我又又又又又又更新了~~纯手工编写C++画图，有注释~~~

再再再次感谢Ttcofee提的问题

        本次更新内容：

                  鼠标图案（切换），版本号获取，输入框复制剪切板

提前申明：如果运行不了，请到主页查看RedpandaDevc++下载，若还是不行就卸了重装。

版本号：1.9.25

460行

//版本号 :v1.9.25
//最终归属权为作者(饼干帅成渣)所有
//禁止转载
//仅供学习，不得用于违法
#include <windows.h>
#include <gdiplus.h>
#include <string>
#include <iostream>
// 控件和消息定义
#define IDC_EDIT_INPUT  109
#define IDC_BTN_COPY    108
#define IDC_STATIC_TIME 1007
#define IDC_EDIT_PWD   1001
#define IDC_BTN_TOGGLE 1002
#define IDC_EDIT1        1003
#define IDC_BUTTON_SUBMIT 1004
#define IDC_BTN_TRAY    1005
#define WM_TRAY_ICON    1006
using namespace std;
// 定义光标切换的状态
enum CursorState {
    ARROW,
    HAND,
    CROSS
};
CursorState currentCursor = CROSS;
HWND g_hwnd;
HWND hhwwnndd;
NOTIFYICONDATA g_nid = {0};
bool g_isInTray = false;
HWND hEdit;
HWND hButton, hButton2;
POINT g_startPos, g_endPos;
RECT g_originalRect;
LONG_PTR g_originalStyle;
bool g_isFullscreen = false;
HBITMAP g_hMemBitmap = NULL;
HDC g_hMemDC = NULL;
int g_width = 0, g_height = 0;
bool g_isPasswordMode = true; // 初始为密码模式

void InitTrayIcon(HWND hwnd) {
	g_nid.cbSize = sizeof(NOTIFYICONDATA);
	g_nid.hWnd = hwnd;
	g_nid.uID = 1;
	g_nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
	g_nid.uCallbackMessage = WM_TRAY_ICON;
	g_nid.hIcon = LoadIcon(NULL, IDI_APPLICATION);
}

// 切换托盘状态
void ToggleTrayMode(HWND hwnd) {
	if (!g_isInTray) {
		// 最小化到托盘
		ShowWindow(hwnd, SW_HIDE);
		Shell_NotifyIcon(NIM_ADD, &g_nid);
	} else {
		// 恢复窗口
		ShowWindow(hwnd, SW_SHOW);
		Shell_NotifyIcon(NIM_DELETE, &g_nid);
	}
	g_isInTray = !g_isInTray;
}

// 初始化双缓冲
void InitDoubleBuffer(HWND hwnd) {
	RECT rc;
	GetClientRect(hwnd, &rc);
	g_width = rc.right - rc.left;
	g_height = rc.bottom - rc.top;
	HDC hdc = GetDC(hwnd);
	g_hMemDC = CreateCompatibleDC(hdc);
	g_hMemBitmap = CreateCompatibleBitmap(hdc, g_width, g_height);
	SelectObject(g_hMemDC, g_hMemBitmap);
	ReleaseDC(hwnd, hdc);
	// 初始清屏（可选）
	FillRect(g_hMemDC, &rc, (HBRUSH)GetStockObject(WHITE_BRUSH));
}
// 切换全屏函数
void ToggleFullscreen(HWND hwnd) {
	if (!g_isFullscreen) {
		// 进入全屏
		GetWindowRect(hwnd, &g_originalRect);
		g_originalStyle = GetWindowLongPtr(hwnd, GWL_STYLE);
		int screenWidth = GetSystemMetrics(SM_CXSCREEN);
		int screenHeight = GetSystemMetrics(SM_CYSCREEN);

		SetWindowLongPtr(hwnd, GWL_STYLE, WS_POPUP);
		SetWindowPos(hwnd, HWND_TOP,
		             0, 0, screenWidth, screenHeight,
		             SWP_FRAMECHANGED | SWP_SHOWWINDOW
		            );
	} else {
		// 退出全屏
		SetWindowLongPtr(hwnd, GWL_STYLE, g_originalStyle);
		SetWindowPos(hwnd, NULL,
		             g_originalRect.left,
		             g_originalRect.top,
		             g_originalRect.right - g_originalRect.left,
		             g_originalRect.bottom - g_originalRect.top,
		             SWP_FRAMECHANGED | SWP_NOZORDER
		            );
	}
	g_isFullscreen = !g_isFullscreen;
}

// 切换密码显示模式
void TogglePasswordMode(HWND hwnd) {
	// 保存当前文本
	wchar_t szText[256] = {0};
	GetWindowTextW(hEdit, szText, 256);

	// 获取当前窗口位置
	RECT rc;
	GetWindowRect(hEdit, &rc);
	MapWindowPoints(HWND_DESKTOP, GetParent(hEdit), (LPPOINT)&rc, 2);

	// 销毁旧编辑框
	DestroyWindow(hEdit);

	// 创建新编辑框（切换样式）
	DWORD style = WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL;
	if (g_isPasswordMode) {
		style |= ES_PASSWORD;
	}

	hEdit = CreateWindowW(
	            L"EDIT", szText,
	            style,
	            rc.left, rc.top,
	            rc.right - rc.left,
	            rc.bottom - rc.top,
	            hwnd, (HMENU)IDC_EDIT_PWD,
	            NULL,
	            NULL
	        );

	// 更新模式状态
	g_isPasswordMode = !g_isPasswordMode;

	// 更新按钮文本
	SetWindowTextW(GetDlgItem(hwnd, IDC_BTN_TOGGLE),
	               g_isPasswordMode ? L"隐藏密码" : L"显示明文");
}

// 窗口过程函数
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
	static HWND hStaticTime; // 静态文本控件句柄
	switch (msg) {
		case WM_SETCURSOR:
            if (LOWORD(lParam) == HTCLIENT) {
                HCURSOR hCursor = NULL;
                switch (currentCursor) {
                    case ARROW:
                        hCursor = LoadCursor(NULL, IDC_CROSS);
                        break;
                    case HAND:
                        hCursor = LoadCursor(NULL, IDC_ARROW);
                        break;
                    case CROSS:
                        hCursor = LoadCursor(NULL,IDC_HAND );
                        break;
                }
                SetCursor(hCursor);
                return TRUE;
            }
        	return TRUE;
            break;
		case WM_SIZE:
			// 窗口大小变化时重置缓冲
			if (g_hMemDC) {
				DeleteDC(g_hMemDC);
				DeleteObject(g_hMemBitmap);
			}
			InitDoubleBuffer(hwnd);
			break;
		case WM_KEYDOWN:
			if (wParam == VK_BACK) { // 按Backspace切换全屏
				ToggleFullscreen(hwnd);
			} else if (wParam == VK_CONTROL) {
				DestroyWindow(hwnd);
				HWND hwnwd;
				hwnwd = FindWindow("ConsoleWindowClass", NULL);
				if (hwnwd) {
					ShowOwnedPopups(hwnwd, SW_SHOW);
					ShowWindow(hwnwd, SW_SHOW);
				}
			}
			return 0;
		case WM_PAINT: { // 窗口需要绘制时触发
			PAINTSTRUCT ps;
			HDC hdc = BeginPaint(hwnd, &ps);  // 获取设备上下文
			// 设置背景模式为透明
			BitBlt(hdc, 0, 0, g_width, g_height, g_hMemDC, 0, 0, SRCCOPY);
			SetBkMode(hdc, TRANSPARENT);
			HPEN hDashPen = CreatePen(PS_DASH, 1, RGB(256, 256, 256));
			SelectObject(hdc, hDashPen);
			MoveToEx(hdc, g_startPos.x, g_startPos.y, NULL);
			LineTo(hdc, g_endPos.x, g_endPos.y);
			return 0;
		}
		case WM_CLOSE:
			// 清理托盘图标
			if (g_isInTray) Shell_NotifyIcon(NIM_DELETE, &g_nid);
			DestroyWindow(hwnd);
			break;
		case WM_DESTROY:
			KillTimer(hwnd, 1); // 销毁定时器
			PostQuitMessage(0);
			return 0;
			break;
		// 处理鼠标消息
		case WM_LBUTTONDOWN:
			g_startPos.x = LOWORD(lParam);
			g_startPos.y = HIWORD(lParam);
			return 0;

		case WM_MOUSEMOVE:
			if (wParam & MK_LBUTTON) {
				g_endPos.x = LOWORD(lParam);
				g_endPos.y = HIWORD(lParam);
				InvalidateRect(hwnd, NULL, TRUE);
			}
			return 0;
		case WM_ERASEBKGND:
			return 1; // 禁用背景擦除
		case WM_CREATE: {
			// 创建获取时间
			hhwwnndd = CreateWindowW(
			               L"BUTTON", L"获取系统时间",
			               WS_CHILD | WS_VISIBLE | SS_CENTER,
			               20, 350, 150, 30,
			               hwnd, (HMENU)12345,
			               NULL, NULL
			           );
			// 创建按钮
			CreateWindowW(L"BUTTON", L"最小化到托盘",
			              WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
			              400, 50, 150, 30, hwnd,
			              (HMENU)IDC_BTN_TRAY, NULL, NULL);
    	    // 创建按钮
		    CreateWindow("BUTTON", "切换光标", WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
		                 20, 450, 100, 30, hwnd, (HMENU)32, NULL, NULL);
			// 初始化托盘
			InitTrayIcon(hwnd);
			// 创建按钮
			hButton = CreateWindow(
			              "BUTTON",                     // 窗口类（按钮）
			              "点击我关闭",                     // 按钮文本
			              WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, // 样式
			              50, 50,                       // 位置 (x, y)
			              100, 30,                       // 大小 (宽度, 高度)
			              hwnd,                         // 父窗口句柄
			              (HMENU)1,                     // 控件ID
			              ((LPCREATESTRUCT)lParam)->hInstance, // 实例句柄
			              NULL                          // 附加数据
			          );
			CreateWindow(
				"BUTTON",                     // 窗口类（按钮）
				"版本号",                     // 按钮文本
				WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, // 样式
				10, 10,                       // 位置 (x, y)
				100, 30,                       // 大小 (宽度, 高度)
				hwnd,                         // 父窗口句柄
				(HMENU)15423,                     // 控件ID
				((LPCREATESTRUCT)lParam)->hInstance, // 实例句柄
				NULL                          // 附加数据
			);
			hButton2 = CreateWindow(
			               "BUTTON",                     // 窗口类（按钮）
			               "点击我切换全屏",                     // 按钮文本
			               WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, // 样式
			               850, 50,                       // 位置 (x, y)
			               100, 30,                       // 大小 (宽度, 高度)
			               hwnd,                         // 父窗口句柄
			               (HMENU)2,                     // 控件ID
			               ((LPCREATESTRUCT)lParam)->hInstance, // 实例句柄
			               NULL                          // 附加数据
			           );

			// 创建切换按钮
			CreateWindowW(
			    L"BUTTON", L"隐藏密码",
			    WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
			    100, 300, 80, 30,
			    hwnd, (HMENU)IDC_BTN_TOGGLE,
			    NULL, NULL
			);
			hEdit = CreateWindowW(L"EDIT", L"",
			                      WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL,
			                      20, 250, 200, 25, hwnd,  (HMENU)IDC_EDIT1, NULL, NULL);

			CreateWindowW(L"BUTTON", L"示例输入",
			              WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
			              20, 300, 80, 30, hwnd, (HMENU)IDC_BUTTON_SUBMIT, NULL, NULL);
            // 创建复制按钮
            CreateWindowW(
                L"BUTTON", L"复制",
                WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
                180, 300, 80, 30,
                hwnd, (HMENU)IDC_BTN_COPY,
                NULL, NULL
            );
			return 0;
		}
		case WM_TRAY_ICON:
			if (lParam == WM_LBUTTONDBLCLK) {
				ToggleTrayMode(hwnd);
			}
			return 0;
		// 禁用系统最小化操作
		case WM_SYSCOMMAND:
			if (wParam == SC_MINIMIZE) {
				ToggleTrayMode(hwnd);
				return 0;
			}
			break;
		case WM_COMMAND: {
            if (LOWORD(wParam) == IDC_BTN_COPY) {
                // 获取输入框内容
                wchar_t szText[256];
                GetWindowTextW(hEdit, szText, 256);

                // 打开剪贴板
                if (OpenClipboard(hwnd)) {
                    // 清空剪贴板
                    EmptyClipboard();

                    // 分配全局内存
                    HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, (wcslen(szText) + 1) * sizeof(wchar_t));
                    if (hGlobal) {
                        // 锁定内存并复制数据
                        wchar_t* pGlobal = (wchar_t*)GlobalLock(hGlobal);
                        wcscpy(pGlobal,  szText);
                        GlobalUnlock(hGlobal);

                        // 设置剪贴板数据
                        SetClipboardData(CF_UNICODETEXT, hGlobal);
                    }

                    // 关闭剪贴板
                    CloseClipboard();
                }

                // 提示用户
                MessageBoxW(hwnd, L"内容已复制到剪贴板！", L"成功", MB_OK);
            }
            // 假设按钮的ID是IDC_BUTTON1
            if (LOWORD(wParam) == 32) {
                if(currentCursor==CROSS){
					currentCursor=HAND;
				}else if(currentCursor==HAND){
					currentCursor=ARROW;
				}else{
					currentCursor=CROSS;
				}
                // 强制更新光标
                PostMessage(hwnd, WM_SETCURSOR, (WPARAM)hwnd, HTCLIENT);
            }
			if (wParam == 12345) { //ID为12345
                // 获取本地时间
                SYSTEMTIME st;
                GetLocalTime(&st);

                // 格式化时间字符串
                wchar_t timeStr[64];
                _snwprintf(timeStr, 64,
                    L"%04d-%02d-%02d %02d:%02d:%02d",
                    st.wYear, st.wMonth, st.wDay,
                    st.wHour, st.wMinute, st.wSecond);

//                // 更新静态文本
//                SetWindowTextW(hStaticTime, timeStr);

//                 可选：弹出消息框显示
                 MessageBoxW(hwnd, timeStr, L"系统时间", MB_OK);
			}
			if (LOWORD(wParam) == IDC_BTN_TRAY) {
				ToggleTrayMode(hwnd);
			}
			if (LOWORD(wParam) == IDC_BUTTON_SUBMIT) {
				wchar_t buffer[256];
				GetWindowTextW(hEdit, buffer, 256);

				if (wcslen(buffer) == 0) {
					MessageBoxW(hwnd, L"输入不能为空！", L"错误", MB_ICONERROR);
				} else {
					MessageBoxW(hwnd, buffer, L"输入内容", MB_OK);
				}
			}
			if (LOWORD(wParam) == IDC_BTN_TOGGLE) {
				TogglePasswordMode(hwnd);
			}			
			if (LOWORD(wParam) == 15423) {
				MessageBoxW(hwnd, L"v1.9.25", L"版本号", MB_OK);				
			}

			int ButtonID = LOWORD(wParam);
			switch (ButtonID) {
				case 1:
					DestroyWindow(hwnd);
					HWND hwnwd;
					hwnwd = FindWindow("ConsoleWindowClass", NULL);
					if (hwnwd) {
						ShowOwnedPopups(hwnwd, SW_SHOW);
						ShowWindow(hwnwd, SW_SHOW);
					}
					break;
				case 2:
					ToggleFullscreen(hwnd);
					break;
			}
		}
		default:
			return DefWindowProc(hwnd, msg, wParam, lParam);
	}
	return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR pCmdLine, int nCmdShow) {
	HWND hwnwd;
	hwnwd = FindWindow("ConsoleWindowClass", NULL);
	if (hwnwd) {
		ShowOwnedPopups(hwnwd, SW_HIDE);
		ShowWindow(hwnwd, SW_HIDE);
	}
	const char* CLASS_NAME = "CustomWindowClass";

	WNDCLASS wc = {};
	wc.lpfnWndProc = WndProc;
	wc.hInstance = hInstance;
	wc.lpszClassName = TEXT(CLASS_NAME);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

	if (!RegisterClass(&wc)) return 0;

	// 创建窗口
	HWND hwnd = CreateWindowEx(
	                0,                              // 扩展样式
	                TEXT(CLASS_NAME),                     // 窗口类
	                " 绘画",                   // 窗口标题
	                WS_OVERLAPPEDWINDOW | WS_VISIBLE, // 窗口样式
	                CW_USEDEFAULT, CW_USEDEFAULT,   // 位置
	                1000, 1000,                       // 大小
	                NULL,                           // 父窗口
	                NULL,                           // 菜单
	                hInstance,                      // 实例句柄
	                NULL                            // 附加数据
	            );

	if (!hwnd) return 0;

	// 消息循环
	MSG msg = {};
	while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return 0;
}

 当然，还有彩蛋

#include <windows.h>

// 控件ID定义
#define IDC_EDIT_INPUT  1001
#define IDC_BTN_COPY    1002

// 窗口过程
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    static HWND hEditInput;

    switch (msg) {
        case WM_CREATE: {
            // 创建输入框
            hEditInput = CreateWindowW(
                L"EDIT", L"",
                WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL,
                20, 20, 200, 25,
                hwnd, (HMENU)IDC_EDIT_INPUT,
                ((LPCREATESTRUCT)lParam)->hInstance,
                NULL
            );

            // 创建复制按钮
            CreateWindowW(
                L"BUTTON", L"复制",
                WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
                230, 20, 80, 25,
                hwnd, (HMENU)IDC_BTN_COPY,
                NULL, NULL
            );
            return 0;
        }

        case WM_COMMAND: {
            if (LOWORD(wParam) == IDC_BTN_COPY) {
                // 获取输入框内容
                wchar_t szText[256];
                GetWindowTextW(hEditInput, szText, 256);

                // 打开剪贴板
                if (OpenClipboard(hwnd)) {
                    // 清空剪贴板
                    EmptyClipboard();

                    // 分配全局内存
                    HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, (wcslen(szText) + 1) * sizeof(wchar_t));
                    if (hGlobal) {
                        // 锁定内存并复制数据
                        wchar_t* pGlobal = (wchar_t*)GlobalLock(hGlobal);
                        wcscpy(pGlobal,szText);
                        GlobalUnlock(hGlobal);

                        // 设置剪贴板数据
                        SetClipboardData(CF_UNICODETEXT, hGlobal);
                    }

                    // 关闭剪贴板
                    CloseClipboard();
                }

                // 提示用户
                MessageBoxW(hwnd, L"内容已复制到剪贴板！", L"成功", MB_OK);
            }
            return 0;
        }

        case WM_CLOSE:
            DestroyWindow(hwnd);
            return 0;

        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;

        default:
            return DefWindowProcW(hwnd, msg, wParam, lParam);
    }
}

// WinMain函数
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int nCmdShow) {
    const wchar_t CLASS_NAME[] = L"CopyToClipboardApp";

    WNDCLASSW wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    RegisterClassW(&wc);

    HWND hwnd = CreateWindowExW(
        0, CLASS_NAME, L"复制到剪贴板示例",
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
        400, 150, NULL, NULL, hInstance, NULL
    );

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    MSG msg;
    while (GetMessageW(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }

    return 0;
}

OK，今天就到这里

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参考：https://blog.csdn.net/lijiale20150909/article/details/146120963