C / C++ / MFC Discussion Boards

Re: How does web pages use the ActiveX's function?

DevMentor.org25-Jul-07 9:35

25-Jul-07 9:35

simply create your automation object and call the function!

Your methods defined in IDispatch are exposed by default, if this is not working then you're doing something wrong with your COM object, check your idl, make sure your object has been registered and that you can see the interface using the oleview tool of your registered COM object!

Yours Truly, The One and Only!

Remove Buttons from Command Bar

klarz24-Jul-07 9:48

klarz

24-Jul-07 9:48

I have a project where I would like to remove built-in buttons from the Command Bar of Office applications using the CCommandBar object. If anyone can help it would be greatly appreciated.

GetFileAttributes for folders ?

Maximilien24-Jul-07 8:42

Maximilien

24-Jul-07 8:42

I'm trying to use GetFileAttributes to check if a folder is read-only ( for example, when a user right-click on a folder and select Properties and change the read-only attribute )

this is what I do :

DWORD dwAttr = GetFileAttributes(sPath);
if (dwAttr==INVALID_FILE_ATTRIBUTES)
{
  ASSERT( 0 );
}

if ( (dwAttr & FILE_ATTRIBUTE_DIRECTORY) )
{
  if(dwAttr & FILE_ATTRIBUTE_READONLY)
  {
    // Directory is read-only
    ASSERT( 0 );
  }
}

if I try on a file and it works :

CString sFileName( sPath);
sFileName+="tata.txt";

dwAttr = GetFileAttributes( sFileName );
if(dwAttr & FILE_ATTRIBUTE_READONLY)
{
    ASSERT( 0 );
    // Directory is read-only
}

I assume I'm doing something really stupid, but I cannot see it.

Thanks.

Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: GetFileAttributes for folders ?

Mark Salsbery24-Jul-07 10:08

Mark Salsbery

24-Jul-07 10:08

I'm guessing folders are controlled by an ACL, not the read-only attribute.

You may find these interesting:
You Cannot View or Change the Read-Only or System Attribute of Folders[^]
The Windows Access Control Model Part 1[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: GetFileAttributes for folders ?

David Crow24-Jul-07 10:10

David Crow

24-Jul-07 10:10

So what's the problem? What value does dwAttr have? If there is an error, have you called GetLastError()?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: GetFileAttributes for folders ?

Maximilien25-Jul-07 2:53

Maximilien

25-Jul-07 2:53

GetLastError() returns ERROR_SUCCESS

dwAttr is 0x00000010 ( FILE_ATTRIBUTE_DIRECTORY ), I would have expected the value to be 0x00000011 ( FILE_ATTRIBUTE_DIRECTORY and FILE_ATTRIBUTE_READONLY ).

Anyway, it's not an urgent issue for me or our product.

Thanks.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: GetFileAttributes for folders ?

led mike24-Jul-07 10:19

led mike

24-Jul-07 10:19

Maximilien wrote:
for example, when a user right-click on a folder and select Properties and change the read-only attribute

That has no effect on my XP Professional SP 2 machine I am sending this from. Perhaps this is what Mark is talking about?

Re: GetFileAttributes for folders ?

Mark Salsbery24-Jul-07 11:07

Mark Salsbery

24-Jul-07 11:07

Same here. I can't find anything except comments about the OS ignoring this attribute and/or
using it for a different purpose.

Beats me....I've never had to worry about it Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: GetFileAttributes for folders ?

Paresh Chitte25-Jul-07 2:40

Paresh Chitte

25-Jul-07 2:40

Try using _taccess API.

int _access( const char *path, int mode );
int _waccess( const wchar_t *path, int mode );

path - File or directory path
mode - Permission setting

mode Value Checks File For 
00 Existence only 
02  Write permission 
04 Read permission 
06 Read and write permission

Regards,

Paresh.

Re: GetFileAttributes for folders ?

Maximilien25-Jul-07 3:23

Maximilien

25-Jul-07 3:23

that does not work either; works only for files, for folder it checks only the existence of the folder (see MSDN doc.)

Maximilien Lincourt
Your Head A Splode - Strong Bad

Regsvr32 failed - Invalid access to memory location

tieng8624-Jul-07 6:24

tieng86

24-Jul-07 6:24

Does anyone know the possible reason for the error message "LoadLibrary failed (xxxx.dll)- Invalid access to memory location"? I have a DLL which the same code, I built using VC++ 6.0 one month ago, registered successfully using Regsvr32.exe. Now, I rebuild the same code but when running Regsvr32 to register the newly build .dll and it failed with the message error above.

Between the one month, I installed MS Front Page 2002 and a graphic package to my PC and have ran Windows update once. I thought these might cause the error, so I uninstalled the two new programs and restored my system to the time when the DLL build register successful but the problem remains.

I have also reinstalled MSVC++ and all the other tools with no success....

My colleague, who has the same code, the same setting, can build and register the dll succesfully. If I used his .dll, I can register in my PC but not the one I build. We have the same exact code (source control) and the same copy of the .dsw and .dsp....

Any idea would be greatly appreciated.

Re: Regsvr32 failed - Invalid access to memory location

David Crow24-Jul-07 8:07

David Crow

24-Jul-07 8:07

Does your DLL and your colleague's DLL compare the same? If not, then they are somehow being built differently.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Regsvr32 failed - Invalid access to memory location

tieng8624-Jul-07 9:04

tieng86

24-Jul-07 9:04

We didn't compare when both was working. Now, when my build did not register, we compared, and the size is about 4k diff but we can not figure out why. We've compared every possible setting/system DLL that we can think of...

Re: Regsvr32 failed - Invalid access to memory location

led mike24-Jul-07 10:20

led mike

24-Jul-07 10:20

tieng86 wrote:
but we can not figure out why

Different Platform SDKs?

Re: Regsvr32 failed - Invalid access to memory location

leckey24-Jul-07 8:17

leckey

24-Jul-07 8:17

Have you tried the GetLastWin32Error to see exaclty where it is hanging up?

_____________________________________________
Flea Market! It's just like...it's just like...A MINI-MALL!

Re: Regsvr32 failed - Invalid access to memory location

tieng8624-Jul-07 8:59

tieng86

24-Jul-07 8:59

Thanks for your sugestion but how would I use the API since the dll is registered after the DLL is built successfully or manually registered on a command line outside of code? Also is this API avail in VC++ 6.0? I did some searching but did not find the help for it.

Re: Regsvr32 failed - Invalid access to memory location

leckey24-Jul-07 9:12

leckey

24-Jul-07 9:12

http://msdn2.microsoft.com/en-us/library/system.runtime.interopservices.marshal.getlastwin32error.aspx[^]

Here is a link from Microsoft on how to use it (with C++ example).

If you have set the SetLastError property of the DllImportAttribute then
Platform/Invoke will save the error code set by the failed call to
LoadLibrary().

At least this might help you narrow down where the actual error is.

_____________________________________________
Flea Market! It's just like...it's just like...A MINI-MALL!

Right click on tree control will not select the item

Shay Harel24-Jul-07 6:24

Shay Harel

24-Jul-07 6:24

Hi,

I am using a tree control in a simple GUI.
I responded to a right click on the control and popped up a context menu for it, so far so good.

Next, I want to know which is the HTREEITEM that was selected, so I can do something with it.
The problem is this will work only if the item was first selected by a left click first and then the right click.

If I select an item by docuble click so it will open all of it's sub items and then right click on one of the sub items, the GetSelectedItem function will return me the root item and not the one I right clicked on.

any solution ?

Here are my right click and menu handling functions:

<br />
void Cfbe_sim_guiDlg::OnNMRclickSystemTree(NMHDR *pNMHDR, LRESULT *pResult)<br />
{<br />
	DWORD dwPos=::GetMessagePos();<br />
	CPoint point((int)LOWORD(dwPos),(int)HIWORD(dwPos));//convert mouset to point object<br />
<br />
	CMenu menu;<br />
	menu.LoadMenu(IDR_MENU1);<br />
	CMenu *pContextMenu=menu.GetSubMenu(0);<br />
<br />
	pContextMenu->TrackPopupMenu(TPM_LEFTALIGN|TPM_LEFTBUTTON|TPM_RIGHTBUTTON,<br />
								 point.x,point.y,AfxGetMainWnd(),<br />
								 NULL);<br />
	<br />
	<br />
	*pResult = 0;<br />
}<br />

<br />
void Cfbe_sim_guiDlg::OnTreeObjectproperties()<br />
{<br />
        /*get handle to the selected item*/	<br />
	HTREEITEM selected_item = m_ctl_system_tree.GetSelectedItem();<br />
	<br />
	/*get the text of the selecte item*/<br />
	CString item_text = m_ctl_system_tree.GetItemText (selected_item);	<br />
.<br />
.<br />
.<br />
}<br />

Re: Right click on tree control will not select the item

Mark Salsbery24-Jul-07 6:54

Mark Salsbery

24-Jul-07 6:54

That's by design.

If you want to select the node the cursor is over then you need to do it manually.

Something like this maybe...

// in response to right click notification...
 
POINT ClientCursPoint, ScreenCursPoint;
::GetCursorPos(&ScreenCursPoint);
ClientCursPoint = ScreenCursPoint; // (save ScreenCursPoint for TrackPopupMenu)
::ScreenToClient(m_ctl_system_tree, &ClientCursPoint);
 
TVHITTESTINFO HTInfo;
HTInfo.pt = ClientCursPoint;
HTREEITEM hItem = TreeView_HitTest(m_ctl_system_tree, &HTInfo);
 
if (hItem)
{
...
   TreeView_SelectItem(m_ctl_system_tree, hItem);
}

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Right click on tree control will not select the item

Shay Harel24-Jul-07 7:11

Shay Harel

24-Jul-07 7:11

excellent !

that did the trick,
Thanks a lot

process monitroing

vineeshV24-Jul-07 4:32

vineeshV

24-Jul-07 4:32

how i can monitor the top processes running in a windows machine from remote .
ie ....i need to make a remote task manager for windows ...Can anybody help

vineesh

Re: process monitroing

DevMentor.org24-Jul-07 21:24

DevMentor.org

24-Jul-07 21:24

why not remote desktop in the pc and look at the running process that way?

if you want to develop it yourself you will either need to know tcp/ip or use DCOM to make your task manager

GL

Yours Truly, The One and Only!

Doubt on CString and BSTR LPWSTR

Raj Prathap24-Jul-07 3:03

Raj Prathap

24-Jul-07 3:03

Hi All,
I have on basic doubt.
In windows environment both BSTR and LPWSTR are typedef ed to unsigned short *.
But the contents in that pointer are different. BSTR is a wide char string with length in the first byte. LPWSTR is a null terminated string.
But,

<br />
CString str;<br />
LPWSTR lpw = L"lpwstr";<br />
BSTR bst = AllocSysString("bstr");<br />
str = lpw;  //how at runtime identified whether first char is length or actual data? <br />
str = bsw; //Both of the statements work fine<br />

The code works fine, and behaves as we expect.
My doubt is how at run time the decision on the first byte is decided? i.e whether the first byte is the data or the length?? how the compiler identifies.

Thanks and regards,
Raja Pratap

Re: Doubt on CString and BSTR LPWSTR

CPallini24-Jul-07 4:14

CPallini

24-Jul-07 4:14

Raj Prathap wrote:
But the contents in that pointer are different. BSTR is a wide char string with length in the first byte.

Actually the length field is 4 bytes long.

Raj Prathap wrote:
BSTR bst = AllocSysString("bstr");

The above should be:
BSTR bst = SysAllocString(L"bstr");

Raj Prathap wrote:
The code works fine, and behaves as we expect.
My doubt is how at run time the decision on the first byte is decided? i.e whether the first byte is the data or the length?? how the compiler identifies

The trick is in SysAllocString that returs a pointer to the data string, not to the length prefix, see here http://msdn2.microsoft.com/en-us/library/ms221069.aspx[^] for a better explanation.

Smile | :)

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.

Re: Doubt on CString and BSTR LPWSTR

Raj Prathap24-Jul-07 19:29

Raj Prathap

24-Jul-07 19:29

Thanks. The link provided is really helpful.
I was not clear about the parts of the BSTR i.e length+data+terminator. I used think terminator would not be there since the length is already there. Any ways with the link to MSDN article, all doubts are cleared. Thanks a ton.

/pratap

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.