C / C++ / MFC

Re: Invalid application of 'sizeof' to incomplete type 'struct Node'

22-Aug-23 21:06

The error message is clear: at the point the compiler encounters sizeof(struct Node) (or sizeof(nd), or whatever...) it doesn't know the size, because the complete declaration of struct Node is missing.
You could post the relevant code, in order to get better help.

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

ThatsAlok23-Aug-23 17:01

ThatsAlok

23-Aug-23 17:01

Still here Smile | :)

CPallini23-Aug-23 19:59

Re: Invalid application of 'sizeof' to incomplete type 'struct Node'

23-Aug-23 19:59

It's been a while...
Nice to see you again.
How do you do?

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

ZAID razvi24-Aug-23 23:43

ZAID razvi

24-Aug-23 23:43

Thanks sir it helped me alot

Re: Invalid application of 'sizeof' to incomplete type 'struct Node'

CPallini24-Aug-23 23:47

conversions in 64 bit mode

24-Aug-23 23:47

You are welcome.

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

utcode21-Aug-23 18:35

utcode

21-Aug-23 18:35

in visual studio c++ / x64:
what are way safest to convert from:
1.INT_PTR to int?
2.LRESULT to BOOL?
3.LRESULT to int?

CPallini21-Aug-23 20:41

21-Aug-23 20:41

There is no 'safe way' to do those 'conversions'.
On x64 the int data type is a 32-bit integer, while both INT_PTR and LRESULT are 64-bit integers (long long, see Windows Data Types (BaseTsd.h) - Win32 apps | Microsoft Learn[^]), hence such conversions would 'narrow'.
Also, I believe there is no 'safe way' to convert a LRESULT to a BOOL, because the former value depends on context (see, for instance, Writing the Window Procedure - Win32 apps | Microsoft Learn[^]).

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

Randor 22-Aug-23 1:13

Randor

22-Aug-23 1:13

Hi,

If you want to detect overflows, underflows, truncation. The Shell team provided the intsafe.h header.

wizQ wrote:
1.INT_PTR to int?

The IntPtrToInt function will at least warn you if the pointer was truncated.

CPallini gave great advice, there really isn't a "safe" conversion. But you can at least detect overflows and underflows.

utcode22-Aug-23 17:46

utcode

22-Aug-23 17:46

can one change int to LRESULT?.

change from
int c = ...
to
LRESULT c = ...

also change from
void func(int p,..
to
void func(LRESULT p,...
Java | [Coffee]

Richard MacCutchan22-Aug-23 21:42

Richard MacCutchan

22-Aug-23 21:42

The question is, why would you want to do such a thing? The LRESULT type has a specific meaning and purpose, which is not the same as an int, or any other basic, type.

generate PDF file

utcode18-Aug-23 18:13

utcode

18-Aug-23 18:13

Hi,
Got two items to ask. First, is there a library available for c++ mfc that can write results to PDF?. libHARU is deoendent on zlib , libpng, etc. Like to try something more straight forward and free. secondly, is there a possibility to save a CDialog to PDF file?. Poke tongue | ;-P

Re: generate PDF file

Victor Nijegorodov18-Aug-23 21:03

Get LVN_MARQUEEBEGIN in CListCtrl

18-Aug-23 21:03

You could just print what you want using Microsoft Print to PDF printer.

Re: generate PDF file

jschell21-Aug-23 2:37

jschell

21-Aug-23 2:37

When I googled certainly seem to suggest that.

"C++" pdf libary

Not free (I don't think) but years ago Crystal Reports had an API and among many outputs possible was PDF.

Li Lin 202317-Aug-23 22:04

17-Aug-23 22:04

I have a class inherited from CListCtrl. Why I didn't get LVN_MARQUEEBEGIN notification in the method OnNotify() of my class when clicking and dragging??? Frown | :(

C++

BOOL CListCtrlEx::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT*
pResult)
{
    LPNMLISTVIEW pnmv = (LPNMLISTVIEW)lParam;

    switch(pnmv->hdr.code){
      case LVN_MARQUEEBEGIN:
        ; // Deal with some case here.
      break;
    }

    return CListCtrl::OnNotify(wParam, lParam, pResult);
}

modified 22-Aug-23 2:43am.

Victor Nijegorodov17-Aug-23 23:16

17-Aug-23 23:16

Could these discussion help you?
https://stackoverflow.com/questions/56977766/how-to-implement-multiple-selection-in-listview-with-lvn-marqueebegin
https://stackoverflow.com/questions/56619044/clistctrl-select-multiple-lines-with-the-mouse

Li Lin 202320-Aug-23 14:38

20-Aug-23 14:38

I have noted those discussion before, no clue..

Victor Nijegorodov21-Aug-23 8:11

21-Aug-23 8:11

Then perhaps you'll describe how you are doing the "dragging" anw how and in what class you are handling this notification... Suspicious | :suss:

Li Lin 202321-Aug-23 15:29

21-Aug-23 15:29

Click the left button, hold on it and move the mouse to somewhere else, no any message receive... My codes as below:

<pre lang="C++">

BOOL CListCtrlEx::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT*
pResult)
{
LPNMLISTVIEW pnmv = (LPNMLISTVIEW)lParam;

switch(pnmv->hdr.code){
case LVN_MARQUEEBEGIN:
; // Deal with some case here.
break;
}

return CListCtrl::OnNotify(wParam, lParam, pResult);
}

This method is trigged only when move mouse into the dialog which contains CListCtrlEx object, message type is TTN_GETDISPINFOW.

Victor Nijegorodov21-Aug-23 21:47

21-Aug-23 21:47

I added the message handler for LVN_MARQUEEBEGIN in my CListCtrl derived class:

C++

BEGIN_MESSAGE_MAP(CListOptionsCtrl, CListCtrl)
   ON_NOTIFY_REFLECT(LVN_MARQUEEBEGIN, &CListOptionsCtrl::OnLvnMarqueeBegin)
...
void CListOptionsCtrl::OnLvnMarqueeBegin(NMHDR* pNMHDR, LRESULT* pResult)
{
   LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
   // TODO: Add your control notification handler code here
   *pResult = 0;
}

and it does work. Suspicious | :suss:

Richard MacCutchan20-Aug-23 21:51

Richard MacCutchan

20-Aug-23 21:51

Without seeing some of your code it is impossible to guess.

Li Lin 202321-Aug-23 20:45

21-Aug-23 20:45

Updated my question, added related codes.

Richard MacCutchan21-Aug-23 21:28

Richard MacCutchan

21-Aug-23 21:28

Where is the MFC ON_NOTIFY table that defines the captures? Note also that the notification goes first to the list control's parent window, so you need to capture it there.

Randor 22-Aug-23 1:23

Randor

22-Aug-23 1:23

Li Lin 2023 wrote:
BOOL CListCtrlEx::OnNotify

You cannot capture it there. You will need to use ON_NOTIFY_REFLECT if you want to capture LVN_MARQUEEBEGIN in your CListCtrl derived class.

Or as Richard pointed out you can capture that message in the parent window.

Li Lin 202322-Aug-23 14:30