cdrapp/icon/cpg_icon02.cpp

#include <windows.h>

#define BUTTON_SIZE 40
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

// `shell32.dll` 中图标的索引
int iconIndexes[16] = {4,  5,  7,  10, 14, 16, 18, 21,
                       23, 27, 31, 35, 39, 43, 45, 60};

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow) {
  // 注册窗口类
  const char CLASS_NAME[] = "SimpleWindowClass";

  WNDCLASS wc = {};
  wc.lpfnWndProc = WindowProc;
  wc.hInstance = hInstance;
  wc.lpszClassName = CLASS_NAME;
  wc.hCursor = LoadCursor(NULL, IDC_ARROW);

  RegisterClass(&wc);

  // 窗口宽度和高度
  int w = 320;
  int h = 80;
  // 计算窗口显示位置
  int x = (GetSystemMetrics(SM_CXSCREEN) - w) / 2;
  int y = (GetSystemMetrics(SM_CYSCREEN) - h) / 2;

  // 创建窗口
  HWND hwnd =
      CreateWindowEx(WS_EX_TOPMOST, CLASS_NAME, "", WS_POPUP | WS_VISIBLE, x, y,
                     w, h, NULL, NULL, hInstance, NULL);

  if (!hwnd) {
    return 0;
  }

  // 显示窗口
  ShowWindow(hwnd, nCmdShow);

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

  return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam,
                            LPARAM lParam) {
  switch (uMsg) {
  case WM_CREATE: {
    // 获取 shell32.dll 的路径
    char shell32Path[MAX_PATH];
    GetSystemDirectory(shell32Path, MAX_PATH);
    strcat(shell32Path, "\\shell32.dll");

    // 创建16个按钮并加载不同图标
    for (int i = 0; i < 16; ++i) {
      int x = (i % 8) * BUTTON_SIZE;
      int y = (i / 8) * BUTTON_SIZE;

      HWND hButton = CreateWindow(
          "BUTTON", "", WS_CHILD | WS_VISIBLE | BS_ICON, x, y, BUTTON_SIZE,
          BUTTON_SIZE, hwnd, (HMENU)(1000 + i), GetModuleHandle(NULL), NULL);

      // 使用 ExtractIcon 从 shell32.dll 中提取图标
      HICON hIcon =
          ExtractIcon(GetModuleHandle(NULL), shell32Path, iconIndexes[i]);
      SendMessage(hButton, BM_SETIMAGE, IMAGE_ICON, (LPARAM)hIcon);
    }
    return 0;
  }
  case WM_DESTROY:
    PostQuitMessage(0);
    return 0;
  }

  return DefWindowProc(hwnd, uMsg, wParam, lParam);
}