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Hi Forum
I have problem to write string in text file.I have a file which is create through admin account now i want to write string from lmited user account.I ahve use CStdioFile for create a file.Here is code
if( myFile.Open("C:\\Documents and Settings\\All Users\\Documents\\Adminfile.txt", CStdioFile::modeCreate | CStdioFile::modeWrite | CStdioFile::modeNoTruncate, &e ) )
{
myFile.SeekToEnd();
myFile.WriteString("AdminSting");
myFile.Close();
}
How can i write data in this file?
please help me.
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Boost2010 wrote: I have problem...
...that you've not described. Without knowing what the code snippet is doing, how can we know what to suggest?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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thanks for reply
i am showing code there how i create file and write data.In Fact i am trying to make log file when user plug usb device in system that time i write data in file.I use
odevicechange() for usb device.
Plese help me
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Boost2010 wrote: Plese help me
With what? You've posted twice now and still haven't described the problem. 
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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void CTestDlg::UpdateDevice(PDEV_BROADCAST_DEVICEINTERFACE pDevInf, WPARAM wParam)
{
ASSERT(lstrlen(pDevInf->dbcc_name) > 4);
CString szDevId = pDevInf->dbcc_name+4;
int idx = szDevId.ReverseFind(_T('#'));
ASSERT( -1 != idx );
szDevId.Truncate(idx);
szDevId.Replace(_T('#'), _T('\\'));
szDevId.MakeUpper();
CString szClass;
idx = szDevId.Find(_T('\\'));
ASSERT(-1 != idx );
szClass = szDevId.Left(idx);
CString szLog;
CString szTmp;
if ( DBT_DEVICEARRIVAL == wParam )
{
pendrive++;
if(pendrive==1)
{
}
else
{
szTmp.Format(_T("Adding %s\r\n"), szDevId.GetBuffer());
pendrive=0;
szTmp.Trim();
int nPos=szTmp.Find("_");
CString cyt1=szTmp.Left(szTmp.GetLength()-nPos);
CString cyt2=cyt1.Right(cyt1.GetLength()-nPos-1);
CString fi=cyt2;
int rep=fi.Replace("&PROD_"," ");
int nPon1=fi.Find("&");
final=fi.Left(nPon1);
}
} else
{
pendrive++;
if(pendrive==1)
{
}
else
{
szTmp.Format(_T("Removing %s\r\n"), szDevId.GetBuffer());
szDevId.ReleaseBuffer();
szTmp.Trim();
int nPos=szTmp.Find("_");
CString cyt1=szTmp.Left(szTmp.GetLength()-nPos);
CString cyt2=cyt1.Right(cyt1.GetLength()-nPos-1);
CString fi=cyt2;
int rep=fi.Replace("&PROD_"," ");
int nPon1=fi.Find("&");
CString finalep=fi.Left(nPon1);
char dateStr [9];
char timeStr [9];
_strdate( dateStr);
_strtime( timeStr );
CString date=dateStr;
CString time=timeStr;
CString datatime=date;
datatime+=" ";
datatime+=time;
CStdioFile myFile,myFilereport;
CFileException e;
if( myFile.Open( ""C:\\Documents and Settings\\All Users\\Documents\\Adminfile.txt"", CStdioFile::modeCreate | CStdioFile::modeWrite | CStdioFile::modeNoTruncate, &e ) )
{
myFile.SeekToEnd();
myFile.WriteString("======================================================================================================\n");
myFile.WriteString(" Disconnect infmation");
myFile.WriteString("\n");
myFile.WriteString("======================================================================================================\n");
myFile.WriteString("USB Devidce ID:");
myFile.WriteString(finalep);
myFile.WriteString("\n");
myFile.WriteString("USB Devidce Connection Time:");
myFile.WriteString(datatime);
myFile.WriteString("\n");
myFile.WriteString("======================================================================================================\n");
myFile.WriteString("\n");
}
}
}
szLog.Append(szTmp);
szLog.Trim();
if ( _T("ROOT") == szClass ) {
return;
}
DWORD dwFlag = DBT_DEVICEARRIVAL != wParam ?
DIGCF_ALLCLASSES : (DIGCF_ALLCLASSES | DIGCF_PRESENT);
HDEVINFO hDevInfo = SetupDiGetClassDevs(NULL,szClass,NULL,dwFlag);
if( INVALID_HANDLE_VALUE == hDevInfo ) {
return;
}
SP_DEVINFO_DATA spDevInfoData;
if ( FindDevice(hDevInfo, szDevId, spDevInfoData) ) {
DWORD DataT ;
TCHAR buf[MAX_PATH];
DWORD nSize = 0;
if ( SetupDiGetDeviceRegistryProperty(hDevInfo, &spDevInfoData,
SPDRP_FRIENDLYNAME, &DataT, (PBYTE)buf, sizeof(buf), &nSize) ) {
} else if ( SetupDiGetDeviceRegistryProperty(hDevInfo, &spDevInfoData,
SPDRP_DEVICEDESC, &DataT, (PBYTE)buf, sizeof(buf), &nSize) ) {
} else {
lstrcpy(buf, _T("Unknown"));
}
HTREEITEM hClass = GetClassItem(&(spDevInfoData.ClassGuid), wParam);
if ( NULL == hClass ) return;
HTREEITEM hChildItem = m_ctrlTree.GetChildItem(hClass);
BOOL bFound = FALSE;
while (hChildItem != NULL) {
CString* pszData = (CString*)m_ctrlTree.GetItemData(hChildItem);
if ( szDevId == *pszData ) {
bFound = TRUE;
if ( DBT_DEVICEARRIVAL == wParam ) {
break;
} else {
delete pszData;
m_ctrlTree.DeleteItem(hChildItem);
if ( !m_ctrlTree.ItemHasChildren(hClass) ) {
HeapFree(GetProcessHeap(), 0, (LPVOID)m_ctrlTree.GetItemData(hClass));
m_ctrlTree.DeleteItem(hClass);
}
break;
}
} else {
hChildItem = m_ctrlTree.GetNextItem(hChildItem, TVGN_NEXT);
}
}
if ( DBT_DEVICEARRIVAL == wParam && !bFound ) {
int n = GetClassImgIndex(&(spDevInfoData.ClassGuid));
HTREEITEM hItem = m_ctrlTree.InsertItem(buf, n, n, hClass);
m_ctrlTree.SetItemData(hItem, (DWORD_PTR)(new CString(szDevId)));
m_ctrlTree.Expand(hClass, TVE_EXPAND);
}
}
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You've posted thrice now and still haven't described the problem.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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see my problem i am not able to write data in file when i login in limited user accout.
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Why have you not bothered to check the CFileException object? That might give you a big clue as to what is happening.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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as i know and read some where there i found if file is created through admin then generally limited user cann't write in file.Ony Limited user have read permission.So can i change file attribute for limited user or there is any rule for create a file for all user read and write permission then please help me.
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I have a VC6 project, class-view info file is damaged, VC6 shows:
"Cannot access the ClassView information file, ClassView information will not be available."
when opening its project file.
How to recover the damaged file?
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close ALL your instances of VC6, check in the task manager that there are no ghost instance.
delete all ncb, aps(?), clw, ... files (all support files) from your different solutions; reload you projects and rebuild them all.
Watched code never compiles.
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Yes, I got answer from Google, which says rebooting computer.
It is fine now.
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includeh10 wrote: How to recover the damaged file?
You can't. Just delete the file and let it get rebuilt.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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hi,
Everybody,
i am trying to use parallel port to send data to it using vc++, i have added LED's to know if it works fine.
I have included inpout32.dll in my system32 directory and inpout32.lib is linked to my project, i have even placed inpout32.dll at my projects directory.
When the project executes, it gives no error, but output doesnot appear at LEDs.
please let me know if there are any errors in my code below, or anything that can help me to see output  
#include <conio.h>
#include <stdio.h>
void _stdcall Out32(short PortAddress, short data);
int main () {
Out32(0x378, 255);
printf("DTA SENT");
return 0;
}
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Never having used Out32()... Have you verified that 0x378 is the correct address of the parallel port on your machine (and it is enabled)? Have you ruled out hardware problems, LED's that are backwards, ground(s) not connected...
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Yes jeron
I have made sure all about that, port is enabled, adress is 0x378,
that is only why i am getting nuts. i just cant figure out what is wrong and where is it wrong 
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Thanx It worked 
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Hi all,
I would like to use STL <numeric> adjacent_difference function in my program but I'm getting the error:
1>c:\program files\microsoft visual studio 8\vc\include\numeric(349) : error C2440: '=' : cannot convert from 'Csimple' to 'int'
1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called.
I have a <list> of Csimple's (udt) objects where I would calculate the differences (Csimple is a very simple class with only one int parameter called "firstInt").
list<Csimple> simpleList;
simpleList.push_back(Csimple(10));
...
simpleList.push_back(Csimple(25));
vector<int> res(simpleList.size());
vector<int>::iterator v_resItr;
v_resItr = adjacent_difference(simpleList.begin(), simpleList.end(), res.begin());
I've also added the overloaded version of operator- and operator= as class members as suggest by errors provided by compiler
Csimple Csimple::operator -(Csimple op2)
{ return firstInt - op2.firstInt; }
Csimple Csimple::operator =(Csimple op2)
{ return firstInt = op2.firstInt; }
I assume that I can use adjacent_difference also with user-defined type rather than just int; may be my assumption wrong?
Can someone help me, pls?
Many thanks in advance
modified on Friday, April 2, 2010 7:42 AM
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Try to add an operator to your class :
...
public:
operator int() { return firstInt; };
...
(please see the file of the error:
for (*_Dest = _Val; ++_First != _Last; ))
virtual void BeHappy() = 0;
modified on Friday, April 2, 2010 9:00 AM
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Hi Eugen, your suggestion worked very well
many thanks again 
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We have a window that displays a 2D grid, consisting of points connected by lines to form a rectangular network. The outline is irregular, and the point spacing may vary slightly. This represents an array of shots taken during a geophysical survey. The problem is that for a typical grid from a marine survey the rendering is rather slow, and when the user zooms in or out they must wait several seconds for the screen to update which is not good. Also if the user moves the window, the redraw takes several seconds, which looks a bit crap. Does anyone know if using DirectX would produce faster rendering? If so, what sort of performance gain would we see? Incidentally I assume DirectX 9 as we need to maintain compatibility with Windows XP, if not Win2K.
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unless you have a very large number of points (and/or do a lot of calculations on those points), you should no have that much of an issue with performance even when using straight GDI.
Can you share with us how you display those points ?
Watched code never compiles.
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Maximilien wrote: Can you share with us how you display those points ?
We simply use GDI calls such as LineTo and also for each point there is optionally a label that is output using TextOut or whatever. We do have an issue with performance because of the large number of points. Land surveys are fine, as there are only 100's or even 1000's of points. Marine surveys have maybe 100's of 1000's of points.
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That sounds like something you could do fairly easily in DirectX. This[^] is a useful starting point, and should give you some idea of what is involved.
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