sdk Windows编程中 hInstance = ((LPCREATESTRUCT) lParam)->hInstance;

lParam是操作系统调用你的窗口过程传给你的参数 他根据处理消息的不同含义也会不同

当在处理WM_CREATE消息时 lParam里面保存的是一指针既LPCREATESTRUCT结构的地址 其中有一个域名为hInstance

((LPCREATESTRUCT) lParam)->hInstance 就是通过保存在lParam里面的地址取出LPCREATESTRUCT结构里面的hInstance 既程序的实例句柄

typedef struct tagCREATESTRUCT {
    LPVOID lpCreateParams;
    HINSTANCE hInstance;
    HMENU hMenu;
    HWND hwndParent;
    int cy;
    int cx;
    int y;
    int x;
    LONG style;
    LPCTSTR lpszName;
    LPCTSTR lpszClass;
    DWORD dwExStyle;
} CREATESTRUCT, *LPCREATESTRUCT;

我希望这个程序没有最小化、最大化、关闭按钮,并且输入框可以输入的字符数量可以输入2000个支持换行 #include <windows.h> #define ID_EDIT 101 #define ID_BUTTON 102 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT("MyWindow"); HWND hwnd; MSG msg; WNDCLASS wndclass; wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wndclass.lpszMenuName = NULL; wndclass.lpszClassName = szAppName; if (!RegisterClass(&wndclass)) { MessageBox(NULL, TEXT("注册窗口类失败!"), TEXT("错误"), MB_ICONERROR); return 0; } // 计算窗口尺寸 RECT rect = {0, 0, 1024, 512}; AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE); hwnd = CreateWindow(szAppName, TEXT("Win32 GUI程序"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, hInstance, NULL); ShowWindow(hwnd, iCmdShow); UpdateWindow(hwnd); while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static HWND hEdit, hButton; switch (message) { case WM_CREATE: { // 创建输入框 hEdit = CreateWindow(TEXT("EDIT"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOVSCROLL, 200, 200, 600, 30, hwnd, (HMENU)ID_EDIT, ((LPCREATESTRUCT)lParam)->hInstance, NULL); // 创建按钮 hButton = CreateWindow(TEXT("BUTTON"), TEXT("提交"), WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 400, 250, 200, 40, hwnd, (HMENU)ID_BUTTON, ((LPCREATESTRUCT)lParam)->hInstance, NULL); return 0; } case WM_COMMAND: { if (LOWORD(wParam) == ID_BUTTON) { TCHAR szText[256]; GetWindowText(hEdit, szText, 256); MessageBox(hwnd, szText, TEXT("输入内容"), MB_OK); } return 0; } case WM_PAINT: { PAINTSTRUCT ps; HDC hdc = BeginPaint(hwnd, &ps); // 设置背景颜色 RGB(108,97,245) HBRUSH hBrush = CreateSolidBrush(RGB(108, 97, 245)); FillRect(hdc, &ps.rcPaint, hBrush); DeleteObject(hBrush); EndPaint(hwnd, &ps); return 0; } case WM_DESTROY: { PostQuitMessage(0); return 0; } } return DefWindowProc(hwnd, message, wParam, lParam); }
04-02
#include <windows.h> #include <tchar.h> #include <stdio.h> // 假设的农历转换函数,需要自己实现 const TCHAR* GetLunarDate(int year, int month, int day) { // 这里仅返回空字符串,实际应返回农历字符串 return _T(""); } // 全局变量存储当前显示的年月 int g_nYear = 2023, g_nMonth = 10; // 窗口过程函数 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; TCHAR szBuffer[100]; RECT rect; switch (message) { case WM_CREATE: // 创建按钮:上个月、下个月 CreateWindow(_T("BUTTON"), _T("上个月"), WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON, 10, 10, 80, 25, hWnd, (HMENU)1001, ((LPCREATESTRUCT)lParam)->hInstance, NULL); CreateWindow(_T("BUTTON"), _T("下个月"), WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON, 100, 10, 80, 25, hWnd, (HMENU)1002, ((LPCREATESTRUCT)lParam)->hInstance, NULL); break; case WM_COMMAND: if (LOWORD(wParam) == 1001) { // 上个月 g_nMonth--; if (g_nMonth < 1) { g_nMonth = 12; g_nYear--; } InvalidateRect(hWnd, NULL, TRUE); // 重绘窗口 } else if (LOWORD(wParam) == 1002) { // 下个月 g_nMonth++; if (g_nMonth > 12) { g_nMonth = 1; g_nYear++; } InvalidateRect(hWnd, NULL, TRUE); } break; case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // 显示当前年月 _stprintf_s(szBuffer, _T("%d年%d月"), g_nYear, g_nMonth); TextOut(hdc, 200, 10, szBuffer, _tcslen(szBuffer)); // 这里添加绘制日历的代码,包括公历和农历 // 需要计算当前月的第一天是星期几,然后按网格绘制每一天 // 并调用GetLunarDate获取农历显示 EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { // 初始化全局变量:获取当前年月 SYSTEMTIME st; GetLocalTime(&st); g_nYear = st.wYear; g_nMonth = st.wMonth; 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 = _T("CalendarApp"); wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION); if (!RegisterClassEx(&wcex)) { MessageBox(NULL, _T("窗口注册失败!"), _T("错误"), MB_ICONERROR); return 1; } HWND hWnd = CreateWindow( _T("CalendarApp"), _T("万年历"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL); if (!hWnd) { MessageBox(NULL, _T("窗口创建失败!"), _T("错误"), MB_ICONERROR); return 1; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); MSG msg; while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return (int)msg.wParam; } 每行注释
最新发布
07-20
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