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#include<Windows.h>
#include<strsafe.h>

HINSTANCE hinst;
HWND hwndMain;

#define LINES 28

LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
 HDC hdc;
 PAINTSTRUCT ps;
 TEXTMETRIC tm;
 SCROLLINFO si;
 
 static int xClient;
 static int yClient;
 static int xClientMax;

 static int xChar;
 static int yChar;
 static int xUpper;

 static int xPos;
 static int yPos;

 int i;
 int x, y;

 int FirstLine;
 int LastLine;
 HRESULT hr;
 size_t abcLength;

 static TCHAR *abc[] = {
  TEXT("anteater"),  TEXT("bear"),      TEXT("cougar"),
  TEXT("dingo"),     TEXT("elephant"),  TEXT("falcon"),
  TEXT("gazelle"),   TEXT("hyena"),     TEXT("iguana"),
  TEXT("jackal"),    TEXT("kangaroo"),  TEXT("llama"),
  TEXT("moose"),     TEXT("newt"),      TEXT("octopus"),
  TEXT("penguin"),   TEXT("quail"),     TEXT("rat"),
  TEXT("squid"),     TEXT("tortoise"),  TEXT("urus"),
  TEXT("vole"),      TEXT("walrus"),    TEXT("xylophone"),
  TEXT("yak"),       TEXT("zebra"),
  TEXT("This line contains words, but no character. Go figure."),
  TEXT("")
 };

 switch (uMsg)
 {
 case WM_CREATE:
  hdc = GetDC(hwnd);

  GetTextMetrics(hdc, &tm);
  xChar = tm.tmAveCharWidth;
  xUpper = (tm.tmPitchAndFamily & 1 ? 3 : 2) * xChar / 2;
  yChar = tm.tmHeight + tm.tmExternalLeading;

  ReleaseDC(hwnd, hdc);

  xClientMax = 48 * xChar + 12 * xUpper;
  break;

 case WM_SIZE:
  yClient = HIWORD(lParam);
  xClient = LOWORD(lParam);
  
  si.cbSize = sizeof(si);
  si.fMask = SIF_RANGE | SIF_PAGE;
  si.nMin = 0;
  si.nMax = LINES - 1;
  si.nPage = yClient / yChar;
  SetScrollInfo(hwnd, SB_VERT, &si, TRUE);

  si.cbSize = sizeof(si);
  si.fMask = SIF_RANGE | SIF_PAGE;
  si.nMin = 0;
  si.nMax = 2 + xClientMax / xChar;
  si.nPage = xClient / xChar;
  SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
  break;

 case WM_HSCROLL:
  si.cbSize = sizeof(si);
  si.fMask = SIF_ALL;

  GetScrollInfo(hwnd, SB_HORZ, &si);
  xPos = si.nPos;
  switch (LOWORD(wParam))
  {
  case SB_LINELEFT:
   si.nPos -= 1;
   break;

  case SB_LINERIGHT:
   si.nPos += 1;
   break;

  case SB_PAGELEFT:
   si.nPos -= si.nPage;
   break;

  case SB_PAGERIGHT:
   si.nPos += si.nPage;
   break;

  case SB_THUMBTRACK:
   si.nPos = si.nTrackPos;
   break;

  default:
   break;
  }

  si.fMask = SIF_POS;
  SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
  GetScrollInfo(hwnd, SB_HORZ, &si);

  if (si.nPos != xPos) 
  {
   ScrollWindow(hwnd, xChar * (xPos - si.nPos), 0, NULL, NULL);
  }
  break;

 case WM_VSCROLL:
  si.cbSize = sizeof(si);
  si.fMask = SIF_ALL;
  GetScrollInfo(hwnd, SB_VERT, &si);

  yPos = si.nPos;
  switch (LOWORD(wParam))
  {
  case SB_TOP:
   si.nPos = si.nMin;
   break;

  case SB_BOTTOM:
   si.nPos = si.nMax;
   break;

  case SB_LINEUP:
   si.nPos -= 1;
   break;

  case SB_LINEDOWN:
   si.nPos += 1;
   break;

  case SB_PAGEUP:
   si.nPos -= si.nPage;
   break;

  case SB_PAGEDOWN:
   si.nPos += si.nPage;
   break;

  case SB_THUMBTRACK:
   si.nPos = si.nTrackPos;
   break;

  default:
   break;
  }

  si.fMask = SIF_POS;
  SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
  GetScrollInfo(hwnd, SB_VERT, &si);

  if (si.nPos != yPos)
  {
   ScrollWindow(hwnd, 0, yChar * (yPos - si.nPos), NULL, NULL);
   UpdateWindow(hwnd);
  }
  break;

 case WM_PAINT:
  hdc = BeginPaint(hwnd, &ps);

  si.cbSize = sizeof(si);
  si.fMask = SIF_POS;
  GetScrollInfo(hwnd, SB_VERT, &si);
  yPos = si.nPos;

  GetScrollInfo(hwnd, SB_HORZ, &si);
  xPos = si.nPos;

  FirstLine = max(0, yPos + ps.rcPaint.top / yChar);
  LastLine = min(LINES - 1, yPos + ps.rcPaint.bottom / yChar);

  

  x = xChar * (1 - xPos);
  y = yChar * (1 - yPos);
  
  for (i = FirstLine; i <= LastLine; i++)
  {
   //y = yChar * (i - yPos);
   ;
   hr = StringCchLength(abc[i], 64, &abcLength);
   if ((FAILED(hr)) | (abcLength == NULL))
   {
    //Error
   }

   TextOut(hdc, x, y + (i - 1) * yChar, abc[i], abcLength);
  }

  EndPaint(hwnd, &ps);
  break;

 case WM_DESTROY:
  PostQuitMessage(0);
  break;

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

 return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpszCmdLine, int nCmdShow)
{
 MSG msg;
 BOOL bRet;
 WNDCLASS wc;
 UNREFERENCED_PARAMETER(lpszCmdLine);

 static TCHAR lpszAppName[] = TEXT("MyWindows");

 if (!hPrevInstance)
 {
  wc.style = CS_HREDRAW | CS_VREDRAW;
  wc.lpfnWndProc = WndProc;
  wc.cbClsExtra = 0;
  wc.cbWndExtra = 0;
  wc.hInstance = hInstance;
  wc.hIcon = LoadIcon((HINSTANCE)NULL, IDI_APPLICATION);
  wc.hCursor = LoadCursor((HINSTANCE)NULL, IDC_ARROW);
  wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
  wc.lpszMenuName = NULL;
  wc.lpszClassName = lpszAppName;

  if (!RegisterClass(&wc))
   return FALSE;
 }
 
 hinst = hInstance;

 hwndMain = CreateWindow(
  lpszAppName,
  "MainWindow",
  WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  (HWND)NULL,
  (HMENU)NULL,
  hinst,
  (LPVOID)NULL,);

 if (!hwndMain)
  return FALSE;

 ShowWindow(hwndMain, nCmdShow);
 UpdateWindow(hwndMain);

 while ( (bRet = GetMessage( &msg, NULL, 0, 0 )) != 0)
 {
  if (bRet == -1)
  {
   //Error
  }
  else
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
  }
 }

 return msg.wParam;
}

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תÔØÓÚ:https://www.cnblogs.com/eternalmoonbeam/p/10827792.html