CFile/CStdioFile Carriage return not being picked up - C / C++ / MFC Discussion Boards

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Prasad
Notifier using ATL | Operator new[],delete[][^]

And see Internationalization and Multiple Language Support[^]

WhiteSky

i need to know if there is a api for the copy command used in cmd window
ex.. copy /b file1 + file2 output file

Haven't you checked CopyFile[^]?

Prasad
Notifier using ATL | Operator new[],delete[][^]

ok ive been trying copyfile but how do i make it join 2 files?
somemovie cd1.avi + somemovie cd2.avi = 1 joined avi file?

And See File Management Functions
[^]

WhiteSky

I serialized data to a file. Data file consists of many lines, so each has it's carriage return at the end. The problem is, the reader cannot pickup the carriage return. My observation is, when I open the file with Notepad++ or Wordpad, you can visually see the carriage return. When open with notepad (and my application's reader class), the carriage return isn't picked up.

Here's the code extract ...

1. Writing to data file

<br />
CFile oFile;<br />
oFile.Open("...", CFile::modeCreate|CFile::modeWrite|CFile::shareDenyWrite);<br />
<br />
for(int nIndex=0; nIndex<nSize; nIndex++) {<br />
			strLine = oLines.GetAt(nIndex);<br />
/*<br />
				WINBASEAPI<br />
				int<br />
				WINAPI<br />
				WideCharToMultiByte(<br />
					UINT     CodePage,<br />
					DWORD    dwFlags,<br />
					LPCWSTR  lpWideCharStr,<br />
					int      cchWideChar,<br />
					LPSTR    lpMultiByteStr,<br />
					int      cchMultiByte,<br />
					LPCSTR   lpDefaultChar,<br />
					LPBOOL   lpUsedDefaultChar);<br />
			*/<br />
			strLine += L"\n";<br />
			iLen = strLine.GetLength();<br />
			pMultiByteStr = new char[iLen]; <br />
			WideCharToMultiByte(CP_ACP, 0, (LPCWSTR) strLine.GetBuffer(iLen), -1, pMultiByteStr, iLen, "", &bUsedDefaultChar);<br />
			oFile.Write(pMultiByteStr, iLen);<br />
		}

2. Reading from data file [It simply read one line and exited]

<br />
int CSomeClass::ReadThisFile{<br />
	int iCount = 0;<br />
	CString sLine;<br />
        CStdioFile		oFile;<br />
<br />
	try<br />
	{<br />
		if (!OpenFile("..."))<br />
			return 0;<br />
<br />
		if (m_bHeaderRow)<br />
			oFile.ReadString(sLine);<br />
<br />
		while (oFile.ReadString(sLine))<br />
		{<br />
			// we ignore blank lines<br />
			if (sLine.GetLength() > 0)<br />
				iCount++;<br />
		}		<br />
		oFile.Close();<br />
	}<br />
	catch (...)<br />
	{<br />
		...<br />
	}<br />
<br />
	return iCount;<br />
}<br />

Any clue? Thanks

What if you try a carriage-return/linefeed pair?

strLine += L"\r\n";

It works Lord Salsbery!!

Norman Fung

Project-->Link：winmm.lib
#include "mmsystem.h"

BOOL GetRecordradio()
{

UINT m_uMxId2;
//HWND m_hWnd;//回调句柄
HMIXER m_hmx2;
MIXERCAPS mxcaps;

//返回系统中混音器数量(如:一块普通声卡提供一个混音器设备)
int devnum=mixerGetNumDevs();
int i=0;

for(i;i<devnum;i++)
{
m_umxid2=i;
if (mmsyserr_noerror="" !="
mixerOpen(&m_hmx2," m_umxid2,null,="" 0,="" callback_window))
="" 使用dwcallback参数
return="" -1;

="" 得到相应设备标识号
="" mixergetid((hmixerobj)m_hmx2,&m_umxid,mixer_objectf_hmixer);

="" 确定各混音器设备的能力:保存在mxcaps结构中（wmid,wpid,szname,cdestinations）
if="" false;

="" 检索指定音频线路的信息,保存在mixerline结构中，
="" 其中一些成员根据不同情况要初始化
mixerline="" mxl;
mxl.cbstruct="sizeof(MIXERLINE);" 必须赋值

="" 可以通过多种条件来检索：
="" 方式一：根据目标单元编号
="" mxl.dwdestination="0;等同用mxl.dwComponentType=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS
//mxl.dwDestination=1;等同用mxl.dwComponentType=MIXERLINE_COMPONENTTYPE_DST_WAVEIN
//对应flag:" mixer_getlineinfof_destination
="" =="" mixerline_componenttype_dst_wavein;
="" 对应flag:="" mixer_getlineinfof_componenttype

if="" (::mixergetlineinfo((hmixerobj)m_hmx2,
&mxl,
mixer_objectf_hmixer="" |
mixer_getlineinfof_componenttype)
!="MMSYSERR_NOERROR)" return="" 查询="" 录音控制面版中="" 麦克风线路的编号=""
mixerline="" mxl_v;
uint="" cconnections="(UINT)mxl.cConnections;
UINT" dwsource_v="0;
do
{
mxl_v.cbStruct" sizeof(mxl_v);
mxl_v.dwdestination="mxl.dwDestination;
mxl_v.dwSource" dwsource_v;
dwsource_v++;
if=""
&mxl_v,=""
mixer_getlineinfof_source))
return="" false;
}="" while="" ((dwsource_v="" <="" cconnections)="" &&=""
(mxl_v.dwcomponenttype=""> cConnections) ||
(mxl_v.dwComponentType !=MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE))
return FALSE;
dwSource_v--;//得到编号

//下面这段文字说明在本例中已经没有什么实际意义，是以前调试时留下的，也不删除了，
//可以知道如何控制主音（Volume）线路的禁音状态：
//－－可以利用得到的主音（Volume）线路的mxl.dwLineID,
//来查询Volume的禁音状态
//要想查询（或设置）可以混音到DST_SPEAKERS主音（Volume）中的
//相关音源线路（如：wave、micphone等）的禁音状态，还必须再使用
//一次 mixerGetLineInfo 进一步指定其dwLineID
//注意：不要简单的直接修改上面的：
//mxl.dwComponentType = 类型;
//虽然可能有时不会报错，但这成了我们程序中的隐患，
//因为有的线路在DST_SPEAKERS和DST_WAVEIN中均有，如：
//MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC

//下面实现了"强制"单选麦克风线路为录音源输入
MIXERCONTROL mxc;
MIXERLINECONTROLS mxlc;
mxlc.cbStruct = sizeof(MIXERLINECONTROLS);
mxlc.dwLineID = mxl.dwLineID;
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUX;
//MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeof(MIXERCONTROL);
mxlc.pamxctrl = &mxc; //为了得到相应的mxc.dwControlID，
//锁定mxlc.dwLineID和mxlc.dwControlType指定的线路控制
//目前将对录音目标单元的录音音源线路做单选（多路复用）
if (::mixerGetLineControls((HMIXEROBJ)m_hmx2,
&mxlc,
MIXER_OBJECTF_HMIXER |
MIXER_GETLINECONTROLSF_ONEBYTYPE)
!= MMSYSERR_NOERROR) return -1;

//根据mxc.dwControlID检索线路，
MIXERCONTROLDETAILS_BOOLEAN mxcdMute[8];
MIXERCONTROLDETAILS mxcd;
mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
mxcd.dwControlID = mxc.dwControlID;//在上面的&mxc得到
mxcd.cChannels = 1;
mxcd.cMultipleItems =mxc.cMultipleItems;//多路因子数目
mxcd.cbDetails = sizeof(*mxcdMute);
mxcd.paDetails =&mxcdMute;//存放检索结果
if (::mixerGetControlDetails((HMIXEROBJ)m_hmx2,
&mxcd,
MIXER_OBJECTF_HMIXER |
MIXER_GETCONTROLDETAILSF_VALUE)
!= MMSYSERR_NOERROR) return -1;

//做相应单选改变
int j;
for(j=0;j<(int)mxc.cMultipleItems;j++)
mxcdMute[j].fValue=false;
mxcdMute[dwSource_v].fValue=true;

//重新设置dwControlID锁定的线路控制
if (::mixerSetControlDetails((HMIXEROBJ)m_hmx2,
&mxcd,
MIXER_OBJECTF_HMIXER |
MIXER_GETCONTROLDETAILSF_VALUE)
!= MMSYSERR_NOERROR) return -1;
}//for(i;i

I need to convert a COLORREF value to 3 COLOR16 (hex) values. I'm trying to fill out this structure:

typedef struct _TRIVERTEX {
  LONG        x;
  Long        y;
  COLOR16     Red;
  COLOR16     Green;
  COLOR16     Blue;
  COLOR16     Alpha;
}TRIVERTEX, *PTRIVERTEX;

GetRValue, GetGValue, and GetBValue will give me color intensity integers, but those need to be converted to hex values. So to be more precise I need to convert from an integer to a COLOR16 hex value. Anyone got ideas?

From the docs:

The color information of each channel is specified as a value from 0x0000 to 0xff00.

So you can take the one-byte value from the COLORREF and multiply by 256.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

How do I take the 1 byte value from it?

It's the value returned by GetXValue:

COLORREF cr = RGB(64,128,196);  // the original COLORREF
BYTE red = GetRValue(cr);       // the red value in the range 0-255
COLOR16 red16 = red * 256;      // multiply to convert it to the range of COLOR16

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Thanks.

COLORREF colorref = RGB(0x01,0x02,0x03);
TRIVERTEX TriVertex;
TriVertex.Red = (COLOR16)GetRValue(colorref) << 8;
TriVertex.Green = (COLOR16)GetGValue(colorref) << 8;
TriVertex.Blue = (COLOR16)GetBValue(colorref) << 8;

Hello all.

I have a code something like this:

<br />
void CMyDialog::OnLButtonUp(UINT nFlags, CPoint pt)<br />
{<br />
AfxMessageBox(_T("Trace 1"));<br />
EndDialog(IDOK);<br />
AfxMessageBox(_T("Trace 2"));<br />
}<br />

As far as I know, the dialog must end after a call to EndDialog (it is a modal dialog by the way). Thus, it is showing the second message box. Why is this? OMG | :OMG:

Any thoughts will be really appreciated.

Thanks in advance. Regards,

Fernando.

A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site

Even though you've ended processing for the dialog the function still returns and execution
continues on the next line. The return code (IDOK) will eventually be returned from the DoModal()
call that started the dialog.

Also, the docs state:
"EndDialog does not close the dialog box immediately. Instead, it sets a flag that directs the
dialog box to close as soon as the current message handler returns."

Oh, I see. Then what can I do to end the dialog immediately?

Thanks for your reply.

Regards,
Fernando.

A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site

That's the way you should end the dialog. The same thing that happens when you click a
default OK or Cancel button or the ESC key.

The dialog should end quickly and return from the original DoModal() call.
You probably shouldn't do anything else except return after calling EndDialog() since message
handling for the window is essentially done.

What is happening that makes you feel it's not ending fast enough?

Mark

Thanks again for the reply.

The problem is the following. I have a function that is being called from OnLButtonUp. Under determined circumstances, must end the dialog. However, the code is being executed twice... that is, after the EndDialog for some weird reason it is executing the same code again... When it is executed again, it throws me an exception because the dialog has already been destroyed (!).

I think that such problem is caused by remaining messages in the queue or something. I can't figure out what is happening really, and the spy++ is not working.

Tahnks again. Regards,
Fernando.

A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site

That's what I mean...it's not a good idea to do anything after you've called EndDialog().
Even if it's from a nested function - that function shouldn't do anything except return.
Can you return a value from that function indicating that the dialog has been ended? Check
that returned value and if it indicates the dialog has ended then just return.

Mark

Thank you!

Issue solved[^].

Big Grin | :-D

A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site

Put a return statement after the EndDialog().

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ