Win32API C语言 InputBox输入框实现

#define ID_INPUTEDIT 1001
#define ID_OK 1002

BOOL closing = FALSE;
HWND dialogHandle = 0;

LRESULT CALLBACK inputBoxWndProc(HWND wndHandle, UINT message, WPARAM wParam, LPARAM lParam)
{    
    static char **result = 0;
    static HWND inputHandle = 0;    
    
    switch (message)
    {
    case WM_NCCREATE:
        result = ((CREATESTRUCT *)lParam)->lpCreateParams;        
        break;
    
    case WM_CLOSE:
    case WM_DESTROY:
        closing = TRUE;
        dialogHandle = 0;
        PostQuitMessage(0);
        break;
    
    case WM_COMMAND:    
        int notifyCode = HIWORD(wParam);    
        int controlId = LOWORD(wParam);    
        HWND controlHandle = (HWND)lParam;
        
        switch (controlId)
        {
        case ID_INPUTEDIT:
            inputHandle = controlHandle;
            
            if (notifyCode == EN_UPDATE)
            {
                if (*result == 0)
                    *result = malloc(256);
                GetWindowText(inputHandle, *result, 256);
                PostQuitMessage(0);
            }
            break;
            
        case ID_OK:
            SendMessage(wndHandle, WM_CLOSE, 0, 0);
            break;
        }
        break;
    }
    
    return DefWindowProc(wndHandle, message, wParam, lParam);
}

WNDCLASS wndClass; // 全局变量自动清0

void inputbox_init(void)
{
    wndClass.hCursor = LoadCursor(0, IDC_ARROW);
//    WndClass.hIcon = LoadIcon(0, IDI_APPLICATION);
//    wndClass.cbSize = sizeof wndClass;
    wndClass.style = CS_HREDRAW | CS_VREDRAW;
    wndClass.lpfnWndProc = inputBoxWndProc;
    wndClass.hbrBackground = (HBRUSH)COLOR_WINDOWFRAME;
    wndClass.lpszClassName = "InputBox";
    wndClass.hInstance = GetModuleHandle(0);

    RegisterClass(&wndClass);
}

HWND dialog_init(char *hint, char **result)
{
#define X 5
#define OKBUTTON_WIDTH 75
#define INPUTEDIT_WIDTH (width0 - OKBUTTON_WIDTH)
#define INPUTEDIT_Y 29
#define HINT_HEIGHT 24
#define CHAR_WIDTH 8
    HWND dialogHandle, inputLabelHandle, inputHandle, okButtonHandle;
    
    int hint_width = strlen(hint) * CHAR_WIDTH,
        width0 = hint_width + OKBUTTON_WIDTH,
        height = HINT_HEIGHT + INPUTEDIT_Y + 50;
    
    dialogHandle = CreateWindow(
        wndClass.lpszClassName, "文本输入框的标题", WS_OVERLAPPEDWINDOW,
        100, 100, width0 + 50, height,
        0, 0, wndClass.hInstance, result);

    inputLabelHandle = CreateWindow(
        "STATIC", hint, WS_CHILD | WS_VISIBLE,
        X, 5, hint_width, HINT_HEIGHT,
        dialogHandle, 0, wndClass.hInstance, 0);

    inputHandle = CreateWindow(
        "EDIT", "", WS_BORDER | WS_CHILD | WS_VISIBLE,
        X, INPUTEDIT_Y, INPUTEDIT_WIDTH, 24,
        dialogHandle, (HMENU)ID_INPUTEDIT, wndClass.hInstance, 0);

    okButtonHandle = CreateWindow(
        "BUTTON", "确定按钮", WS_CHILD | WS_VISIBLE,
        X + INPUTEDIT_WIDTH + 5, INPUTEDIT_Y, OKBUTTON_WIDTH, 24,
        dialogHandle, (HMENU)ID_OK, wndClass.hInstance, 0);
    
    return dialogHandle;
}

char *inputbox(char *hint)
{
    static char *result = 0;
    MSG msg;
    
    if (dialogHandle == 0)
    {
        dialogHandle = dialog_init(hint, &result);
        
        if (dialogHandle == 0)
            return 0;
    }
 
    // 在桌面显示窗口
    ShowWindow(dialogHandle, SW_SHOWNORMAL);
 
    // 刷新窗口客户区
    // UpdateWindow(dialogHandle);
 
    while (GetMessage(&msg, 0, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
 
    return result;
}