Change style of window owned by another app in 98? Works in XP.
-
I need to modify the style of a window owned by another application under Windows 98/ME and XP/2000. I can get it to work under XP, but not 98. Windows XP In XP (and hopefully 2000) the following code works:
DWORD dwStyle, dwError;
// Get and modify a window's style.
if (dwStyle = GetWindowLongPtr (hWnd, GWL_STYLE))
{
dwStyle &= ~(WS_TILEDWINDOW | WS_CHILD | WS_POPUP);
dwStyle |= WS_BORDER | WS_OVERLAPPED;
SetLastError (0);
if (0 == SetWindowLongPtr (hWnd, GWL_STYLE, dwStyle) && 0 != (dwError = GetLastError ()))
{
CString csMess;csMess.Format ("SetWindowLongPtr Failed: %lX", dwError); AfxMessageBox (csMess, MB\_ICONSTOP);}
}To make this work in XP I first have to set some privileges as below:
bool CTools::SetPrivileges ()
{
bool bRet = false;
HANDLE hToken;if (OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES, &hToken))
{
TOKEN_PRIVILEGES tPriv;tPriv.PrivilegeCount = 1; if (LookupPrivilegeValue ("", SE\_DEBUG\_NAME, &tPriv.Privileges\[0\].Luid)) { tPriv.Privileges\[0\].Attributes = SE\_PRIVILEGE\_ENABLED; if (AdjustTokenPrivileges (hToken, FALSE, &tPriv, NULL, NULL, NULL) && GetLastError() == ERROR\_SUCCESS) bRet = true; } CloseHandle (hToken);}
return bRet;
}Windows 98 Under Windows 98 these don't work. SetWindowLongPtr returns 0 (usually non-zero when it works) but GetLastError returns 0 too. More importantly, the style doesn't change. GetWindowLongPtr does work though. There may be a permissions problem in 98 like there was in XP but SetPrivileges is not relevant to 98. Documentation does say: "Windows 95/98/Me: The SetWindowLong function may fail if the window specified by the hWnd parameter does not belong to the same process as the calling thread." I also tried this, without success in 98 or XP (even with priveleges set):
CWnd::ModifyStyle (hWnd, WS_TILEDWINDOW | WS_CHILD | WS_POPUP, WS_BORDER | WS_OVERLAPPED, 0);
In XP it indicates failure with it's return value. In 98 it pretends to work but the style doesn't change. Does anyone know another way to change a windows style? I don't know what to do to set the style of a window my application doesn't own under Win 98. Any ideas? Thanks in advance! Alex Gibbs
-
I need to modify the style of a window owned by another application under Windows 98/ME and XP/2000. I can get it to work under XP, but not 98. Windows XP In XP (and hopefully 2000) the following code works:
DWORD dwStyle, dwError;
// Get and modify a window's style.
if (dwStyle = GetWindowLongPtr (hWnd, GWL_STYLE))
{
dwStyle &= ~(WS_TILEDWINDOW | WS_CHILD | WS_POPUP);
dwStyle |= WS_BORDER | WS_OVERLAPPED;
SetLastError (0);
if (0 == SetWindowLongPtr (hWnd, GWL_STYLE, dwStyle) && 0 != (dwError = GetLastError ()))
{
CString csMess;csMess.Format ("SetWindowLongPtr Failed: %lX", dwError); AfxMessageBox (csMess, MB\_ICONSTOP);}
}To make this work in XP I first have to set some privileges as below:
bool CTools::SetPrivileges ()
{
bool bRet = false;
HANDLE hToken;if (OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES, &hToken))
{
TOKEN_PRIVILEGES tPriv;tPriv.PrivilegeCount = 1; if (LookupPrivilegeValue ("", SE\_DEBUG\_NAME, &tPriv.Privileges\[0\].Luid)) { tPriv.Privileges\[0\].Attributes = SE\_PRIVILEGE\_ENABLED; if (AdjustTokenPrivileges (hToken, FALSE, &tPriv, NULL, NULL, NULL) && GetLastError() == ERROR\_SUCCESS) bRet = true; } CloseHandle (hToken);}
return bRet;
}Windows 98 Under Windows 98 these don't work. SetWindowLongPtr returns 0 (usually non-zero when it works) but GetLastError returns 0 too. More importantly, the style doesn't change. GetWindowLongPtr does work though. There may be a permissions problem in 98 like there was in XP but SetPrivileges is not relevant to 98. Documentation does say: "Windows 95/98/Me: The SetWindowLong function may fail if the window specified by the hWnd parameter does not belong to the same process as the calling thread." I also tried this, without success in 98 or XP (even with priveleges set):
CWnd::ModifyStyle (hWnd, WS_TILEDWINDOW | WS_CHILD | WS_POPUP, WS_BORDER | WS_OVERLAPPED, 0);
In XP it indicates failure with it's return value. In 98 it pretends to work but the style doesn't change. Does anyone know another way to change a windows style? I don't know what to do to set the style of a window my application doesn't own under Win 98. Any ideas? Thanks in advance! Alex Gibbs
I don't know which version of MFC you're using, but CWnd::ModifyStyle doesn't have a parameter for window handles. According to Microsoft documentation (msdn.microsoft.com/library/default.asp), the function is defined as: BOOL ModifyStyle(DWORD dwRemove, DWORD dwAdd, UINT nFlags = 0); So you don't need a window handle, just a CWnd pointer to the application in question (I don't know how to do that myself, but I'm sure other forum members can help):suss:.
-
I don't know which version of MFC you're using, but CWnd::ModifyStyle doesn't have a parameter for window handles. According to Microsoft documentation (msdn.microsoft.com/library/default.asp), the function is defined as: BOOL ModifyStyle(DWORD dwRemove, DWORD dwAdd, UINT nFlags = 0); So you don't need a window handle, just a CWnd pointer to the application in question (I don't know how to do that myself, but I'm sure other forum members can help):suss:.
I too saw that only the one you mentioned is documented. I found the other when Dev Studio showed two forms to choose from when I was typing it in. Going to the declaration takes you to afxwin.h in the CWnd declaration: static BOOL PASCAL ModifyStyle(HWND hWnd, DWORD dwRemove, DWORD dwAdd, UINT nFlags); which of course also has: BOOL ModifyStyle(DWORD dwRemove, DWORD dwAdd, UINT nFlags = 0); I tried both forms under 98 and neither worked. Both now work in XP though. At least it was another thing to try. :) Alex Gibbs
-
I need to modify the style of a window owned by another application under Windows 98/ME and XP/2000. I can get it to work under XP, but not 98. Windows XP In XP (and hopefully 2000) the following code works:
DWORD dwStyle, dwError;
// Get and modify a window's style.
if (dwStyle = GetWindowLongPtr (hWnd, GWL_STYLE))
{
dwStyle &= ~(WS_TILEDWINDOW | WS_CHILD | WS_POPUP);
dwStyle |= WS_BORDER | WS_OVERLAPPED;
SetLastError (0);
if (0 == SetWindowLongPtr (hWnd, GWL_STYLE, dwStyle) && 0 != (dwError = GetLastError ()))
{
CString csMess;csMess.Format ("SetWindowLongPtr Failed: %lX", dwError); AfxMessageBox (csMess, MB\_ICONSTOP);}
}To make this work in XP I first have to set some privileges as below:
bool CTools::SetPrivileges ()
{
bool bRet = false;
HANDLE hToken;if (OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES, &hToken))
{
TOKEN_PRIVILEGES tPriv;tPriv.PrivilegeCount = 1; if (LookupPrivilegeValue ("", SE\_DEBUG\_NAME, &tPriv.Privileges\[0\].Luid)) { tPriv.Privileges\[0\].Attributes = SE\_PRIVILEGE\_ENABLED; if (AdjustTokenPrivileges (hToken, FALSE, &tPriv, NULL, NULL, NULL) && GetLastError() == ERROR\_SUCCESS) bRet = true; } CloseHandle (hToken);}
return bRet;
}Windows 98 Under Windows 98 these don't work. SetWindowLongPtr returns 0 (usually non-zero when it works) but GetLastError returns 0 too. More importantly, the style doesn't change. GetWindowLongPtr does work though. There may be a permissions problem in 98 like there was in XP but SetPrivileges is not relevant to 98. Documentation does say: "Windows 95/98/Me: The SetWindowLong function may fail if the window specified by the hWnd parameter does not belong to the same process as the calling thread." I also tried this, without success in 98 or XP (even with priveleges set):
CWnd::ModifyStyle (hWnd, WS_TILEDWINDOW | WS_CHILD | WS_POPUP, WS_BORDER | WS_OVERLAPPED, 0);
In XP it indicates failure with it's return value. In 98 it pretends to work but the style doesn't change. Does anyone know another way to change a windows style? I don't know what to do to set the style of a window my application doesn't own under Win 98. Any ideas? Thanks in advance! Alex Gibbs
Here is an update. I can modify another window's style under XP using any of the calls below, if the priveleges are set as mentioned in the first post:
SetWindowLongPtr (hWnd, GWL_STYLE, dwStyle); CWnd::ModifyStyle (hWnd, dwRemove, dwAdd, 0); pCWnd->ModifyStyle (dwRemove, dwAdd);However, none of them change the visible appearance of a window under 98. Remember I am trying to change the window of another process. I think the problem is one of priveleges/permissions in 98. I found something else that might be relevant at MSDN, but I don't think it is the problem. MSDN Article, 5th paragraph: "Windows 95/98/Me automatically adds and removes the WS_EX_WINDOWEDGE style for windows in all applications. ..." Anyone able to help with priveleges/permissions in 98? Alex Gibbs -
Here is an update. I can modify another window's style under XP using any of the calls below, if the priveleges are set as mentioned in the first post:
SetWindowLongPtr (hWnd, GWL_STYLE, dwStyle); CWnd::ModifyStyle (hWnd, dwRemove, dwAdd, 0); pCWnd->ModifyStyle (dwRemove, dwAdd);However, none of them change the visible appearance of a window under 98. Remember I am trying to change the window of another process. I think the problem is one of priveleges/permissions in 98. I found something else that might be relevant at MSDN, but I don't think it is the problem. MSDN Article, 5th paragraph: "Windows 95/98/Me automatically adds and removes the WS_EX_WINDOWEDGE style for windows in all applications. ..." Anyone able to help with priveleges/permissions in 98? Alex GibbsIt's possible that the window of another process "undos" any changes made to it. I know of some programmers who put code in their MFC applications to prevent certain window style changes. I believe the Windows Media Player exhibits this behaviour. If this other process is of your own creation, then you may want to use user-defined messages to invoke certain behaviour.