VC中使用滚动条拖拽失败，解决不了？

“使用SetScrollBarInfo()新函数吧”
在VC98和VC2005中都没有找到此函数！
请问如何使用，给个例子吧！

应该是SetScrollInfo()和GetScrollInfo()Example: form MSDN
HDC hdc;
PAINTSTRUCT ps;
TEXTMETRIC tm;
SCROLLINFO si;

// These variables are required to display text.
static int xClient;     // width of client area
static int yClient;     // height of client area
static int xClientMax;  // maximum width of client area

static int xChar;       // horizontal scrolling unit
static int yChar;       // vertical scrolling unit
static int xUpper;      // average width of uppercase letters

static int xPos;        // current horizontal scrolling position
static int yPos;        // current vertical scrolling position

int i;                  // loop counter
int x, y;               // horizontal and vertical coordinates

int FirstLine;          // first line in the invalidated area
int LastLine;           // last line in the invalidated area

// Create an array of lines to display.
#define LINES 28
static TCHAR *abc[] = {
       TEXT("anteater"),  TEXT("bear"),      TEXT("cougar"),
       TEXT("dingo"),     TEXT("elephant"),  TEXT("frog"),
       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 :
        // Get the handle to the client area's device context.
        hdc = GetDC (hwnd);

        // Extract font dimensions from the text metrics.
        GetTextMetrics (hdc, &tm);
        xChar = tm.tmAveCharWidth;
        xUpper = (tm.tmPitchAndFamily & 1 ? 3 : 2) * xChar/2;
        yChar = tm.tmHeight + tm.tmExternalLeading;

        // Free the device context.
        ReleaseDC (hwnd, hdc);

        // Set an arbitrary maximum width for client area.
        // (xClientMax is the sum of the widths of 48 average
        // lowercase letters and 12 uppercase letters.)
        xClientMax = 48 * xChar + 12 * xUpper;

        return 0;

    case WM_SIZE:

        // Retrieve the dimensions of the client area.
        yClient = HIWORD (lParam);
        xClient = LOWORD (lParam);

        // Set the vertical scrolling range and page size
        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);

        // Set the horizontal scrolling range and page size.
        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);

        return 0;     case WM_HSCROLL:
         // Get all the vertial scroll bar information
         si.cbSize = sizeof (si);
         si.fMask  = SIF_ALL;         // Save the position for comparison later on
         GetScrollInfo (hwnd, SB_HORZ, &si);
         xPos = si.nPos;         switch (LOWORD (wParam))
         {
         // user clicked left arrow
         case SB_LINELEFT:
              si.nPos -= 1;
              break;

         // user clicked right arrow
         case SB_LINERIGHT:
              si.nPos += 1;
              break;

         // user clicked shaft left of the scroll box
         case SB_PAGELEFT:
              si.nPos -= si.nPage;
              break;

         // user clicked shaft right of the scroll box
         case SB_PAGERIGHT:
              si.nPos += si.nPage;
              break;

         // user dragged the scroll box
         case SB_THUMBTRACK:
              si.nPos = si.nTrackPos;
              break;

         default :
              break;
         }         // Set the position and then retrieve it.  Due to adjustments
         //   by Windows it may not be the same as the value set.
         si.fMask = SIF_POS;
         SetScrollInfo (hwnd, SB_HORZ, &si, TRUE);
         GetScrollInfo (hwnd, SB_HORZ, &si);

         // If the position has changed, scroll the window
         if (si.nPos != xPos)
         {
          ScrollWindow(hwnd, xChar * (xPos - si.nPos), 0, NULL, NULL);
         }
         return 0;
    case WM_VSCROLL:
         // Get all the vertial scroll bar information
         si.cbSize = sizeof (si);
         si.fMask  = SIF_ALL;
         GetScrollInfo (hwnd, SB_VERT, &si);         // Save the position for comparison later on
         yPos = si.nPos;         switch (LOWORD (wParam))
         {
         // user clicked the HOME keyboard key
         case SB_TOP:
              si.nPos = si.nMin;
              break;

         // user clicked the END keyboard key
         case SB_BOTTOM:
              si.nPos = si.nMax;
              break;

         // user clicked the top arrow
         case SB_LINEUP:
              si.nPos -= 1;
              break;

         // user clicked the bottom arrow
         case SB_LINEDOWN:
              si.nPos += 1;
              break;

         // user clicked the shaft above the scroll box
         case SB_PAGEUP:
              si.nPos -= si.nPage;
              break;

         // user clicked the shaft below the scroll box
         case SB_PAGEDOWN:
              si.nPos += si.nPage;
              break;

         // user dragged the scroll box
         case SB_THUMBTRACK:
              si.nPos = si.nTrackPos;
              break;

         default:
              break;
         }         // Set the position and then retrieve it.  Due to adjustments
         //   by Windows it may not be the same as the value set.
         si.fMask = SIF_POS;
         SetScrollInfo (hwnd, SB_VERT, &si, TRUE);
         GetScrollInfo (hwnd, SB_VERT, &si);         // If the position has changed, scroll window and update it
         if (si.nPos != yPos)
         {
          ScrollWindow(hwnd, 0, yChar * (yPos - si.nPos), NULL, NULL);
          UpdateWindow (hwnd);
         }
         return 0;
             case WM_PAINT :
         // Prepare the window for painting
         hdc = BeginPaint (hwnd, &ps);         // Get vertical scroll bar position
         si.cbSize = sizeof (si);
         si.fMask  = SIF_POS;
         GetScrollInfo (hwnd, SB_VERT, &si);
         yPos = si.nPos;         // Get horizontal scroll bar position
         GetScrollInfo (hwnd, SB_HORZ, &si);
         xPos = si.nPos;         // Find painting limits
         FirstLine = max (0, yPos + ps.rcPaint.top / yChar);
         LastLine = min (LINES - 1, yPos + ps.rcPaint.bottom / yChar);

         for (i = FirstLine; i <= LastLine; i++)
         {
              x = xChar * (1 - xPos);
              y = yChar * (i - yPos);

              TextOut (hdc, x, y, abc[i], lstrlen(abc[i]));
         }         // Indicate that painting is finished
         EndPaint (hwnd, &ps);
         return 0;

    case WM_DESTROY :
         PostQuitMessage (0);
         return 0;
    }
    return DefWindowProc (hwnd, uMsg, wParam, lParam);
}

找到一个小于65536大小的方法，如下
if( nSBCode == SB_THUMBTRACK )
{
if( nPos > 32767)
{
nPos = 65536 + (int)nPos;
}
}
CScrollView::OnVScroll(nSBCode, nPos, pScrollBar);
暂时是一个解决方法吧！

调试易

VC中使用滚动条拖拽失败，解决不了？

解决方案 »