C / C++ / MFC

Re: CComVariant to c-style string

14-Oct-02 20:55

Actually Mike and Nish have wrote an article which "probably" answers that very question...

Index page...check it out... Wink | ;)

http://www.codeproject.com/string/CPPStringGuide2.asp[^]

Cheers! Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Paul M Watt14-Oct-02 20:58

Paul M Watt

14-Oct-02 20:58

There are some ATL conversion macros declared in ATLCONV.h.

You will need to declare USES_CONVERSION; in the function that will be using the conversion macros. THis macro declares a few variables on the stack.

Then you can use OLE2T(bstr) to convert your bstr to your C-Style string. There are a slew of macros to convert from (A)Ansi to (W)widechar, to (bstr)bstr including (c)constants and whatever else. The convention is to use the format that you are going from like (A)ansi then a 2 followed by the format converting to like a (BSTR)bstr. Your final macro would be A2BSTR().

Good Luck

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Change wnd style of a dialog?!?!?

Daniel Strigl14-Oct-02 20:18

Daniel Strigl

14-Oct-02 20:18

Hi!

I am creating a dialog with the Create member function.

So, I would like to change the window styles (like WS_CAPTION, WS_CHILD, ...) before or after creating the dialog!

I want to do like something:

CMyDlg dlg;
dlg.???(...);             // change the dialog style here
dlg.Create(CMyDlg::IDD);
dlg.???(...);             // or here!!!
dlg.ShowWindow(SW_SHOW);

How can I change the window styles, before or after creating the dialog and display it on the screen?

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: Change wnd style of a dialog?!?!?

alex.barylski14-Oct-02 20:37

Re: Change wnd style of a dialog?!?!?

14-Oct-02 20:37

Daniel S. wrote:
How can I change the window styles, before or after creating the dialog and display it on the screen?

I don't think you can change the dialog windows styles before creating it...but you could do it during creation using CreateIndirect() or after using SetClassLong() with GCL_STYLE as a parameter. If my memory serves me correctly and you like doing things the hard way (like me somtimes) you could prolly initialize a WNDCLASS with all the desired WS_??? styles and the call CreateWindowEx() and them somehow the following...

MSDN:

The CreateDialog function uses the CreateWindowEx function to create the dialog box. CreateDialog then sends a WM_INITDIALOG message (and a WM_SETFONT message if the template specifies the DS_SETFONT style) to the dialog box procedure. The function displays the dialog box if the template specifies the WS_VISIBLE style. Finally, CreateDialog returns the window handle to the dialog box.

Just some suggestions... Smile | :)

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Paul M Watt14-Oct-02 21:02

Paul M Watt

14-Oct-02 21:02

Use the ModifyStyle and ModifyStyleex member functions.

The first parameter is the styles that you would like to remove from the window, the second parameter is the style that you would like to add, and the third parameter is related to if you changed a style that affects the borders of the window.

Look in MSDN for more details.

Good Luck.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: Change wnd style of a dialog?!?!?

adamUK15-Oct-02 1:51

adamUK

15-Oct-02 1:51

In my experience, some things don't work with ModifyStyle and ModifyStyleEx.

For example, making the title bar like a toolbar works whereas completely removing it doesn't. The bizzare thing is that for the latter, the window behaves (when you click on it with a mouse) as though the title bar does not exist even when it is still visible (in W2k anyway?!)

it drove me nuts!

Adam.

www.beachwizard.com/travelogue[^]

"I spent a lot of my money on booze, birds and fast cars. The rest I just squandered"
George Best.

How to set File/Dir owner (on NTFS)?

Qiang.Fu14-Oct-02 18:59

Qiang.Fu

14-Oct-02 18:59

<code>
include "stdafx.h"
#include <iostream.h>
#include <windows.h>
#include <tchar.h>

#define ErrorHandler(s) _ErrorHandler(s, __FILE__, __LINE__)

void _ErrorHandler(LPCSTR lpszLocation, LPCTSTR lpszSrcFile, UINT nSrcLine)
{
LPVOID lpMsgBuf;
DWORD dwError = GetLastError();

FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPSTR) &lpMsgBuf,
0,
NULL );

// Process any inserts in lpMsgBuf.
cout<<"ERROR @ "<<lpszLocation<<" : "<<'('<<dwError<<')'<<(LPCSTR)lpMsgBuf;
cout<<"SOURCE @ Line = "<<nSrcLine<<", File = "<<lpszSrcFile<<'\n';

// Free the buffer.
LocalFree( lpMsgBuf );
}

BOOL SetFileOwner(LPCTSTR lpszFileName, LPCSTR lpszAccount, LPCSTR lpszGroup)
{
PSECURITY_DESCRIPTOR pSD;

PSID pSID, pSIDGroup;
DWORD cbSID = 1024;
LPSTR lpszDomain;
DWORD cchDomainName = 80;
PSID_NAME_USE psnuType;

// Initialize a security descriptor.

pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR,
SECURITY_DESCRIPTOR_MIN_LENGTH); // defined in WINNT.H
if (pSD == NULL) {
ErrorHandler("LocalAlloc");
goto Cleanup;
}

if (!InitializeSecurityDescriptor(pSD,
SECURITY_DESCRIPTOR_REVISION)) { // defined in WINNT.H
ErrorHandler("InitializeSecurityDescriptor");
goto Cleanup;
}

// Retrieve the SID for User.

pSID = (PSID) LocalAlloc(LPTR, cbSID);
psnuType = (PSID_NAME_USE) LocalAlloc(LPTR, 1024);
lpszDomain = (LPSTR) LocalAlloc(LPTR, cchDomainName);
if (pSID == NULL || psnuType == NULL ||
lpszDomain == NULL) {
ErrorHandler("LocalAlloc");
goto Cleanup;
}

if (!LookupAccountName((LPSTR) NULL, // local name
lpszAccount,
pSID,
&cbSID,
lpszDomain,
&cchDomainName,
psnuType)) {
ErrorHandler("LookupAccountName");
goto Cleanup;
}

if (!IsValidSid(pSID))
{
ErrorHandler("IsValidSid");
goto Cleanup;
}

// Sets the owner to the SD

if (!SetSecurityDescriptorOwner(pSD, pSID, FALSE)) { // not a default SID
ErrorHandler("SetSecurityDescriptorOwner");
goto Cleanup;
}

// Retrieve the SID for Group.
cbSID = 1024;

pSIDGroup = (PSID) LocalAlloc(LPTR, cbSID);
if (pSIDGroup == NULL) {
ErrorHandler("LocalAlloc");
goto Cleanup;
}

if (!LookupAccountName((LPSTR) NULL, // local name
lpszGroup,
pSIDGroup,
&cbSID,
lpszDomain,
&cchDomainName,
psnuType)) {

pSIDGroup = (PSID)LocalReAlloc((HLOCAL) pSIDGroup, cbSID, LPTR);
lpszDomain = (LPSTR) LocalReAlloc((HLOCAL) lpszDomain, cchDomainName, LPTR);
if (pSIDGroup == NULL || lpszDomain == NULL) {
ErrorHandler("LocalReAlloc");
goto Cleanup;
}

if (!LookupAccountName((LPSTR) NULL, // local name
lpszGroup,
pSIDGroup,
&cbSID,
lpszDomain,
&cchDomainName,
psnuType)) {
ErrorHandler("LookupAccountName");
goto Cleanup;
}
}

if (!IsValidSid(pSIDGroup))
{
ErrorHandler("IsValidSid");
goto Cleanup;
}

// Sets the group to the SD
if (!SetSecurityDescriptorGroup(pSD, pSIDGroup, FALSE)) { // not a default SID
ErrorHandler("SetSecurityDescriptorGroup");
goto Cleanup;
}

// Use the new SD as the file's security info.
if (!SetFileSecurity(lpszFileName, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION, pSD)) {
ErrorHandler("SetFileSecurity");
goto Cleanup;
}

return TRUE;

Cleanup:
FreeSid(pSID);
FreeSid(pSIDGroup);

if(pSD != NULL)
LocalFree((HLOCAL) pSD);
if(psnuType != NULL)
LocalFree((HLOCAL) psnuType);
if(lpszDomain != NULL)
LocalFree((HLOCAL) lpszDomain);

return FALSE;
}

int _tmain(int argc, TCHAR *argv[], TCHAR *envp[])
{
if (argc < 4) {
cout<<"ERROR @ main : Not enough parameters\n";
return 0;
}

TCHAR tszFileName[MAX_PATH];
char szUserName[256];
char szGroupName[256];

_tcscpy(tszFileName, argv[1]);

#if defined(_UNICODE) || defined(UNICODE)
if (!WideCharToMultiByte(CP_ACP, 0, argv[2], -1, szUserName, 256, NULL, NULL)) {
ErrorHandler("WideCharToMultiByte");
return 0;
}
if (!WideCharToMultiByte(CP_ACP, 0, argv[3], -1, szGroupName, 256, NULL, NULL)) {
ErrorHandler("WideCharToMultiByte");
return 0;
}
#else
strcpy(szUserName, argv[2]);
strcpy(szGroupName, argv[3]);
#endif

if (!SetFileOwner(tszFileName, szUserName, szGroupName)) {
cout<<"Operation Failed!\n";
return 0;
}

cout<<"Operation Succeeded!\n";
return 0;
}
</code>

=======================================================================
This program can set file and dir owner for "administrator"
or "administrators", but can't set for other user, else return
the "ERROR_INVALID_OWNER(1703L)"...
Why??? Please help me ~!!!
=======================================================================

Re: How to set File/Dir owner (on NTFS)?

Anonymous15-Oct-02 22:22

Anonymous

15-Oct-02 22:22

SOS

How to DrawText on top of child window?

Hiusing14-Oct-02 18:39

Hiusing

14-Oct-02 18:39

Hello,
I would like to use DrawText on top of my application window. The window itself contains a child window. How do I use DrawText on top of both window? I can draw it directly to the screen DC but it's hard to prevent drawing to other windows not belong to my window when my application is partially covered by other application. I also tried to SetWindowLong(m_hParent, GWL_STYLE, GetWindowLong(GWL_STYLE) & ~WS_CLIPCHILDREN); but the text still covered by the child window. Do you have solution for this problem?

Thanks,
Hiusing

Re: How to DrawText on top of child window?

alex.barylski14-Oct-02 20:49

14-Oct-02 20:49

Why not just use the childs DC...??

Obviously i am misunderstanding something...you want to draw overtop of both windows child and parent but also want to make whatever the parent contains visible through the child also...?

MSDN:

If WS_CLIPSIBLINGS is not specified and child windows overlap, it is possible, when drawing within the client area of a child window, to draw within the client area of a neighboring child window.

WS_CLIPSIBLINGS won't do what you desire I don't think

Perhaps create the child window with a NULL brush, this way everything underneath remains visible...

MSDN:

CS_PARENTDC Sets the clipping region of the child window to that of the parent window so that the child can draw on the parent. A window with the CS_PARENTDC style bit receives a regular device context from the system's cache of device contexts. It does not give the child the parent's device context or device context settings. Specifying CS_PARENTDC enhances an application's performance. For more information, seeDevice Contexts.

This might give you the desired effect also so long as your child window returns FALSE in OnEraseBkgnd()

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

UI Thread question

RobJones14-Oct-02 16:55

RobJones

14-Oct-02 16:55

Hello,
I am trying to create a UI thread and use CSocket with in the thread to do a file transfer. I have created my own CWinThread class and a CSocket Class..

I keep getting a error when I try to create the socket inside of the thread.

Here is the error, in debug mode..

void* CMapPtrToPtr::GetValueAt(void* key) const
// find value (or return NULL -- NULL values not different as a result)
{
	if (m_pHashTable == NULL)<-- HERE
		return NULL;

	UINT nHash = HashKey(key) % m_nHashTableSize;

	// see if it exists
	CAssoc* pAssoc;
	for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext)
	{
		if (pAssoc->key == key)
			return pAssoc->value;
	}
	return NULL;
}

In my InitInstance() inside the thread i do a..

BOOL CFtThread::InitInstance()
{
	if(!AfxSocketInit())
		return FALSE;
	
	return TRUE;
}

and in my "int CFtThread::Run()" I try to Create the socket, thats when I get the error..

Here is how I am trying to create the thread in my main app.. maybe this has something to do with it..

////////////////////////////////////////////////////////////////////////
// Create the UI Thread for file transfer
CFtThread* pThread = (CFtThread*)AfxBeginThread(RUNTIME_CLASS(CFtThread),
			THREAD_PRIORITY_NORMAL, 0, CREATE_SUSPENDED);

		pThread->m_strAddress = pView->m_strClientDns;
		pThread->m_nPort = 21;
		pThread->m_strFile = strFilePath;
		pThread->m_bAutoDelete = TRUE;
		pThread->ResumeThread();
// End of Thread
////////////////////////////////////////////////////////////////////////

I have seen posts at articles on CodeProject that say that the AfxSocketInit() fixed their problems but I am still having the problem...

Thanks in advance!!

Known bug..

Anonymous15-Oct-02 4:55

Anonymous

15-Oct-02 4:55

I just found the answer to my question on microsofts site.. so if anyone else sees this problem heres the work around..

http://support.microsoft.com/default.aspx?scid=kb;EN-US;q193101

Rob

HELP PLZ

B4u14-Oct-02 16:41

B4u

14-Oct-02 16:41

hi evryone,

i m a beginer VC++ prog.
i have to make a prjct in VC++ for my college project whch will allow access to all desktops in a LAN.
i want to know abt the features reqd to implemnet it and any reference help if avlble.

THNX for any help

find of STL

IMiracle14-Oct-02 15:23

14-Oct-02 15:23

I have a code statements using STL and CString of MFC:

#include <vector>
#include <afx.h>

vector<CString> strs;
vector<CString>::iterator pos;
pos = find(m_lstPy.begin() + nIndexStart, m_lstPy.end(), lpszFind); // Error line
....

The building error:
error C2440: '=' : cannot convert from 'const class CString *' to 'class CString *' Conversion loses qualifiers

C^hris L^osinger14-Oct-02 15:41

C^hris L^osinger

14-Oct-02 15:41

try this:

CString temp = lpszFind;
pos = find(m_lstPy.begin() + nIndexStart, m_lstPy.end(), temp);

or

pos = find(m_lstPy.begin() + nIndexStart, m_lstPy.end(), &temp);

-c

Green's Law of Debate:
Anything is possible if you don't know what you're talking about.

Smaller Animals Software

IMiracle14-Oct-02 16:20

14-Oct-02 16:20

the problem is exist yet!!

Please test your code befer place it here!!!

C^hris L^osinger14-Oct-02 16:25

C^hris L^osinger

14-Oct-02 16:25

IMiracle wrote:
Please test your code befer place it here!!!

yes i did. here is the entire program that i used to test it:

// mfcmfmcc.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "mfcmfmcc.h"
#include <vector>
#include <algorithm>
#include <afx.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
	int nRetCode = 0;

	// initialize MFC and print and error on failure
	if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
	{
		// TODO: change error code to suit your needs
		cerr << _T("Fatal Error: MFC initialization failed") << endl;
		nRetCode = 1;
	}
	else
	{


   vector<CString> strs;
   vector<CString>::iterator pos;
   const char * lpszFind = "hi";
   pos = find(strs.begin(), strs.end(), lpszFind); // Error line
	}

	return nRetCode;
}

the problem is apparently not in the code you're showing us.

-c

Green's Law of Debate:
Anything is possible if you don't know what you're talking about.

Smaller Animals Software

IMiracle14-Oct-02 19:43

14-Oct-02 19:43

Thank you!

What is about mfcmfmcc.h and mfcmfmcc.cpp

IMiracle15-Oct-02 1:34

15-Oct-02 1:34

That code is in a MFC Application;

retrieving locations of icons/shortcuts on desktop?

C^hris L^osinger15-Oct-02 4:18

C^hris L^osinger

15-Oct-02 4:18

so was the code i posted.

Green's Law of Debate:
Anything is possible if you don't know what you're talking about.

Smaller Animals Software

Anonymous14-Oct-02 12:46

Anonymous

14-Oct-02 12:46

Does anyone know how to retrieve the location of all the icons and shortcuts on the desktop? My program needs to change the display settings at runtime, which may cause icons to be moved around on the Desktop. Once the program is closed, I'd like to restore all the icons and shortcuts to their original locations on the Desktop.

Re: retrieving locations of icons/shortcuts on desktop?

alex.barylski14-Oct-02 20:39