C / C++ / MFC

25-Jan-22 17:16

For the class parameter the documentation says a redefined name (not sure what that means) the reason I am asking I am using a control for which I have a specific WNDCLASS which I registered however the CDialog::Create fails with that control statement in the resource definition

Thanks

Richard MacCutchan25-Jan-22 21:57

25-Jan-22 21:57

We need to see the code and a bit more detail. If the control is not known at build time then the resource compiler may well have a problem.

Stefan_Lang25-Jan-22 23:25

Stefan_Lang

25-Jan-22 23:25

As Richard said, we need more information:
- what is "the class parameter"?
- what is "the documentation" you are referring to?
- what is "the CDialog::Create"?
- also: in what way does it "fail"? Is there a compiler, linker or run-time error, and what does it say? Or does you program not behave in the expected way - if so, how, and what did you expect?

You are apparently referring to very specific things, but we have no idea what you're seeing or reading. (or whether that is relevant information to start with)

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

ForNow26-Jan-22 1:41

26-Jan-22 1:41

Here are the resource statements Here is the call The resource in question is IDC_CUSTOM5 Fail means that when I comment out that CONTROL staement tracing my code the create goes to my

C++

OnInitDialog

my question is in the class parm of the resource control can it be my own class which I register at run time via RegesterClass
thank you

C++

BOOL ret2 = drivestorage->Create(IDD_DIALOG10, m_pMainWnd);

IDD_DIALOG10 DIALOGEX 0, 0, 769, 429
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Storage View / Change"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
    CTEXT           "",IDC_TCB,45,30,47,8
    CTEXT           "OwnIng TCB",IDC_STATIC,41,13,58,8
    CTEXT           "",IDC_SP,164,28,43,8
    CTEXT           "Storage SubPool",IDC_STATIC,162,12,55,8
    CTEXT           "",IDC_ASID,265,26,32,8
    CTEXT           "Asid",IDC_STATIC,269,9,31,8
    CTEXT           "",IDC_FP,399,31,19,8
    CTEXT           "Fetch Protect Key",IDC_STATIC,392,15,63,8
    CONTROL         "",IDC_CUSTOM5,"PieCOntrol",WS_TABSTOP,617,99,109,109
    COMBOBOX        IDC_COMBO1,491,236,48,30,CBS_DROPDOWN | CBS_SORT | WS_VSCROLL | WS_TABSTOP
    CONTROL         "",IDC_EDIT2,"RichEdit20A",ES_MULTILINE | WS_BORDER | WS_TABSTOP, 45,106,494,314
    EDITTEXT        IDC_EDIT1,45,110,494,314,ES_AUTOHSCROLL
    COMBOBOX        IDC_COMBO2,637,244,67,16,CBS_DROPDOWN | CBS_SORT | WS_VSCROLL | WS_TABSTOP
    LISTBOX         IDC_LIST2,641,310,68,11,LBS_SORT | LBS_NOINTEGRALHEIGHT | WS_VSCROLL | WS_TABSTOP
END

Richard MacCutchan26-Jan-22 3:37

26-Jan-22 3:37

ForNow wrote:
can it be my own class which I register at run time via RegesterClass

I am not sure as I have never tried that. The documentation at CONTROL control - Win32 apps | Microsoft Docs[^] states (although it is slightly ambiguous) that it must be one of the predefined classes. If your code is failing when you try it with a locally defined class then you need to use the debugger to find out why.

ForNow26-Jan-22 3:52

26-Jan-22 3:52

I think the documentation means you have to Register the Class before calling CDialog::Create as I remember I forgot to call AfxInitRichEdit before doing a CDialog::Create and it failed I think CDialog::Create Checks Uid template dialog resource and sees if the classes are registered

Thanks you

Richard MacCutchan26-Jan-22 4:36

26-Jan-22 4:36

I assumed you were doing that anyway, since Windows cannot create an object of a class that it does not know about.

Mircea Neacsu26-Jan-22 10:08

Mircea Neacsu

26-Jan-22 10:08

I've never tried it so I'm not sure exactly how it works but I notice a rather strange capitalization in you class name: "PieCOntrol". I don't know if Windows is case sensitive or not when looking for class name.

Mircea

ForNow26-Jan-22 10:13

26-Jan-22 10:13

Thanks that’s they way I had it in my wndclass I am displaying a pie chart on the side of a dialog box but need a Cwnd class to hang it off of thats the class I’m using for it used the cpiedemo from this site for learning

Victor Nijegorodov26-Jan-22 22:56

Victor Nijegorodov

26-Jan-22 22:56

According to this discussion:
winapi - Are Windows window classes case-sensitive? - Stack Overflow
and the link to About Atom Tables - Win32 apps | Microsoft Docs the window class name is case insensitive.

Victor Nijegorodov26-Jan-22 2:20

Victor Nijegorodov

26-Jan-22 2:20

You may want to look at this Joe Newcomer's essay: Self-Registering Window Classes

ForNow26-Jan-22 2:24

How to sign pdf and verify the signature using a C++ open source library

26-Jan-22 2:24

Thank you

Member 1114733825-Jan-22 16:45

Member 11147338

25-Jan-22 16:45

Hi,now I need to sign pdf and verify the signatue of a signed pdf,could someone tell me is there any C++ library can do this.

Re: How to sign pdf and verify the signature using a C++ open source library

Richard MacCutchan25-Jan-22 21:53

sign pdf C++ - Google Search[^]

25-Jan-22 21:53

Stack Overflow exeception

ForNow25-Jan-22 1:41

25-Jan-22 1:41

Im getting a stack over flow execption its not from an ASSERT but storage on my stack frame is corrupted. I have a thread Waitting on event to be notified when a socket read is pending

I trace socket number upon entry and its ok I initialize a WSABUF which 15 entires and its fine somewhere when I do the WaitforSingleObject the stack frame gets corrupted

I did a data break point on the socket and its was somewhere in UserCallwinprocccheckwow.

best to post my code some where in the WaiforSingleObject sonething happens to my stack frame

here is the code for notification
int ret1 = WSAEventSelect(mysocket, socksevent, FD_READ | FD_CLOSE);

here is the createthread

struct threadparm thethreads;
thethreads.thesocket = mysocket;
thethreads.sendwidow = pFrame->m_hWnd;
thethreads.messge = WM_STORAGE;
thethreads.sockevent = socksevent;
struct threadparm* parmptr = &thethreads;

HANDLE threadhandle = ::CreateThread(NULL, 0, SocketThread, (LPVOID)parmptr, 0, &threadid);

the thread with Waitforsingleobect were somewhere threadptr->thesocket gets corrupted

DWORD WINAPI SocketThread(LPVOID lphadleparater)
{
WSANETWORKEVENTS socknetwork;
struct threadparm* threadptr;
threadptr = (threadparm *)lphadleparater;
WSABUF DataBuf[15];
DWORD recived;
int i, j;
DWORD flags = 0;
WSAOVERLAPPED myoverlap;
char* sendcopy = new char[3825];
char* holdptr = sendcopy;
j = 0;
for (i = 0; i < 15; i++)
{
DataBuf[i].buf = new char[255];
DataBuf[i].len = 255;
}
struct _WSABUF* tcpip = &DataBuf[0];

DWORD dwWaitStatus = WaitForSingleObject(threadptr->sockevent, INFINITE);

switch (dwWaitStatus)
		/* a read is pending */
	    	case WAIT_OBJECT_0 + 0:
	{
		int return_code = WSAEnumNetworkEvents(threadptr->thesocket, threadptr->sockevent, &socknetwork);

Greg Utas25-Jan-22 1:58

Greg Utas

25-Jan-22 1:58

It would be easier to look at your code if it was formatted. However, it isn't obvious to me what's causing your stack overflow. Do you have more code that you're not showing?

A stack overflow is caused by too much function call nesting (perhaps because of recursion), too many local variables (usually large arrays), or creating a thread with a smaller stack than it needs (that's the second parameter to CreateThread, and since you're using 0, you're getting Windows' default size, which should be OK).

Robust Services Core | Software Techniques for Lemmings | Articles
The fox knows many things, but the hedgehog knows one big thing.

ForNow25-Jan-22 2:14

25-Jan-22 2:14

is there a way to determine how much storage my local variables are currently taking maybe an output on the build

thanks

Greg Utas25-Jan-22 2:32

Greg Utas

25-Jan-22 2:32

If there's a compiler option to generate a listing file, that might contain the information. I've never done this in Windows C++, so you'd have to look into it.

Another way would be to do this at the top of your function:

C++

int first;
// rest of local variables
int last;

int size = &last - &first;  // distance from first to last local variable
if(size < 0) size = -size;  // depends on how compiler lays out memory
size -= sizeof(int);        // the real size after removing FIRST and LAST

cout << "This function's locals use " << size << " bytes." << std::endl;

Robust Services Core | Software Techniques for Lemmings | Articles
The fox knows many things, but the hedgehog knows one big thing.

ForNow25-Jan-22 2:46

25-Jan-22 2:46

Thanks

Graham Breach25-Jan-22 7:47

Graham Breach

25-Jan-22 7:47

This might not work - the compiler doesn't have to maintain the order of variables on the stack, so last could end up before or after first and the other variables.

Mircea Neacsu25-Jan-22 2:11

Mircea Neacsu

25-Jan-22 2:11

Seems to me the thethreads was allocated on the stack and disappeared by the time thread is executing.

As Greg was saying, formatting would be nice.

Mircea

ForNow25-Jan-22 2:20