ATL / WTL / STL

Richard MacCutchan24-Feb-16 21:33

24-Feb-16 21:33

1. Yes, MFC/ATL applications can make calls to C++ functions or class methods, and pure C functions.
2. Yes, but you would need a single project for the final DLL.
3. See Decorated Names[^].

bkelly1325-Feb-16 13:07

25-Feb-16 13:07

1. I expected that and thank you for the confirmation
2. I suppose that is not a big problem, may make for a large project, but that will have to do.
3. I was hoping for something easier, but this also is what it is.
Thank you for taking the time to reply.

Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com

Richard MacCutchan25-Feb-16 22:18

25-Feb-16 22:18

On point 3 I am sure I once found a tool or some source code (years ago now) that decoded them for you. Try some Google foo.

Jochen Arndt25-Feb-16 22:37

Jochen Arndt

25-Feb-16 22:37

The Dependency Walker (depends.exe) Home Page[^] can show parameters for functions with C++ decoration.

Richard MacCutchan26-Feb-16 0:01

Question about Direct3D View Area

26-Feb-16 0:01

Member 112032772-Feb-16 5:24

Member 11203277

2-Feb-16 5:24

I am following the example about setting up Direct3D rendering area on this link:
Tutorial 1: Direct3D 11 Basics[^]

All I did is just wrapped it in my own class and instantiated within MFC project.

However, my question is, why no matter what values I put as width/height in the DXGI_SWAP_CHAIN_DESC structure, I still get all window filled with blue?

shouldnt width/height in that structure or in the D3D11_VIEWPORT structure make difference at all?

FormatMessage for unicode

bkelly1330-Jan-16 15:03

Re: FormatMessage for unicode

30-Jan-16 15:03

Windows 10, Visual Studio 2012,C++

I need a version of FormatMessage() for Unicode, WCHAR. Google and MSDN deny all my searches for same. I want to call a function of my own that accepts a pointer to WCHAR and the error number, and puts the resultant string in the passed array.

Lacking that, I need a version of swprintf() that has an argument for a max number of characters to move into the string and accepts the LPSTR that is returned by FormatMessage().

Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com

Richard MacCutchan30-Jan-16 21:15

WCHAR argument pointer Resolved

30-Jan-16 21:15

I presume you mean something like:

C++

void ShowError(DWORD    dwError,
               PWSTR    pszMessage,
               int      maxMessageSize
               )
{
    if (dwError == 0)
    {
        dwError = GetLastError();
    }
    if (FormatMessage(
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS |
        FORMAT_MESSAGE_MAX_WIDTH_MASK,                // don't include line breaks
        NULL,                                         // no source message
        dwError,                                      // message identifier
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),    // default language
        pszMessage,                                   // address of message buffer
        maxMessageSize,                               // size of user supplied buffer
        NULL                                          // optional parameter list
        ) == 0)
    {
        // unknown error code
        swprintf_s(pszMessage, maxMessageSize, L"Error code: %d (0x%X)", dwError, dwError);
    }
}

Which you call by:

C++

WCHAR        szMessage[512];
ShowError(nErrorCode, szMessage, _countof(szMessage));
wcout << "Exception: " << szMessage << endl;

modified 31-Jan-16 8:59am.

Message Removed

20-Jan-16 21:38

crzoaknn

20-Jan-16 21:38

Message Removed

modified 21-Jan-16 4:17am.

Message Removed

20-Jan-16 21:51

Gerry Schmitz

20-Jan-16 21:51

Message Removed

modified 21-Jan-16 3:54am.

bkelly1314-Jan-16 16:07

Re: WCHAR argument pointer

14-Jan-16 16:07

The dot H file contains:

C++

const WCHAR DEFAULT_DlRECTORY[ ] = L"C:\\LOG_FILES\\";
const WCHAR  DEFAULT_FILENAME_PREFIX[]      = L"Log_File_";

The dot CPP file contains

C_Log_Writer::C_Log_Writer( 
const WCHAR *new_directory_name = &DEFAULT_DlRECTORY, 
const WCHAR *new_name_prefix    = &DEFAULT_FILENAME_PREFIX[0] )
{ ... }

The new_directory_name lines does not compile and produces the error:

C++

Error	1	error C2440: 'default argument' : cannot convert from 'const WCHAR (*)[14]' to 'const WCHAR *'	e:\code_tests\common_code_dll\c_log_writer\c_log_writer.cpp	73	1	C_Log_Writer

I thought new_directory_name would be a pointer that would by default point to the first character of the array. Why is that thinking wrong?

Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com

modified 15-Jan-16 17:58pm.

Richard Andrew x6414-Jan-16 16:38

Richard Andrew x64

14-Jan-16 16:38

Because you're trying to assign a pointer-to-a-pointer to a pointer:

const WCHAR *new_directory_name = &DEFAULT_DlRECTORY

should be

const WCHAR *new_directory_name = DEFAULT_DlRECTORY

The difficult we do right away...
...the impossible takes slightly longer.

Re: WCHAR argument pointer

bkelly1315-Jan-16 11:58

Scrolling ATL Dialog with mouse wheel problem.

15-Jan-16 11:58

And that is because DEFAULT_DlRECTORY is an array and passing it as an argument means the address of the first character is passed. Ok, I must confess to being ate up with the dumb ass there.
Thank you for taking the time for a gentle kick in the butt.

Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com

Member 1213702619-Dec-15 18:11

Member 12137026

19-Dec-15 18:11

I had created an ATL Dialog based application in visual studio 2012,On Scrolling the mouse wheel I want my dialog to be scrolled.

What should i write inside:

C++

LRESULT CUIWindowPage::OnMouseWheel(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
     ??
}

Re: Scrolling ATL Dialog with mouse wheel problem.

Richard MacCutchan19-Dec-15 21:07

CoCreateInstance(CLSID_SpVoice); fails with Class not registered

19-Dec-15 21:07

See https://msdn.microsoft.com/en-us/library/eff58fe7.aspx[^].

ptr_Electron14-Dec-15 0:56

ptr_Electron

14-Dec-15 0:56

I am using Microsoft speech sdk v 11 (https://msdn.microsoft.com/en-us/library/jj127898.aspx[^]). the below call fails, when I check GetLastError, observed that it fails to message "Class not registered". visual studio 2008, windows 7

C++

hr = cpVoice.CoCreateInstance(CLSID_SpVoice);

Please advise

modified 14-Dec-15 7:05am.

Re: CoCreateInstance(CLSID_SpVoice); fails with Class not registered

Jochen Arndt14-Dec-15 1:39

Jochen Arndt

14-Dec-15 1:39

When using Windows 7 64-bit, check if you have installed the version of the Microsoft Speech Platform - Runtime that matches your project settings (32 or 64 bit), or just change your project to match the installed version.

Re: CoCreateInstance(CLSID_SpVoice); fails with Class not registered

ptr_Electron14-Dec-15 1:52

ptr_Electron

14-Dec-15 1:52

Thanks for response. project is 32 bit and I installed x86. I think that should be ok. what could be other reasons please advise. thanks in advance.

Re: CoCreateInstance(CLSID_SpVoice); fails with Class not registered

Jochen Arndt14-Dec-15 2:13

Jochen Arndt

14-Dec-15 2:13

Did you have called CoInitialize[Ex] before?

To check if it is registered you can look into the registry at HKCR\CLSID\value_of_CLSID_SpVoice. If it is not present, it may help to re-install the runtime.

find crash location in the code

bkelly1313-Dec-15 15:58

Re: find crash location in the code

13-Dec-15 15:58

Windows 7, Visual Studio 2010, C++

An application I wrote that has been running for over a year has just started getting an unhandled exception. It is _com_error and the exact return value if E_FAIL, an unspecified error. That is unhelpful. The crash window specifies an address where the crash occurred.

Question:
How does one take that address and find the place in the code where the program was executing when the exception was first thrown?

Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com

Richard Andrew x6413-Dec-15 16:14

Richard Andrew x64

13-Dec-15 16:14

This is an old article, but I believe it still applies:

Post-Mortem Debugging Your Application with Minidumps and Visual Studio .NET[^]

The difficult we do right away...
...the impossible takes slightly longer.

Re: find crash location in the code

Richard Andrew x6414-Dec-15 9:37

Richard Andrew x64

14-Dec-15 9:37

Here's another much more recent article about what you can do to find the error:

Investigate crashes: c stack trace and dumps[^]

The difficult we do right away...
...the impossible takes slightly longer.

how to determine max TCP/IP send size

bkelly1313-Dec-15 15:51

Re: how to determine max TCP/IP send size

13-Dec-15 15:51

Windows 7, Visual Studio 2010, C++

How can an application determine the maximum size for a single chunk of data to be sent from a server application to a client application on another computer?

This is on a private network, not not accessible outside of the control room. There is a switch between the two computers but that is about it.

I presume this can be done a run time. My application sends large amounts of telemetry data to a client for display. The goal is to reduce buffering as much as possible. The app uses overlapped I/O with completion events.

Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com

Richard MacCutchan13-Dec-15 21:11

Re: how to determine max TCP/IP send size

13-Dec-15 21:11

See https://www.google.com/search?q=tcp%2Fip%20buffer%20size[^].

bkelly1318-Dec-15 15:39