请大神帮我看看代码哪里出问题了，运行后没有显示！ Win32 SDK编程！

[Win32Nerd]

提前感谢！
代码如下：

#include <windows.h>
#include "sysmets.h"
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain( __in HINSTANCE hInstance, __in_opt HINSTANCE hPrevInstance, __in_opt LPSTR lpCmdLine, __in int nShowCmd )
{
	static TCHAR szAppName[] = TEXT("SysMets With VerticalScrollBar");
	MSG			 message;
	HWND	     hWnd;
	WNDCLASS     wndcls;

	wndcls.cbClsExtra = 0;
	wndcls.cbWndExtra = 0;
	wndcls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndcls.hCursor    = LoadCursor(NULL,IDC_ARROW);
	wndcls.hIcon      = LoadIcon(NULL,IDI_ERROR);
	wndcls.hInstance  = hInstance;
	wndcls.lpfnWndProc = WndProc;
	wndcls.lpszClassName = szAppName;
	wndcls.lpszMenuName = NULL;
	wndcls.style      = CS_VREDRAW | CS_HREDRAW;

	if (!RegisterClass(&wndcls))
	{
		MessageBox(NULL,TEXT("对不起，注册窗口类失败！"),TEXT("错误"),MB_OK | MB_ICONERROR);
		return 0;
	}

	hWnd = CreateWindow(szAppName,
		               TEXT("Sysmets With VScrollBar"),
					   WS_OVERLAPPEDWINDOW | WS_VSCROLL,
					   CW_USEDEFAULT,
					   CW_USEDEFAULT,
					   CW_USEDEFAULT,
					   CW_USEDEFAULT,
					   NULL,
					   NULL,
					   hInstance,
					   NULL);

	ShowWindow(hWnd,nShowCmd);
	
	UpdateWindow(hWnd);

	while(GetMessage(&message,NULL,0,0))
	{
		TranslateMessage(&message);
		DispatchMessage(&message);
	}
   return message.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	static int cxChar, cxCaps, cyChar, cyClient, iVScrollPos;
	HDC hDC;
	PAINTSTRUCT ps;
	int i, y ;
	TCHAR szBuffer[10];
	TEXTMETRIC tm;

	switch (message)
	{
	case WM_CREATE:
		hDC = GetDC(hwnd);
		GetTextMetrics(hDC,&tm);
		cxChar = tm.tmAveCharWidth;
		cyChar = tm.tmHeight + tm.tmExternalLeading;
		cxCaps = (tm.tmPitchAndFamily & 1 ? 3: 2) * cxChar / 2;

		ReleaseDC(hwnd,hDC);

		SetScrollRange(hwnd,SB_VERT,0,NUMLINES - 1, FALSE);
		SetScrollPos(hwnd,SB_VERT,0,TRUE);

		return 0;

	case WM_SIZE:
		cyClient = HIWORD(lParam);

		return 0;
	case WM_VSCROLL:
		switch (LOWORD(wParam))
		{
		case SB_LINEUP:
			iVScrollPos -= 1;
			break;
		case SB_LINEDOWN:
			iVScrollPos += 1;
			break;
		case SB_PAGEUP:
			iVScrollPos -= cyClient / cyChar;
			break;

		case SB_PAGEDOWN:
			iVScrollPos += cyClient / cyChar;
			break;

		case SB_THUMBPOSITION:
			iVScrollPos = HIWORD(wParam);
			break;

		default:
			break;
		}
		iVScrollPos = max(0,min(iVScrollPos,NUMLINES - 1));

		if (iVScrollPos != GetScrollPos(hwnd,SB_VERT))
		{
			SetScrollPos(hwnd,SB_VERT,iVScrollPos,TRUE);
			InvalidateRect(hwnd,NULL,TRUE);
		}

		return 0;
	case WM_PAINT:

		hDC = BeginPaint(hwnd,&ps);
		for (i = 0; i < NUMLINES; i++)
		{
			y = cyChar * (i - NUMLINES);
			TextOut(hDC,0,y, sysmetrics[i].szLabel,lstrlen(sysmetrics[i].szLabel));
			TextOut (hDC, 22 * cxCaps, y,  
				sysmetrics[i].szDesc,  
				lstrlen (sysmetrics[i].szDesc)) ;  

			SetTextAlign (hDC, TA_RIGHT | TA_TOP) ;  

			TextOut (hDC, 22 * cxCaps + 40 * cxChar, y, szBuffer,  
				wsprintf (szBuffer, TEXT ("%5d"),  
				GetSystemMetrics (sysmetrics[i].iIndex))) ;  

			SetTextAlign (hDC, TA_LEFT | TA_TOP) ;  
		}  
		EndPaint (hwnd, &ps) ;  
		return 0 ;  

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

我按照网上说的加上#define WINVER 0x0501 也没有显示！

[Win32Nerd]

谢谢各位，我把原来的y = cyChar * (i - NUMLINES); 改为 y = cyChar * (i - iVScrollBar) 就可以了！

[worldy]

没显示指什么？没有显示窗口？还是窗口没有显示内容？

[Win32Nerd]

窗口能显示！但是窗口里面没有显示！！！ @ worldy

[worldy]

显示超出范围了，WM_PAIT改成下面代码试试 case WM_PAINT: hDC = BeginPaint(hwnd,&ps); TextOut(hDC,0,0,"ABC",3); EndPaint (hwnd, &ps) ; case ....

[Sandrer]

y = cyChar * (i - NUMLINES); 这个得出来的纵坐标是负数，所以你的东西都被画到客户端的“上面”去了 试试改成 y = cyChar * i;