在对话筐上滚动输出文字，经过一段时间后系统所有的中文字体不能显示为什么？

Question

如提

Answer 1

HFONT CNotesStatusDraw::CreateFont(CString strFont, int nCharHeight, int nCharWidth)
{
HFONT hFont;
hFont= ::CreateFont(                                //定义字体句柄
nCharHeight,                                 //字体高度
nCharWidth,                                  //系统选取字体最佳宽度
0,                                   //倾斜度为0，表示水平
0,                                   //字体倾斜度为0
560,                                 //字体粗度，400为正常
0,                                   //无斜体字
0,                                   //无下划线
0,                                   //无删除线
ANSI_CHARSET,                        //所用的字符集
OUT_DEFAULT_PRECIS,                  //输出粗度为默认值
OUT_DEFAULT_PRECIS,                  //裁减粗度为默认值
DEFAULT_QUALITY,                     //输出质量为默认值
DEFAULT_PITCH|FF_DONTCARE,           //字间距和字体系列
LPCTSTR(strFont));                             //字体名称 return  hFont;
}void CNotesStatusDraw::DrawNotesStatus()
{
HDC hbkDC,hDC,hmemDC;
HBITMAP hOldBmpMem,hbkBmp,hOldBmpBk;

HFONT holdFont;                           //定义字体句柄
PAINTSTRUCT ps;                     //包含绘图信息的结构体变量
RECT rcWnd,rect;
SIZE size;
HBRUSH hbkBrush;

//定义输出的字符串
if(m_strDspValue == "") 
{
m_nPicX = 0;
m_strDspValue = m_strDspMem;
//m_strDspValue = "我么阿三点放将阿联赛的经费阿三点发送到非";
}
//处理绘图消息
GetWindowRect(m_hWnd,&rcWnd); hDC=BeginPaint(m_hWnd,&ps);   hmemDC = CreateCompatibleDC(hDC);

hbkBmp = CreateCompatibleBitmap(hDC,rcWnd.right-rcWnd.left,rcWnd.bottom-rcWnd.top);

hOldBmpMem = (HBITMAP)SelectObject(hmemDC,hbkBmp);

    hbkBrush = CreateSolidBrush(RGB(214,206,198));

rect.left = 0;
rect.top  = 0;
rect.right= rcWnd.right-rcWnd.left;
rect.bottom = rcWnd.bottom-rcWnd.top; FillRect(hmemDC,&rect,hbkBrush);

//SelectObject(hmemDC,hOldBmpMem);
//画背景
hbkDC = CreateCompatibleDC(hDC); hOldBmpBk =(HBITMAP) SelectObject(hbkDC,m_hBitmapBk);

StretchBlt(hmemDC,
0,
(rcWnd.bottom-rcWnd.top-m_bitmapBk.bmHeight)/2,
rcWnd.right-rcWnd.left,
(m_bitmapBk.bmHeight+rcWnd.bottom-rcWnd.top)/2+1,
hbkDC,
0,
0,
m_bitmapBk.bmWidth,
m_bitmapBk.bmHeight,
SRCCOPY
); SelectObject(hbkDC,hOldBmpBk); DeleteDC(hbkDC);
//画字
SetTextColor(hmemDC,m_corWord);

SetBkMode(hmemDC,TRANSPARENT);

m_hf = CreateFont(m_strFace,m_nFontHeight,m_nFontWidth); holdFont = (HFONT)SelectObject(hmemDC,m_hf);

GetTextExtentPoint32(hmemDC,m_strDspValue,m_strDspValue.GetLength(),&size);

TextOut(hmemDC,-m_nPicX+rcWnd.right-rcWnd.left,(rcWnd.bottom-rcWnd.top-size.cy)/2,(LPCTSTR)m_strDspValue,m_strDspValue.GetLength());

StretchBlt(hDC,2,0,rcWnd.right-rcWnd.left-2,rcWnd.bottom-rcWnd.top,hmemDC,0,0,rcWnd.right-rcWnd.left,rcWnd.bottom-rcWnd.top,SRCCOPY);

SelectObject(hmemDC,holdFont);

DeleteObject(m_hf);

DeleteObject(hbkBrush);

DeleteDC(hmemDC);

EndPaint(m_hWnd,&ps);  if(m_nPicX > size.cx + rcWnd.right-rcWnd.left)
{
m_nPicX = 0;
m_strDspValue = "";
}}DrawNotesStatus() 运行一段时间后，画面不再滚动，我通过spy可以看到还在继续触发这个函数，请问这是为什么？

Answer 2

在任务管理器中看看你的GDI对象是不是一直在增加，考虑GDI泄漏

Answer 3

m_hf = CreateFont(m_strFace,m_nFontHeight,m_nFontWidth);
里面创建字体没有删除导致资源耗尽

Answer 4

资源没有释放
http://blog.csdn.net/bobob/archive/2005/12/29/565188.aspx

Answer 5

资源管理器中窗口句柄没有明显增加，createfont对象我用deleteobject删除，运行一段时间后报AVCException 错误。重新修改后的代码：

Answer 6

void CNotesStatusDraw::DrawNotesStatus()
{
HDC hbkDC,hDC,hmemDC;
HBITMAP hbkBmp,holdBkBmp,holdMemBmp;

// HFONT holdFont;                           //定义字体句柄
PAINTSTRUCT ps;                     //包含绘图信息的结构体变量
RECT rcWnd,rect;

HBRUSH hbkBrush;
BOOL bRet;
try{

GetWindowRect(m_hWnd,&rcWnd);
//初始化
hDC=BeginPaint(m_hWnd,&ps);  
if(hDC == NULL)
{
return;
}
//创建背景双缓存背景
hmemDC = CreateCompatibleDC(hDC);
if(hmemDC == NULL)
{

DeleteDC(hmemDC);
return;
}

hbkBmp = CreateCompatibleBitmap(hDC,rcWnd.right-rcWnd.left,rcWnd.bottom-rcWnd.top);
if(hbkBmp == NULL)
{

DeleteDC(hmemDC);
return;
}

holdMemBmp = (HBITMAP)SelectObject(hmemDC,hbkBmp);

hbkBrush = CreateSolidBrush(RGB(214,206,198));
if(hbkBrush == NULL)
{

DeleteDC(hmemDC);
return;
}


rect.right= rcWnd.right-rcWnd.left;
rect.bottom = rcWnd.bottom-rcWnd.top;
rect.left = 0;
rect.top  = 0;
FillRect(hmemDC,&rect,hbkBrush);
DeleteObject(hbkBmp);
DeleteObject(hbkBrush);
//

//画背景
hbkDC = CreateCompatibleDC(hDC);
if(hbkDC == NULL)
{

DeleteDC(hmemDC);
return;
}

holdBkBmp = (HBITMAP)SelectObject(hbkDC,m_hBitmapBk);

bRet = StretchBlt(hmemDC,
0,
(rcWnd.bottom-rcWnd.top-m_bitmapBk.bmHeight)/2,
rcWnd.right-rcWnd.left,
(m_bitmapBk.bmHeight+rcWnd.bottom-rcWnd.top)/2+1,
hbkDC,
0,
0,
m_bitmapBk.bmWidth,
m_bitmapBk.bmHeight,
SRCCOPY
);

if(bRet == 0)
{
SelectObject(hbkDC,holdBkBmp); DeleteDC(hmemDC);
DeleteDC(hbkDC);
return ;
}
SelectObject(hbkDC,holdBkBmp); DeleteDC(hbkDC);

//画字
SetTextColor(hmemDC,m_corWord);

SetBkMode(hmemDC,TRANSPARENT);

m_hf = CreateFont(m_strFace,m_nFontHeight,m_nFontWidth,m_nFontWidth);

if(m_hf == NULL)
{

DeleteDC(hmemDC);
DeleteObject(m_hf);
return;
}

SelectObject(hmemDC,m_hf);
// if(holdFont == NULL)
// return;

bRet = DrawNotesText(hmemDC);
if(bRet == 0)
{

DeleteDC(hmemDC);
DeleteObject(m_hf);
return ;
}


bRet = StretchBlt(hDC,2,0,rcWnd.right-rcWnd.left-2,rcWnd.bottom-rcWnd.top,hmemDC,0,0,rcWnd.right-rcWnd.left,rcWnd.bottom-rcWnd.top,SRCCOPY);
if(bRet == 0)
return ;

SelectObject(hmemDC,holdMemBmp);

DeleteObject(m_hf);

DeleteDC(hmemDC);


EndPaint(m_hWnd,&ps); 
}
catch(CException e)
{
char buf[100]={0};
e.GetErrorMessage(buf,100);
AfxMessageBox(buf);
}



}//画出滚动字符
BOOL CNotesStatusDraw::DrawNotesText(const HDC &hmemDC)
{
POSITION pos;
ITEMINFOR itemInfor;
SIZE size;

if(m_nMouseOver == TRUE)
return FALSE;
try{
//进入互斥
EnterCriticalSection(&m_criticalSection);

IncreaseDisplayPos(hmemDC);
//退出互斥
LeaveCriticalSection(&m_criticalSection);

GetTextExtentPoint32(hmemDC,"模板",4,&size);
pos = m_lstCurDisplayItem.GetHeadPosition();
while(pos)
{
itemInfor = m_lstCurDisplayItem.GetNext(pos);
TextOut(hmemDC,itemInfor.nShowLeft,(m_rectWnd.bottom-m_rectWnd.top -size.cy+2)/2,itemInfor.strItemValue,itemInfor.strItemValue.GetLength());
}
}
catch (...) {
CFile file;
file.Open("D:\\a.txt",CFile::modeCreate|CFile::modeNoTruncate|CFile::modeWrite);
file.SeekToEnd();
file.Write("DrawNotesStatus error \r\n",100);
file.Close();
}

return TRUE ;
}