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Okay... the pointer is to the CString data, not a copy of it, so back to square one...
Am I the only one with nothing better to do on this fine Friday night? 
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How are you handling string length?
If the data you read into the string buffer is NULL terminated, you're OK.
If the data is not NULL terminated, then you should be specifying the actual
string length when you call ReleaseBuffer().
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Thanks,
Fortunately it was as simple as replacing '\n' with '\0' in "p" before ReleaseBuffer(). Unfortunately, my problem has just moved somwhere else, which I'm guessing means that I have other memory leak issues to deal with...
That's ok, I'm sure it builds character or something like that...
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nadiric wrote: That's ok, I'm sure it builds character or something like that...
I like to think so 
Cheers,
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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I have written several Windows applications in C++, and spent time and care on the necessary accompanying helps (---.HLP). I was thus very annoyed to find that Windows Vista has dropped its old help system and replaced it by an incompatible new help system. Please where is software (ownloadable or able to be bought) that can make help files for this new help system?
Why did Windows Vista drop the old help system?
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Hi,
I Don`t know why they removed this.
But using HTML WorkShop You can make *.chm help file.
Create an ID in the Accelerator, then Create an ON_COMMAND(ID, Memfunc())
Call the *.chm help file using ::ShellExecute();
Thanks and Regards.
SANTHOSH V
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Sorry: I am very new to Visual C++: please how do I find the Accelerator, and how do I create an ID in it?
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(vs2003)
choose Resources from View menu
rightclick yout project in resource panel
choose add resource->accelerator
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Hi,
In Resourse View, you can see Dialogs, Icons, Cursors, etc..
There in the Resource Heading right click and select Insert. One Dialog will open there you have to select Accelerator, its a Table having some IDs, Keys and Type.
Give a New ID like IDD_APPHELP, Select Key(F1) from the Combo Box, Selet Type as VIRKEY.
Then use ON_COMMAND(IDD_APPHELP, OnAppHelp())
void CMyApp::OnAppHelp()
{
::ShellExecute( HelpFilename);
}
///
//In the Header add this line.
afx_msg void OnAppHelp();
Thanks and Regards.
SANTHOSH V
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They actually dropped the old help system years ago. Support for it was kept around for
a long time to give us a chance to convert
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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can someone pls help me!!
I am tring to diplay all file in a directory into a text box, but i am getting nothing i dont know what i am doing wrong..I mae a new project and got it to display a txt box, and tried to display fils in it but didnt work
void PlayerDlg::DoDataExchange(CDataExchange* pDX)
{
DDX_Text(pDX, IDC_AUDIOLIST,m_AudioList);
}
BOOL PlayerDlg::OnInitDialog()
{
CDialog::OnInitDialog();
CFileFind finder;
bool bFound;
CListBox *m_AudioList = (CListBox*)this;
static const TCHAR szFileToFine[] = _T("d:\\songs\\*.mp3");
bFound = finder.FindFile(szFileToFine);
if(bFound) {
bFound = finder.FindNextFile();
m_AudioList->AddString(finder.GetFileName());
while(bFound) {
bFound = finder.FindNextFile();
if(bFound) {
m_AudioList->  AddString(finder.GetFileName());
}
}}}
please tell me where am going wrong pls....
Gpat
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void PlayerDlg::DoDataExchange(CDataExchange* pDX)
{
DDX_Text(pDX, IDC_AUDIOLIST,m_AudioList); <-- what is m_AudioList?? Calling DDX_Text()? Why?
}
BOOL PlayerDlg::OnInitDialog()
{
CDialog::OnInitDialog();
CFileFind finder;
bool bFound;
CListBox *m_AudioList = (CListBox*)this; <-- Casting a dialog pointer to a CListBox pointer...bad
static const TCHAR szFileToFine[] = _T("d:\\songs\\*.mp3");
bFound = finder.FindFile(szFileToFine);
if(bFound) {
bFound = finder.FindNextFile();
m_AudioList->AddString(finder.GetFileName());
while(bFound) {
bFound = finder.FindNextFile();
if(bFound) {
m_AudioList-> AddString(finder.GetFileName());
}
}}}
Maybe try making m_AudioList a member variable of the dialog class:
CListBox m_AudioList;
Then use it something like this:
void PlayerDlg::DoDataExchange(CDataExchange* pDX)
{
DDX_Control(pDX, IDC_AUDIOLIST, m_AudioList);
}
BOOL PlayerDlg::OnInitDialog()
{
CDialog::OnInitDialog();
static const TCHAR szFileToFine[] = _T("d:\\songs\\*.mp3");
CFileFind finder;
bool bFound = finder.FindFile(szFileToFine);
while (bFound)
{
bFound = finder.FindNextFile();
m_AudioList->AddString(finder.GetFileName());
}
}
Mark Salsbery
Microsoft MVP - Visual C++
modified on Friday, December 14, 2007 6:10:47 PM
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GPat24 wrote: CListBox *m_AudioList = (CListBox*)this;
It has problem.
GPat24 wrote: DDX_Text(pDX, IDC_AUDIOLIST,m_AudioList);
And also this line.
How did you make listbox control why you dont declare a variable for it and use of it?
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thank guys, tries both solution but no luck, more help would be nice
Gpat
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Hello everyone,
I have an application that uses the web browser ActiveX control that displays content from other users. For security, I would like to restrict the control to only displaying the content by disabling scripting, embedded controls, etc. I'm sure this is possible, but I have not figured out how to do this.
Thanks!
-Joel
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I created a program using visual basic. For some functions the program accesses a dll which was created using visual c++. When the program is run on a computer that does not have visual studio installed, functions which make calls to the dll generate an error:
Unable to load DLL 'filename.dll': This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem. (Exception from HRESULT: 0x800736B1).
Reinstalling the application does not help, and when the program is run on a computer that does have visual studio installed, calls to the dll work as expected without generating any type of error. I even attached and installed all the latest Visual C++ Runtime Libraries, and still no luck.
Is there some component that is installed with Visual Studio that I need to attach to my program installation? Is there some way I can create or access the dll such that it does not need this component?
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You're probably missing the CRT. You could statically link
to the C runtime. Or you can deploy the redistributables...
Deployment (C++)[^]
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Various smart card certificates are imported into the system store. When a smart card is inserted into the reader, the user have to select his certificate from the list of certificates in the sistem and then insert the PIN.
To verify that the certificate selected from the system store correspond to the smart card currently in the reader I try to send a challenge to the smart card (GemPlus CSP)
- A crypto context from the certificate selected from the system store is acquired.
- A crypto context from the smart card in the reader is acquired.
- A challenge is created with random data (CryptGenRandom()).
- The public/private key pair is obtained from the certificate in the system. (CryptGetUserKey(AT_KEYEXCHANGE)).
- The challenge is encrypted with the previous public key from the certificate in the system store (CryptEncrypt()).
- The public/private key pair is obtained from the smart card (CryptGetUserKey(AT_KEYEXCHANGE)).
- The encrypted challenge is decrypted with the smart card (CryptDecrypt(AT_KEYEXCHANGE)) which should use his private key.
But when CryptDecrypt() with the crypto context of the smart card is called, error NTE_PROVIDER_DLL_FAIL (0x8009001D) is obtained.
Where is the error ? NTE_PROVIDER_DLL_FAIL is an error raised when a context is acquired, according to the documentation, but it seems to have no relation with Crypt/Decrypt !
Thanks
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Regards to Cthulhu.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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Nyarlatotep wrote: Where is the error ?
You tell us!
From CryptAcquireContext(), CPAcquireContext():
NTE_PROVIDER_DLL_FAIL( 0x8009001DL )
The provider DLL file could not be loaded or failed to initialize.
Mark Salsbery
Microsoft MVP - Visual C++
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It could be but ... CryptAcquireContext() does not raise this error, it succeeded. It's CryptDecrypt() which fails.
Naturally this function tries (would?) to decrypt data using the AT_KEYEXCHANGE key obtained with CryptGetUserKey() from the context acquired from the smart card.
According to MSDN:
"The CryptGetUserKey function retrieves a handle of one of a user's two public/private key pairs..."
If I'm not wrong CryptoAPI CryptEncrypt()/CryptDecrypt() should use the public key to encrypt and the private key to decrypt, but decrypting with the private key from the smart card fails.
Changhing the key type to AT_SIGNING when retrieving the key pair with CryptGetUserKey() has no effects (and it has not sense for me. I don't want to sign a piece of data with the private key. I want decrypt a piece of data with it ).
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I am looking for a compression algorithm library (zlib or similar) which uses the Intel MMX extensions in order to get the best performance. Any suggestions?
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I'd take a pretty big guess that the limiting factor on compression performance is how fast the data can be pulled in from and written to the disk, and on the performance of the memory buses, not on the core processing performance of the CPU. ZIP deflate isn't a particularly CPU-intensive algorithm.
DoEvents: Generating unexpected recursion since 1991
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Hallo Ladies and Gentlemen,
i have a big Problem whith an EditBox which i have put in a ToolBar of a small SDI Project.
First I will describe what i have done and what is working :
1. I created a new ToolBar with an EditBox and i coud show this control in the project's ToolBar -works-
2. I created a new Button in the -works-
What I want is to fill the EditBox whith values calculated in the Doc.h by clicking the fill button (Btn with the green point).
Every click on the Fill button another value in the EditBix !
The On Fill function is in the Doc.cpp !
But this isn't working !
Pleeese help me, this prob. is really drivin' me crazy ;(
Many, Many Thanx for your help.
Best regards
ShadowEater
In The Doc.cpp:
<br />
void CEditCtrlDoc::OnFill() <br />
{<br />
((CMainFrame*)GetParent())->SetMyToolBarEditText("blabla");<br />
}<br />
<br />
In the Doc.h:
<br />
<br />
#if !defined(AFX_EDITCTRLDOC_H__1C707C4F_EC49_423A_B8EC_3CFE75EDB1AC__INCLUDED_)<br />
#define AFX_EDITCTRLDOC_H__1C707C4F_EC49_423A_B8EC_3CFE75EDB1AC__INCLUDED_<br />
<br />
#if _MSC_VER > 1000<br />
#pragma once<br />
#endif // _MSC_VER > 1000<br />
<br />
<br />
class CEditCtrlDoc : public CDocument<br />
{<br />
protected:
CEditCtrlDoc();<br />
DECLARE_DYNCREATE(CEditCtrlDoc)<br />
<br />
public:<br />
BOOL m_bFill;<br />
<br />
public:<br />
<br />
CString m_TestFlag;<br />
<br />
<br />
public:<br />
virtual BOOL OnNewDocument();<br />
virtual void Serialize(CArchive& ar);<br />
<br />
public:<br />
virtual ~CEditCtrlDoc();<br />
#ifdef _DEBUG<br />
virtual void AssertValid() const;<br />
virtual void Dump(CDumpContext& dc) const;<br />
#endif<br />
<br />
protected:<br />
<br />
protected:<br />
afx_msg void OnUpdateFill(CCmdUI* pCmdUI);<br />
afx_msg void OnFill();<br />
DECLARE_MESSAGE_MAP()<br />
};<br />
<br />
<br />
<br />
#endif // !defined(AFX_EDITCTRLDOC_H__1C707C4F_EC49_423A_B8EC_3CFE75EDB1AC__INCLUDED_)<br />
<br />
Inthe TlBar (the new toolbarclass):
<br />
<br />
#include "stdafx.h"<br />
#include "EditCtrl.h"<br />
#include "TlBar.h"<br />
<br />
<br />
#ifdef _DEBUG<br />
#define new DEBUG_NEW<br />
#undef THIS_FILE<br />
static char THIS_FILE[] = __FILE__;<br />
#endif<br />
<br />
<br />
#define EDITLEN 80 <br />
#define EDITPOS 3 <br />
<br />
<br />
<br />
<br />
CTlBar::CTlBar()<br />
{<br />
m_TestString = "default !!!";<br />
}<br />
<br />
CTlBar::~CTlBar()<br />
{<br />
}<br />
<br />
<br />
BEGIN_MESSAGE_MAP(CTlBar, CToolBar)<br />
ON_CBN_EDITUPDATE (ID_nEDIT, OnUpdateEdit)<br />
ON_CBN_EDITCHANGE (ID_nEDIT, OnChangeEdit)<br />
END_MESSAGE_MAP()<br />
<br />
<br />
<br />
BOOL CTlBar::LoadToolBarEx (UINT id)<br />
{<br />
bool bReturn;<br />
bReturn = CTlBar::LoadToolBar (id);<br />
<br />
int iPosition = CommandToIndex (ID_nEDIT);<br />
<br />
SetButtonInfo (iPosition,ID_nEDIT,TBBS_SEPARATOR,EDITLEN);<br />
<br />
<br />
CRect rect;<br />
GetItemRect (iPosition, &rect);<br />
rect.bottom = 20;<br />
<br />
DWORD dwStyle = WS_CHILD|WS_VISIBLE|WS_TABSTOP|ES_AUTOHSCROLL;<br />
m_Ctrl_EDIT.CreateEx(WS_EX_CLIENTEDGE,_T("EDIT"),NULL, dwStyle, rect, this, ID_nEDIT);<br />
<br />
<br />
m_Ctrl_EDIT.SetWindowText (m_TestString);<br />
return bReturn;<br />
}<br />
<br />
<br />
<br />
void CTlBar::OnUpdateEdit ()<br />
{<br />
AfxMessageBox ("Funktion OnUpdateEdit !!!",MB_OK);<br />
}<br />
<br />
<br />
<br />
void CTlBar::OnChangeEdit()<br />
{<br />
AfxMessageBox ("Funktion OnChangeEdit !!!",MB_OK);<br />
}<br />
In teh TlBar.h:
<br />
#if !defined(AFX_TLBAR_H__1741EA96_4BB2_4E63_8A8A_F21C15ACF84F__INCLUDED_)<br />
#define AFX_TLBAR_H__1741EA96_4BB2_4E63_8A8A_F21C15ACF84F__INCLUDED_<br />
<br />
#if _MSC_VER > 1000<br />
#pragma once<br />
#endif // _MSC_VER > 1000<br />
<br />
<br />
class CTlBar : public CToolBar<br />
{<br />
public:<br />
CTlBar();<br />
<br />
BOOL LoadToolBarEx (UINT id);<br />
public:<br />
<br />
public:<br />
<br />
<br />
public:<br />
virtual ~CTlBar();<br />
<br />
<br />
afx_msg void OnUpdateEdit();<br />
afx_msg void OnChangeEdit();<br />
DECLARE_MESSAGE_MAP()<br />
public:<br />
CEdit m_Ctrl_EDIT;<br />
CString m_TestString;<br />
};<br />
<br />
<br />
<br />
<br />
#endif // AFX_TLBAR_H__1741EA96_4BB2_4E63_8A8A_F21C15ACF84F__INCLUDED_<br />
<br />
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