROY,OnDestroy,
};
int nSize = sizeof(msgEntry) / sizeof(msgEntry[0]);
for (int i = 0; i < nSize; i++) {
if (msgEntry[i].nMessage == message) {
(*msgEntry[i].pfn)(hWnd, message, wParam, lParam);
}
}
return DefWindowProc(hWnd, message, wParam, lParam);

switch (message)
{
case WM_LBUTTONDOWN:
onLButtonDown(hWnd, message, wParam, lParam);
break;
case WM_COMMAND:
OnCommand(hWnd, message, wParam, lParam);
break;
case WM_PAINT:
OnPaint(hWnd, message, wParam, lParam);
break;
case WM_DESTROY:
OnDestroy(hWnd, message, wParam, lParam);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

采用调用内部函数的方式，将内部函数放到外面去。

LRESULT onLButtonDown(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
//MessageBox(hWnd, _T("是否进入"), _T("欢迎来到该界面"), MB_OK);
char* str = (char*)"Hello";
HDC hdc = GetDC(hWnd);
TextOut(hdc, LOWORD(lParam), HIWORD(lParam), str, strlen(str));
return 0;
}
LRESULT onLButtonUp(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
//MessageBox(hWnd, _T("是否进入"), _T("欢迎来到该界面"), MB_OK);
char* str = (char*)"12345";
HDC hdc = GetDC(hWnd);
TextOut(hdc, LOWORD(lParam), HIWORD(lParam), str, strlen(str));
return 0;
}
LRESULT OnCommand(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
int wmId = LOWORD(wParam);
// 分析菜单选择:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
LRESULT OnPaint(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: 在此处添加使用 hdc 的任何绘图代码...
EndPaint(hWnd, &ps);
return 0;
}
LRESULT OnDestroy(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
PostQuitMessage(0);
return 0;
}

重点是？

LRESULT onLButtonDown(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
//MessageBox(hWnd, _T("是否进入"), _T("欢迎来到该界面"), MB_OK);
char* str = (char*)"Hello";
HDC hdc = GetDC(hWnd);
TextOut(hdc, LOWORD(lParam), HIWORD(lParam), str, strlen(str));
return 0;
}

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