http://www.nnseek.com/e/cn.comp.lang.vc/ Posts for cn.comp.lang.vc Mon, 12 May 2008 00:15:33 PDT http://www.nnseek.com/ http://www.nnseek.com/img/64.png 64 64 NNSeek http://www.nnseek.com/e/cn.comp.lang.vc/tag_heuer_replica_watches_121192593t.html http://www.nnseek.com/e/cn.comp.lang.vc/tag_heuer_replica_watches_121192593t.html
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]]> Mon, 12 May 2008 00:15:33 PDT http://www.nnseek.com/e/cn.comp.lang.vc/goatse_107958161t.html http://www.nnseek.com/e/cn.comp.lang.vc/goatse_107958161t.html

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]]> Sat, 01 Mar 2008 10:45:47 PST http://www.nnseek.com/e/cn.comp.lang.vc/_85_windows_8287419239_6433_97644177t.html http://www.nnseek.com/e/cn.comp.lang.vc/_85_windows_8287419239_6433_97644177t.html

//开始的事件是这样声明的
OVERLAPPED m_osWrite;
m_osWrite.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);

//调用的代码:
//////////////////////////////////////////////////////////

if(m_pDevice->m_strDeviceModel == "yyyyy")
{
strcpy(sBuf,"MA!");
dwLength = 3;
}

int fState;
DWORD dwBytesWritten = 0;//实际发送字节数
DWORD dwErrors = 0;
try
{
m_port.ClearError(dwErrors);
if (dwErrors != 0)
{
dwErrors = 0;
}
fState = m_port.Write(sBuf,dwLength,m_osWrite);// 写串口 通常在这里出错
// 错误是无效句柄和/或 error 6,
// 但 m_port 的句柄明明是有的
// 否则前面不可能打开端口成功...
// Write 函数调用的是一个现成的程序段,
// 内容见下.
if(!fState)
{
if(GetLastError()==ERROR_IO_PENDING)
{
m_port.GetOverlappedResult(m_osWrite,dwBytesWritten,TRUE); //等待
}
}
}
catch (CSerialException* pEx)
{
pEx->Delete();
return;
}
if(dwBytesWritten != dwLength)//发送数据长度不符
{
m_port.Purge(PURGE_TXCLEAR | PURGE_TXABORT);//清除发送缓存内容
}


上面程序调用的 Write 程序段如下
BOOL CSerialPort::Write(const void* lpBuf, DWORD dwCount, OVERLAPPED& overlapped)
{
ASSERT(IsOpen());
ASSERT(m_bOverlapped);
ASSERT(overlapped.hEvent);

DWORD dwBytesWritten = 0;
BOOL bSuccess = WriteFile(m_hComm, lpBuf, dwCount, &dwBytesWritten, &overlapped);
if (!bSuccess)
{
if (GetLastError() != ERROR_IO_PENDING)
{
TRACE(_T("Failed in call to WriteFile\n")); // <-- 有时候会进到这里...
AfxThrowSerialException();
}
}
return bSuccess;
}

调试时会发生 Invalidate handle 或是 error 6 这样的错误, 但看串口的句柄, 在之前都是存在的, 串口肯定是正确打开的. 出错通常都是写端口时发生, 但偶尔也在别的地方发生, 串口通信和打开使用 overlapped 模式. 串口本身肯定没问题, 可以用 HyperTerm 正常的通信. 写串口的程序是单独的一个线程.

请问造成错误的原因可能是什么呢? 谢谢

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]]> Fri, 04 Jan 2008 07:06:33 PST http://www.nnseek.com/e/cn.comp.lang.vc/gcc350545215_z_91242897t.html http://www.nnseek.com/e/cn.comp.lang.vc/gcc350545215_z_91242897t.html 转自 Solidot http://linux.solidot.org/article.pl?sid=07/11/19/0512218&from=rss :


linux程序不能区分正数和负数，例如，-10和10会被认为是相等的。真的是这样吗？试试以下的C代码：
int main () {
int i=2;
if( -10*abs (i-1) == 10*abs(i-1) )
printf ("OMG,-10==10 in linux!\n");
else
printf ("nothing special here\n");
}
同样的C代码，在windows和unix系统中编译运行的结果是nothing special here，只有linux得到是-10==10。
恩，我们的gcc在这里犯了一个低级错误。

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]]> Mon, 19 Nov 2007 02:31:52 PST http://www.nnseek.com/e/cn.comp.lang.vc/_136_4_68384_60_89913489t.html http://www.nnseek.com/e/cn.comp.lang.vc/_136_4_68384_60_89913489t.html

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]]> Tue, 13 Nov 2007 04:12:30 PST http://www.nnseek.com/e/cn.comp.lang.vc/google_video_downloader_keygen_1247_1_2_84744081t.html http://www.nnseek.com/e/cn.comp.lang.vc/google_video_downloader_keygen_1247_1_2_84744081t.html chddjdcciffucgevlcisdlfjodhxthbojwd

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]]> Fri, 19 Oct 2007 15:32:05 PDT http://www.nnseek.com/e/cn.comp.lang.vc/_57730842994_83968145t.html http://www.nnseek.com/e/cn.comp.lang.vc/_57730842994_83968145t.html
现在的问题是, 由于每组数据长度不同, 分割这些数据有困难, 有没有比较好的方法设计这个二进制文件的格式呢?

谢谢~

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]]> Tue, 16 Oct 2007 22:31:10 PDT http://www.nnseek.com/e/cn.comp.lang.vc/new_apple_ipod_nano_82312337t.html http://www.nnseek.com/e/cn.comp.lang.vc/new_apple_ipod_nano_82312337t.html

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]]> Sat, 06 Oct 2007 18:19:33 PDT http://www.nnseek.com/e/cn.comp.lang.vc/how_i_built_muscle_quickly_82292113t.html http://www.nnseek.com/e/cn.comp.lang.vc/how_i_built_muscle_quickly_82292113t.html

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]]> Sat, 06 Oct 2007 16:17:45 PDT http://www.nnseek.com/e/cn.comp.lang.vc/sending_faxes_over_the_internet_82267281t.html http://www.nnseek.com/e/cn.comp.lang.vc/sending_faxes_over_the_internet_82267281t.html

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]]> Sat, 06 Oct 2007 14:02:59 PDT