C / C++ / MFC

jpyp wrote:

Is there any way to "refresh" the environment from within Vic C++ so that the next time I run my program, it picks up the new value?

Mark Salsbery
Microsoft MVP - Visual C++

HKEY hMyKey;
long lResult;
LPDWORD pKeyType = REG_SZ;
LPDWORD pKeySize = 0;
char* strKeyName = "SSSRights";
char* strKeyVal = "\0";

RegOpenKeyEx(HKEY_CURRENT_USER, "Environment", 0, KEY_QUERY_VALUE, &hMyKey);

lResult = RegQueryValueEx(hMyKey, strKeyName, NULL, pKeyType, (LPBYTE)strKeyVal, pKeySize);

RegCloseKey(hMyKey);

HKEY hMyKey;

if (ERROR_SUCCESS == ::RegOpenKeyEx(HKEY_CURRENT_USER, _T("Environment"), 0, KEY_QUERY_VALUE, &hMyKey))
{
   DWORD KeyType;
   DWORD KeySize = 0;
   TCHAR strKeyName[] = _T("SSSRights");

   if (ERROR_SUCCESS == ::RegQueryValueEx(hMyKey, strKeyName, NULL, &KeyType, NULL, &KeySize))
   {
      <code>// Note:  Assumes we KNOW the data type is REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ!!</code>

      TCHAR *pKeyVal = new TCHAR[KeySize / sizeof (TCHAR)];

      ::RegQueryValueEx(hMyKey, strKeyName, NULL, &KeyType, (LPBYTE)pKeyVal, &KeySize);

      // ... do something with the retrieved value (in the pKeyVal array) ...

      delete[] pKeyVal;
   }

   ::RegCloseKey(hMyKey);
}

Mark Salsbery
Microsoft MVP - Visual C++

HKEY hMyKey;
long lResult;
LPDWORD pKeyType = REG_SZ;   <code><-- wrong data type - should be a DWORD
It's also an OUT variable (if used correctly) so initializing it is pointless</code>
LPDWORD pKeySize = 0;  <code><-- wrong data type</code>
char* strKeyName = "SSSRights";
char* strKeyVal = "\0";   <code><-- You need to actually allocate space for the returned characters  
Had the query actually succeeded, it most likely would have crashed 
trying to write data to a const character array of length 1.</code>

jpyp wrote:

Why do I need the first call to RegQueryValueEx? What does it do?

jpyp wrote:

Why does the first call fail when I provide a buffer instead of NULL?

Mark Salsbery
Microsoft MVP - Visual C++

jpyp wrote:

As for the wrong data types, I took those directly from the MSDN library help page. Their data type are LPDWORD for the key type and key size fields.

Mark Salsbery
Microsoft MVP - Visual C++

Megidolaon wrote:

What happened?

Megidolaon wrote:

What happened?

void CClickAndCaptureDlg::OnTimer(UINT_PTR nIDEvent)
{
	if(nIDEvent==ID_TIMER){
		{
			TRACE("Timer arrived\n");
			// Stop the timer
			KillTimer(m_Timer);
		}

		// Get the Active Window
		CWnd* pWnd=GetForegroundWindow();
		if(!pWnd) return;

		// Send messages to the other program
		{
			TRACE("Sending messages\n");
			pWnd->SendMessage(WM_CHAR,'H',0);
			pWnd->SendMessage(WM_CHAR,'E',0);
			pWnd->SendMessage(WM_CHAR,'L',0);
			pWnd->SendMessage(WM_CHAR,'L',0);
			pWnd->SendMessage(WM_CHAR,'O',0);
			pWnd->SendMessage(WM_KEYDOWN,VK_RETURN,0);
		}
	}

	CDialog::OnTimer(nIDEvent);
}

HWND hc=::FindWindow(CString("Notepad"), NULL);
hc=::GetWindow(hc, GW_CHILD);

::SendMessage(hc,WM_KEYDOWN,0x57,0x110001);
::SendMessage(hc,WM_CHAR,0x77,0x110001);
::SendMessage(hc,WM_KEYUP,0x57,0x110001);

Mark Salsbery wrote:

Does it timeout and eventually show or hang forever?

Is it waiting for a reply from a network drive?

TCHAR szFilters[]= _T("MyType Files (*.my)|*.my|All Files (*.*)|*.*||");
CFileDialog fileDlg(TRUE, _T("my"), _T("*.my"),
   OFN_FILEMUSTEXIST | OFN_HIDEREADONLY, szFilters);
if(fileDlg.DoModal() == IDOK)
{
}

Mark Salsbery
Microsoft MVP - Visual C++