C / C++ / MFC Discussion Boards

Stephen Hewitt19-Jul-06 15:22

19-Jul-06 15:22

What do you mean a "WriteProcessMemory Hook"? I know about SetWindowsHookEx but you don't explain how WriteProcessMemory fits into the picture. If you use DLL injection using SetWindowsHookEx the hook DLL is in-process and so can access the prosess's memory directly without the need for WriteProcessMemory.

Steve

Preventing the C++ compiler to optimize [solved] [modified]

Jörgen Sigvardsson19-Jul-06 13:14

Jörgen Sigvardsson

19-Jul-06 13:14

Solution:
Silly me. Originally I had intended to do this stuff in header files, which meant I had to use __declspec(selectany) with these declarations. But at one point, I moved them into the .cpp files, but forgot to remove the __declspec. That directive tells the compiler to keep one reference to the code for the entire link module. If no other code references it, the code is discarded. All I had to do was to remove the directive, and voila! Blush | :O

I have a rather awkward problem with the optimizer in the VS2k3 C++ compiler.
I'm using global objects to initialize a linked list, which I later pick up in the program.

It works sort of like this:

struct Entry {
   Data data;
   Entry* next; 
};
 
extern Entry* g_head = 0;

... 

struct OneOfMyGlobalObjects {
   OneOfMyGlobalObjects() {
      static Entry entry;
      entry.data = ...;
      entry.next = g_head;
      g_head = &entry;
   }
} g_OneOfMyGlobalObjects;

As the g_OneOfMyGlobalObjects variable is never used anywhere in the application, the compiler optimizes it away. Obviously, I don't want that. I figured I could circumvent this by slapping an extern onto the variable, but that didn't help. I went as far as putting a __declspec(dllexport) on it - that did the trick. Although, I don't want to export these objects. It's not the end of the world if I do, but I like tidiness. Smile | :)

Also, I do not fancy the idea of turning off some global optimizer switch, as I like optimization (but just not in these specific instances).

So, is there any magical #pragma or __declspec available?

--
Based on a True Story

Last modified: den 19 juli 2006 18:21:40 --

Failed to invoke web services in VC++, please help [modified]

Liu Shuai19-Jul-06 11:38

Liu Shuai

19-Jul-06 11:38

Hi all,

I'm trying to invoke web services written in c# from a VC++ 7.1 app.
The function I'm invoking is quite simple.
<code>
[WebMethod]
public int Foo(int i)
{
return i + 1;
}
</code>

It works fine when I test the client in C#. I then tested in VC++. I added the web reference and SPROXY generate the header files for me. Here's is my client code in c++

<code>
...
if (SUCCEEDED(CoInitialize(NULL))))
{
TestServices::CTestServices ws;
int ret = 0;
HRESULT hr = ws.Foo(3, &ret);
CoUninitialize();
}
</code>

However ws.Foo() returns E_FAIL. I stepped in the generated code and it failed at BeginParse() function in atlsoap.h
<code>
virtual HRESULT BeginParse(IStream *pStream)
{
ATLASSERT( pStream != NULL );
CComVariant varStream;
varStream = static_cast<IUnknown*>(pStream);

HRESULT hr = m_spReader->parse(varStream); //it fails here
if (SUCCEEDED(hr))
{
if (m_refMap.GetCount() != 0)
{
hr = E_FAIL;
}
}
return hr;
}
</code>

And I see following error message in the output window
ATLSOAP: CSoapRootHandler::GetElementEntry -- element not found: Action.
ATLSOAP: CSoapRootHandler::GetElementEntry -- element not found: MessageID.
ATLSOAP: CSoapRootHandler::GetElementEntry -- element not found: To.
ATLSOAP: CSoapRootHandler::GetElementEntry -- element not found: Security.
ATLSOAP: CSoapRootHandler::endElement -- invalid SOAP message format while processing headers.

Also, here is the xml result returned by the web service call

<?xml version="1.0" encoding="utf-8"?>
<int xmlns="http://www.blahblah.com/webservices/">4</int>

What am I missing? Thank you all in advance.

-- modified at 17:41 Wednesday 19th July, 2006

Re: Failed to invoke web services in VC++, please help

kapil_moondra5-Jan-09 1:25

kapil_moondra

5-Jan-09 1:25

I'm getting the same error. Please let me know if you got the answer for this problem.

Thanks,
Kapil

I hate imagelists!! ( drawing with ILD_TRANSPARENT ) [modified]

Maximilien19-Jul-06 11:23

Maximilien

19-Jul-06 11:23

I kind of hate imagelists.

I'm trying to draw transparent images (without masks) from a CImageList with the ~~ILD_TRANSPARENT~~ ILD_NORMAL parameter and obviously it does not work as intended, because the error is between the chair and the keyboard.

This is how I do it :

My bitmap ( IDR_MAINFRAME ) is a 256 colours bitmap with RGB( 192, 192, 192 ) as the background
colour; the dialog BG colour is RGB( 218, 222, 232 )

void CAboutDlg::OnPaint()
{
 CPaintDC dc(this); // device context for painting
 COLORREF cDialogBG = RGB( 218, 222, 232 );

 CRect rect;
 GetClientRect( rect );
	
 CBrush brush;
 brush.CreateSolidBrush( cDialogBG );
 dc.FillRect( rect, &brush );
 CBitmap bmp;
 bmp.LoadBitmap(IDR_MAINFRAME );

 CImageList imageList;
 imageList.Create(16,15, ILC_COLOR8, 4, 1);
 imageList.SetBkColor(  CLR_NONE );//cDialogBG  );
 imageList.Add(&bmp, RGB( 192, 192, 192 ));

 imageList.Draw( &dc, 0, CPoint( 10, 10 ), ILD_NORMAL );
}

I'm becoming clueless and a bit aggravated because it seems i'm doing all the basics rights, and this should work as advertised.
Frown | :(

Thanks.

( modified because I screwed up my post )
Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

-- modified at 20:39 Wednesday 19th July, 2006

Re: I hate imagelists!! ( drawing with ILD_TRANSPARENT )

led mike19-Jul-06 11:40

led mike

19-Jul-06 11:40

You don't say what the problem is. I guess the image is drawing OK but not tranparent?

You say you are using ILD_TRANSPARENT but that is not in the code you posted
You say the image background color (transparent color) is 256,256,256 but that is not in the code you posted

Confused | :confused:

Re: I hate imagelists!! ( drawing with ILD_TRANSPARENT )

Maximilien19-Jul-06 14:41

Maximilien

19-Jul-06 14:41

yeah, that's how I feel, I can't even post a question properly today.

Thanks.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: I hate imagelists!! ( drawing with ILD_TRANSPARENT )

Michael Dunn19-Jul-06 16:15

Michael Dunn

19-Jul-06 16:15

You need to use the ILC_MASK flag when creating the image list for it to have a mask (which is how it does transparency). Then when you add the images, use icons (which have built-in trasparency) or a bitmap with one color that indicates the transparent parts.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Is the microphone in use?

Larsson19-Jul-06 10:35

Larsson

19-Jul-06 10:35

Is it possible to check if the microphone is in use?

Re: Is the microphone in use? [modified]

Ali Rafiee19-Jul-06 10:52

Ali Rafiee

19-Jul-06 10:52

This sound familiar!

First, how are you opening the microphone device?

Assuming that you are using waveInOpen(...) it will return MMSYSERR_ALLOCATED if someone else already has a handle to the microphone.

If waveInOpen is not the way you are using the Mic then let us know in what context you are using it so that we can give an intelegent answer.

AliR.
Visual C++ MVP

-- modified at 16:59 Wednesday 19th July, 2006

How can I select a node in a treeview

Alex Cutovoi19-Jul-06 9:08

Alex Cutovoi

19-Jul-06 9:08

Hi fellows.

I have a treeview(populated) and I would like to select a single node I have this code:

<br />
case WM_NOTIFY:<br />
      {<br />
         TV_ITEM tempTvItem;<br />
         char cTemp[256]="";<br />
         unsigned int uiVal = 0;<br />
         LPNMHDR notifyMessageStruct = (LPNMHDR)lParam;<br />
         if(notifyMessageStruct->hwndFrom == treeViewHwnd)<br />
         {<br />
            if(notifyMessageStruct->code == NM_CLICK)<br />
            {<br />
                  nodeSelected = (HTREEITEM)SendDlgItemMessage(treeViewHwnd, IDC_TREE1, TVM_SELECTITEM, TVGN_CARET, (LPARAM)nodeSelected);<br />
                  //itoa((int)nodeSelected, cText, 10);<br />
                  tempTvItem.mask = TVIF_TEXT|TVIF_HANDLE;<br />
                  tempTvItem.hItem = nodeSelected;<br />
                  tempTvItem.pszText = cTemp;<br />
                  tempTvItem.cchTextMax = 256;<br />
                  SendMessage(treeViewHwnd, TVM_GETITEM, 0, (LPARAM)&tempTvItem);<br />
                  MessageBox(NULL, tempTvItem.pszText, "", MB_OK);<br />
...<br />

My problem is that the select part. The node isn`t selected and in the MessageBox nothing is shown.
What`s the problem? I want when I select the node it remais highlighted and selected.

Re: How can I select a node in a treeview

Ali Rafiee19-Jul-06 9:21

Ali Rafiee

19-Jul-06 9:21

Where did you get IDC_TREE1 from??

If you are using a CTreeView view, why aren't you using GetTreeCtrl()->SelectItem(...);?

AliR.
Visual C++ MVP

Re: How can I select a node in a treeview [modified]

Alex Cutovoi19-Jul-06 11:18

Alex Cutovoi

19-Jul-06 11:18

I`m not using CTreeView, I`m creating the treeview with CreateWindowEx function. and in the HMENU part
I include the IDC_TREE1 like the ID of the window.....
Like this:

<br />
treeViewHwnd = CreateWindowEx(WS_EX_CLIENTEDGE, WC_TREEVIEW, "theTreeView", WS_CHILD|WS_VISIBLE|TVS_SHOWSELALWAYS|TVS_TRACKSELECT|TVS_EDITLABELS|TVS_HASBUTTONS|TVS_HASLINES|TVS_LINESATROOT, 0, 0, 400, myRect.bottom, hwnd, (HMENU)IDC_TREE1, hCurrentInstance, NULL);<br />

-- modified at 17:19 Wednesday 19th July, 2006

Re: How can I select a node in a treeview

Ali Rafiee19-Jul-06 11:23

Ali Rafiee

19-Jul-06 11:23

In that case try this

nodeSelected = (HTREEITEM)SendMessage(treeViewHwnd, TVM_SELECTITEM, TVGN_CARET, (LPARAM)nodeSelected);

AliR.
Visual C++ MVP

Re: How can I select a node in a treeview

Alex Cutovoi20-Jul-06 2:24

Alex Cutovoi

20-Jul-06 2:24

Ali unhappilly, this code doesn`t work too....
I`m almost changing to TreeView_SelectItem....

Serial Communication with a Garmin Device

dinesh_pam19-Jul-06 8:40

dinesh_pam

19-Jul-06 8:40

Hi, am new to MS VC++, and I need to interface a PC to a handeheld GPS device (Garmin etrex). Am using a serial to USB cable, and I can connect using hyperterminal so HW is ok. However, when I try to use some example code supplied on the Garmin website, I cant connect! The relevant code fragment is (I believe):

HDEVINFO theDevInfo = SetupDiGetClassDevs((GUID*) &GUID_DEVINTERFACE_GRMNUSB, NULL, NULL, DIGCF_ALLCLASSES );

SP_DEVICE_INTERFACE_DATA theInterfaceData;
theInterfaceData.cbSize = sizeof( theInterfaceData );

if( !SetupDiEnumDeviceInterfaces( theDevInfo, NULL, (GUID* &GUID_DEVINTERFACE_GRMNUSB, &theInterfaceData ) && GetLastError() == ERROR_NO_MORE_ITEMS )
{
gHandle = 0;
return;
}
--------------

Garmin tech support wont help and any help would be GREATLY appreciated Confused | :confused:

Thanks! Dinesh

Re: Serial Communication with a Garmin Device

cppcook19-Jul-06 9:02

cppcook

19-Jul-06 9:02

hey man,
why do you want to do this? Garmin products have features other than navigation?
btw, I have a garmin streetpilot i5 and it works very well. Smile | :)

Re: Serial Communication with a Garmin Device

kitty519-Jul-06 9:11

kitty5

19-Jul-06 9:11

dinesh_pam wrote:
if( !SetupDiEnumDeviceInterfaces( theDevInfo, NULL, (GUID* &GUID_DEVINTERFACE_GRMNUSB, &theInterfaceData ) && GetLastError() == ERROR_NO_MORE_ITEMS )
{
gHandle = 0;
return;
}

In the above try this so see what the error exactly is:

<br />
// Find the requested interface<br />
if( !SetupDiEnumDeviceInterfaces( theDevInfo, NULL, (GUID* &GUID_DEVINTERFACE_GRMNUSB, &theInterfaceData ) )<br />
{<br />
if(GetLastError()== ERROR_NO_MORE_ITEMS)               <br />
{<br />
printf("**Error: couldn't find device(no more items), (0)\n");<br />
SetupDiDestroyDeviceInfoList(theDevInfo);<br />
gHandle = 0;<br />
return -1;<br />
}<br />
else<br />
{<br />
printf("**Error: couldn't enum device, (%d)\n"), GetLastError());<br />
SetupDiDestroyDeviceInfoList(theDevInfo);<br />
gHandle = 0;<br />
return -1;<br />
}<br />
}<br />

Kitty5

Re: Serial Communication with a Garmin Device

dinesh_pam19-Jul-06 9:29

dinesh_pam

19-Jul-06 9:29

thank you kindly for the reply. The error is couldnt find device. i.e. "**Error: couldn't find device(no more items), (0)"

Is there anyway I could just read the virtual COM port like hyperterminal is doing instead of this?

Dinesh

Re: Serial Communication with a Garmin Device

kitty519-Jul-06 9:45

kitty5

19-Jul-06 9:45

Not quite sure how to:

dinesh_pam wrote:
Is there anyway I could just read the virtual COM port like hyperterminal is doing instead of this?

However:
Did you include the file that contains the device's GUID?
It's usually a .h file that looks like:

<br />
#ifdef DEFINE_GUID<br />
<br />
// The GUID that is used to identify this device's interface<br />
// {AF1B231E-1180-420b-8CB6-2ED2A53F9F92}<br />
DEFINE_GUID(GUID_DEVINTERFACE_ALTGENERIC, 0xaf1b231e, 0x1180, 0x420b, 0x8c, 0xb6, 0x2e, 0xd2, 0xa5, 0x3f, 0x9f, 0x92);<br />
<br />
#endif<br />

If you don't have a GUID for your device the PC will not be able to create a handle to the device. The handle is what give you the ability to communicate to the device.

Also, make sure that you: #include "INITGUID.H" in that GUID .h file.

Kitty5

Re: Serial Communication with a Garmin Device

dinesh_pam19-Jul-06 10:06

dinesh_pam

19-Jul-06 10:06

Thanks, but all that's done further up in the file.

I'm really frustrated with this. I find it hard to believe such a simple task can be so complicated.. Anybody else help me out please? Unsure | :~

Dinesh

Re: Serial Communication with a Garmin Device

led mike19-Jul-06 10:33

led mike

19-Jul-06 10:33

Well your call to SetupDiEnumDeviceInterfaces does not have matching parenthesis so something very wrong is there.

You are not checking the HDEVINFO return value so you may not even have a valid handle to pass to SetupDiEnumDeviceInterfaces

HDEVINFO hDevInfoSet = SetupDiGetClassDevs(&guid, NULL, NULL, DIGCF_ALLCLASSES );
if( INVALID_HANDLE_VALUE == hDevInfoSet)
{
	DWORD dwErr = ::GetLastError();
	// display error information or whatever
}
else
{ ...}

You are not initializing the SP_DEVICE_INTERFACE_DATA structure which is probably not a problem but you never know.

SP_DEVICE_INTERFACE_DATA devInterfaceData = {0};
devInterfaceData.cbSize = sizeof(devInterfaceData);

Dialog Box DDX problem

kitty519-Jul-06 8:13

kitty5

19-Jul-06 8:13

Background:
I first created an MDI MFC application called test.

I then created a dialog named: IDD_MANUAL_CDIN.
This does simple data exchange:
User inputs a string in edit box1 (i.e. hello).
User clicks on "SEND" button.
User should see in edit box2 "I typed: hello".

I then created a class for that dialog which is implemented in manual.cpp:

<br />
#include "stdafx.h"<br />
#include "test.h"<br />
#include "manual.h"<br />
<br />
// manual dialog<br />
IMPLEMENT_DYNAMIC(manual, CDialog)<br />
<br />
manual::manual(CWnd* pParent /*=NULL*/)<br />
	: CDialog(manual::IDD, pParent)<br />
	, m_nIn(_T("init"))<br />
	, m_nSent(_T("I sent "))<br />
{}<br />
<br />
void manual::DoDataExchange(CDataExchange* pDX)<br />
{<br />
	CDialog::DoDataExchange(pDX);<br />
	DDX_Text(pDX, IDC_IN, m_nIn);<br />
	DDX_Text(pDX, IDC_SENT, m_nSent);<br />
}<br />
<br />
BEGIN_MESSAGE_MAP(manual, CDialog)<br />
	ON_BN_CLICKED(IDC_BUTTON_SEND, &manual::OnButtonSend)<br />
END_MESSAGE_MAP()<br />
<br />
// App command to run the dialog<br />
void manual::OnManual()<br />
{<br />
	manual manualDlg;<br />
	manualDlg.DoModal();<br />
}<br />
// manual message handlers<br />
<br />
void manual::OnButtonSend()<br />
{<br />
	// TODO: Add your control notification handler code here<br />
	AfxMessageBox(tempSend); //DEBUG<br />
	AfxMessageBox(m_nIn); //DEBUG<br />
	m_nSent += m_nIn;<br />
}<br />

and manual.h:

<br />
class manual : public CDialog<br />
{<br />
	DECLARE_DYNAMIC(manual)<br />
<br />
public:<br />
	manual(CWnd* pParent = NULL);   // standard constructor<br />
	virtual ~manual();<br />
	afx_msg void OnManual();<br />
<br />
// Dialog Data<br />
	enum { IDD = IDD_MANUAL_CDIN };<br />
<br />
protected:<br />
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support<br />
<br />
	DECLARE_MESSAGE_MAP()<br />
public:<br />
	CString m_nIn;<br />
	CString m_nSent;<br />
	afx_msg void OnButtonSend();<br />
};<br />

I then changed the toolbar created by the MFC App wizard so that when you click one button it will open a dialog that corresponds to that button.
All this code is in the test.cpp file:
I do:

<br />
#include "manual.h"<br />
BEGIN_MESSAGE_MAP(CSpaceCubeDataRxApp, CWinApp)<br />
	ON_COMMAND(ID_MCD_INPUT, &manual::OnManual)<br />
	ON_COMMAND(ID_APP_ABOUT, &CtestApp::OnAppAbout)<br />
	// Standard file based document commands<br />
	ON_COMMAND(ID_FILE_NEW, &CWinApp::OnFileNew)<br />
	ON_COMMAND(ID_FILE_OPEN, &CWinApp::OnFileOpen)<br />
END_MESSAGE_MAP()<br />

Question:
After compiling I go to type in the string "hello" and click send and nothing pops up in edit box2. I know the "SEND" button function works b/c of the DEBUG AfxMessageBox the I put in it. Nothing is assigned to the variable m_nIn. The data exchange isn't working.

What am I missing?

Kitty5

Re: Dialog Box DDX problem

Michael Dunn19-Jul-06 8:30

Michael Dunn

19-Jul-06 8:30

DDX doesn't happen automagically, you need to call UpdateData() to transfer the data between the controls and variables.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: Dialog Box DDX problem

kitty519-Jul-06 8:32

kitty5

19-Jul-06 8:32

DUH!

I knew it was something simple...

Kitty5

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