C / C++ / MFC

Re: how to capture mouse movement and click in windows service

11-May-22 21:43

Windows service applications do not have consoles so have no access to input or output devices.

Richard Deeming11-May-22 21:44

Richard Deeming

11-May-22 21:44

Windows services don't run in the context of a user's desktop. At any point whilst the service is running, there could be zero, one, or many users logged in to the computer, each with their own desktop.

You need to use a different solution. For example, you can use the Windows Task Scheduler to start an application when any user logs in. That application will have access to the user's desktop.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

conflicting types for 'uint32_t' issue

focusdoit5-May-22 3:17

focusdoit

5-May-22 3:17

I got the conflicting types error when I built the code, while, i searched the workspace, i only found one tyepdef,
Shrink ▲ Copy Code
typedef unsigned int uint32_t;

in Eclipse, search:typedef*uint32_t

i can't find where there is another typedef * uint32_t.

Please help to give some ideas.

Richard MacCutchan5-May-22 4:02

5-May-22 4:02

focusdoit wrote:
Please help to give some ideas.

Show the code that has the problem, and the exact error message(s).

Randor 5-May-22 9:28

Randor

5-May-22 9:28

focusdoit wrote:
Please help to give some ideas.

The error message implies that you are calling a function that expected a uint32_t so check the function signature of every function you are calling.

I don't understand why nearly everyone that posts a question omits pertinent information. It would really help if you posted relevant code and error messages.

focusdoit5-May-22 14:04

focusdoit

5-May-22 14:04

Thanks, it's a big project,
i found the issue,

  new 1 (33 hits)
XXX_Global.h: error: conflicting types for 'uint32_t'
	Line 17:  typedef unsigned int    uint32_t;
gcc-6.3-arm32-eabi\arm-none-eabi\include\sys\_stdint.h:48:20: note: previous declaration of 'uint32_t' was here
	Line 24:  typedef __uint32_t uint32_t ;

there are 2 tyepdef uint32_t

Randor 5-May-22 14:31

Randor

5-May-22 14:31

focusdoit wrote:
i found the issue

I'm happy to see you made progress. It's unusual to ask this type of basic question, you should change the variable type on those function calls to uint32_t and recompile.

It would be great if you revealed the source code. You are forcing anyone that assists you to speculate.

Richard MacCutchan5-May-22 22:23

Complier error C2280 explanation

5-May-22 22:23

Then remove the one from XXX_Global.h.

ForNow5-May-22 1:37

5-May-22 1:37

Hi

I have the following collection class (referencing a struct) which is causing the complier error listed below

I ended writing my own link list becuase I couldnt resolve the issue however I am hoping that by posting this someone can maybe explain it to me

so here is the code

listed below is the complier error for some reason the complier doesnt like a Clist template in a struct

C++

C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\atlmfc\include\afxtempl.h(954,17): error C2280: 'CStorge::buildcombo::tcbholder &CStorge::buildcombo::tcbholder::operator =(const CStorge::buildcombo::tcbholder &)': attempting to reference a deleted function

C++

struct stdecs
	{
		struct vsmdesc stordesc;
		char* tcb;
		struct blkdesc *ablkdescx;
		struct blkdesc *fblkdescx;
		struct stdecs* nextdecs;
	
	};
	struct tcbholder
	{  
		char* tcb;
		char programname[8];
		struct stdecs *storageptr;
		CList<stdecs, stdecs> stptr;

	};

CPallini5-May-22 1:59

CPallini

5-May-22 1:59

CList features a deleted copy contructor.
Microsoft folks think it is not useful to pass collections by value.
You could use std::list instead (I believe Microsoft folks themselves recommend std::list over CList).

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

ForNow5-May-22 2:07

5-May-22 2:07

Thanks let me look it up

CPallini5-May-22 2:10

CPallini

5-May-22 2:10

You are welcome.

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

ForNow5-May-22 2:21

5-May-22 2:21

Still get error with list me thinks it has to do that I declared stdecs just as a type without actually allocating storage i.e struct stdecs storagediscriptor; when I have the template outside of a struct it compiles thanks

CPallini5-May-22 2:34

CPallini

5-May-22 2:34

This works for me:

C++

#include <iostream>
#include <list>
using namespace std;

struct Foo
{
  list <int> foolist;
};


int main()
{
  Foo f1;
  f1.foolist.push_back(5);
  f1.foolist.push_back(7);
  Foo f2 = f1;
  for (auto i: f2.foolist)
    cout << i << " ";
  cout <<  "\n";
}

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

ForNow5-May-22 3:01

cannot Create CListBox : CFormView without IDD

5-May-22 3:01

Get clean build seems to do more than clist thanks

rtischer82774-May-22 4:04

rtischer8277

4-May-22 4:04

I cannot create MyListBox derived from CFormView. The docs say I can put the Create call in the MyListBox ctor.
I get these errors:
// dialog template must exist and be invisible with WS_CHILD set
// invalid dialog template name
I don't want to create a resource dialog template, however, like an IDD_... because my listbox is just a PLACE_HOLDER control in a resource control.
How do I get the object created without a dialog resource IDD?

Re: cannot Create CListBox : CFormView without IDD

David Crow4-May-22 4:47

David Crow

4-May-22 4:47

What does the relevant code look like?

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WaitForSingleObject Visual C++ bug

coco2431-May-22 8:35

coco243

1-May-22 8:35

Hi,

I am following an example from a book, and I have an WaitForSingleObject that works just first time and I don't know
how to resolve that.

The main things are happening in the ChildThreadProc. At the first execution of the ChildThreadProc the procedure steps through all lines of code, but when is launched again, the execution stops at WaitForSingleObject, as if hAutoEvent isn't signaled or I don't know what is happening, and please help me to figure this out.

So,
In the WindProc main procedure when the window is created, is created the Event also:

C++

case WM_CREATE:  // Make an auto-reset event with initial state of signaled
	    hAutoEvent = CreateEvent ( NULL, FALSE, TRUE, "EXAMPLE-AUTOEVENT" );
		return DefWindowProc(hWnd, message, wParam, lParam);

The example of WaitForSingleObject is presented in the following procedure:

C++

// Child thread procedure. The child waits to get event. It then sits idle
// for five seconds and sets the event again so another thread can use it.

DWORD WINAPI ChildThreadProc ( HWND hWnd )
{
	char szBuffer[256];   //work area for print formatting
	HANDLE hAutoEvent = OpenEvent( SYNCHRONIZE, FALSE, "EXAMPLE-AUTOEVENT");
	wsprintf(szBuffer, "Thread %x waiting for Event %x", GetCurrentThreadId(), hAutoEvent );
	SendMessage(hWnd, WM_USER, 0, (LPARAM)szBuffer);

	// Check that write auto reset is signaled.
	WaitForSingleObject(hAutoEvent, INFINITE );
	wsprintf(szBuffer, " Thread %x got event", GetCurrentThreadId() );
	SendMessage(hWnd, WM_USER, 0, (LPARAM)szBuffer );
	Sleep(2000);

	//Release event
	wsprintf(szBuffer, "Thread %x is dome with event", GetCurrentThreadId() );
	SendMessage(hWnd, WM_USER, 0, (LPARAM)szBuffer);
	SetEvent(hAutoEvent);
	CloseHandle( hAutoEvent);
	ExitThread( TRUE );

The ChildThreadProc is started here:

C++

case IDM_TEST:
			{
				DWORD id=0;
				CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)ChildThreadProc, hWnd, 0, &id );
			}
			break;

and here is where text out is handled:

C++

case WM_USER:
		{
			TCHAR szBuffer[101];
			static int row = 0;
			static int msg_num = 1;

			HDC hDC = GetDC(hWnd);

			FillMemory(szBuffer, 100, 32 );
			TextOut( hDC, 0, row, szBuffer, 100 );
			wsprintf(szBuffer, "%3d: %s", msg_num++, (LPSTR)lParam );
			TextOut(hDC, 0, row, szBuffer, lstrlen(szBuffer) );
            row = (row > 200 ) ? 0 : row += 20;
			ReleaseDC(hWnd,hDC);

		}
		break;

Please help me to find what I am not doing right.

Thank you,

Randor 1-May-22 10:22

Randor

1-May-22 10:22

coco243 wrote:
execution stops at WaitForSingleObject, as if hAutoEvent isn't signaled or I don't know what is happening

coco243 wrote:
Please help me to find what I am not doing right.

It's not signaled on the second pass. You are using an Auto-Reset event object. So when your ChildThreadProc thread exits the event goes back into a nonsignaled state. The operating system is managing this for you.

Event Objects (Synchronization) - Win32 apps | Microsoft Docs[^]

You could change to a manual signal and set/reset it yourself.

Best Wishes,
-David Delaune

coco2434-May-22 5:43

coco243

4-May-22 5:43

Thank you, I had made the event with manual reset and I had understood what it was to be understanded.

In additon, the main significant thing that I had catched it, it was that when the thread was exiting, even if I was signaled the event before exiting from thread:

C++

SetEvent(hAutoEvent);

, the system automaticaly was unsigning the event.
Very tricky for me, I woldn't figured out by myself neither in 100 year, so,

Thank you very much,

Randor 4-May-22 8:02

Randor

4-May-22 8:02

coco243 wrote:
I woldn't figured out by myself neither in 100 year

You are doing an amazing job. I would be completely lost if I were forced to read Romanian documentation. I checked and unfortunately the MSDN isn't available in your native tongue. Event Objects (Romanian)[^]

One DrawItem Function for both CStatic and CComboBox

coco2434-May-22 9:19

coco243

4-May-22 9:19

Thank you,

With a little English, with a little will, maybe something came out.

Thank you again for your help,

ForNow30-Apr-22 15:11

Re: One DrawItem Function for both CStatic and CComboBox

30-Apr-22 15:11

Hi

is there a way to have one DrawItem Function if you have both a derived CStatic and CComboBox a function pointer to the drawitem function.

The Function itself takes into consideration both a static and combbox.

Not sure because the complier looks to see if you decalred a Drawitem for either a static or combobox

Richard MacCutchan30-Apr-22 21:06