怎么让滚动条动起来？

[xieqi]

我创建了滚动条，也接受了滚动条消息。但我不知道该怎么让滚动条上移，或下移。
代码如下：
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#include "windows.h"
HINSTANCE hInst;
HWND hWndMain;
LRESULT APIENTRY MainWndProc(HWND, UINT, WPARAM, LPARAM);

BOOL InitInstance(HINSTANCE,int);
BOOL InitApplication(HINSTANCE);

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;

if (!InitApplication (hInstance))
{
return FALSE;
}

if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

// SendMessage(hWndMain,WM_COMMAND,IDM_DRAW,0L);

while (GetMessage(&msg, NULL, 0, 0))
{

TranslateMessage(&msg);
DispatchMessage(&msg);

}

return msg.wParam;
}

BOOL InitApplication (HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)MainWndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, "ScrollBarIcon");
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = "";
wcex.lpszClassName = "SCROLL";
wcex.hIconSm = LoadIcon(hInstance, "ScrollBarIcon");

return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
hWndMain = CreateWindow("SCROLL", "SCROLLBAR1", WS_OVERLAPPEDWINDOW|WS_HSCROLL|WS_VSCROLL,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWndMain)
{
return FALSE;
}


ShowWindow(hWndMain, nCmdShow);
UpdateWindow(hWndMain);

return TRUE;
}

LRESULT APIENTRY MainWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{


PAINTSTRUCT ps;
HDC hdc;
char * szHello;
szHello="如何使滚动条动起来啊？";
switch(message)
{
case WM_VSCROLL:
switch(LOWORD(wParam))
{
case SB_LINEUP:
MessageBox(NULL,"你点中了 上 移滚动条，但是滚动条不响应","提示",MB_OK);//在这里加什么代码让滚动条上移
break;
case SB_LINEDOWN:
MessageBox(NULL,"你点中了 下 移滚动条，但是滚动条不响应","提示",MB_OK);//在这里加什么代码让滚动条下移
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}

break;

case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
RECT rt;
GetClientRect(hWnd, &rt);
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
EndPaint(hWnd, &ps);
break;

case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);

}
return(0);
}
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点中滚动条后会提示你点中了，但我怎么让他上移下移呢？

[老夏Max]

呵呵，参考：
void CNetworkView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
//add by qqxia
switch (nChar)
{
case VK_HOME:
OnVScroll(SB_TOP, 0, NULL);
OnHScroll(SB_LEFT, 0, NULL);
break;
case VK_END:
OnVScroll(SB_BOTTOM, 0, NULL);
OnHScroll(SB_RIGHT, 0, NULL);
break;
case VK_UP:
OnVScroll(SB_LINEUP, 0, NULL);
break;
case VK_DOWN:
OnVScroll(SB_LINEDOWN, 0, NULL);
break;
case VK_PRIOR:
OnVScroll(SB_PAGEUP, 0, NULL);
break;
case VK_NEXT:
OnVScroll(SB_PAGEDOWN, 0, NULL);
break;
case VK_LEFT:
OnHScroll(SB_LINELEFT, 0, NULL);
break;
case VK_RIGHT:
OnHScroll(SB_LINERIGHT, 0, NULL);
break;
default:
break;
}
}

[handwolf]

下面两个函数应该是关键！
自己可以查查msdn
SetScrollRange(SB_VERT, 0, m_nVscrollMax, FALSE);
SetScrollPos(SB_VERT, m_nVscrollPos, TRUE);