C / C++ / MFC

while(1)
   {	
		if(kbhit())
		{
			key=getch();
			if(key=='x')
			{
				CloseHandle(hCom);
				exit(0);
			}
			switch(key)
			{
			case '1':
// code to issue command ATDW2289759\r\n
}
}
} 

Royce Fickling wrote:

Why can't I use CString objects as my arguments?

void COdb::WriteAttribute( CStdioFile& fileOutput, LPCTSTR strTagName, LPCTSTR strAttribute, LPCTSTR strValue, ... )
{	
    va_list vl;	
    va_start( vl, strValue );	
    CString strBuffer;	
    strBuffer.Format( "  <%s %s=\"%s\"/>", strTagName, strAttribute, strValue);
    LPCTSTR strOpAttr = va_arg( vl, LPCTSTR);
}

void COdb::WriteAttribute( CStdioFile& fileOutput, 
			        const CString& strTagName,
			        const CString& strAttribute, 
			        const CString strValue, ... )
...

#define _ADDRESSOF(v)   ( &reinterpret_cast<const char &>(v) )
#define _INTSIZEOF(n)   ( (sizeof(n) + sizeof(int) - 1) & ~(sizeof(int) - 1) )

#define _crt_va_start(ap,v)  ( ap = (va_list)_ADDRESSOF(v) + _INTSIZEOF(v) )
#define _crt_va_arg(ap,t)    ( *(t *)((ap += _INTSIZEOF(t)) - _INTSIZEOF(t)) )
#define _crt_va_end(ap)      ( ap = (va_list)0 )

*edit* Now that the caffeine has kicked in, I realize taking the address<br />
of a reference gives you the address of the object referenced, not the<br />
address of the reference.  Yeah - those macros weren't meant to work<br />
with references

Mark Salsbery
Microsoft MVP - Visual C++

void COdb::WriteAttribute( CStdioFile& fileOutput, 
			LPCTSTR strTagName,
			LPCTSTR strAttribute, 
			LPCTSTR strValue, ... )
{
	va_list vl;
	va_start( vl, strValue );

	CString strBuffer;
	strBuffer.Format( "  <%s %s=\"%s\"/>", 
				strTagName, strAttribute, strValue );

	LPCTSTR pstrOpArg = va_arg( vl, LPCTSTR );
	CString strOption;
	bool bAttr = true;
	while ( pstrOpArg )
	{
		if ( bAttr )
		{
			strOption.Format( "%s=", pstrOpArg );
			strBuffer += strOption;
			bAttr = false;
		}
		else
		{
			strOption.Format( "\"%s\"", pstrOpArg );
			strBuffer += strOption;
			bAttr = true;
		}

		pstrOpArg = va_arg( vl, LPCTSTR );
	}

	fileOutput.WriteString( strBuffer );
}

Royce Fickling wrote:

I thought that if the optional arguments were not passed, the first call to va_arg would return a null, but that is not the case.

Mark Salsbery
Microsoft MVP - Visual C++

CodingLover wrote:

I search on the google but didn't find a best one.

suresh zende wrote:

specs as in wat sense?

Mark Salsbery
Microsoft MVP - Visual C++

Open the file
Loop until done:
   Read a video frame
   Do something with the video frame
Close the file

Mark Salsbery
Microsoft MVP - Visual C++