C / C++ / MFC

FindResourceEx not working ???????

12-Mar-02 9:52

Try with bool nocase_compare(const Ranger& a,const Ranger& b).
Also, *start and *stop must be of the same type as key (which they are currently not, I think).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Wolfram Steinke12-Mar-02 9:33

Wolfram Steinke

12-Mar-02 9:33

I have come across an interesting problem. I have a Resource only DLL which contains only string tables in about 7 languages. Using the resource editor I can confirm that the Dll is built correctly.

In InitInstance of my app I call LoadLibrary and save the returned handle. ( m_hInstDLL )

The I added a function for extracting the strings. This is when the fun starts.

This code works and returns the string from the default language table.

HINSTANCE hInst = AfxGetResourceHandle();
CString theString;
AfxSetResourceHandle( m_hInstDLL );
theString.LoadString( IDS_TESTDTRING );
AfxSetResourceHandle( m_hInst );

However if I use the FindResource or FindResourceEx functions they fail as in the following code.

HINSTANCE hInst = AfxGetResourceHandle();
CString theString;
AfxSetResourceHandle( m_hInstDLL );
theString.LoadString( IDS_TESTDTRING );
HINSTANCE hInst2 = AfxFindResourceHandle(MAKEINTRESOURCE(IDS_TESTSTRING), RT_STRING);
HRSRC hRes = ::FindResource(hInstDLL,MAKEINTRESOURCE(IDS_TESTSTRING), RT_STRING);
......
AfxSetResourceHandle( m_hInst );

The interesting thing is that AfxFindResourceHandle returns the same value as hInstDLL, as it should. This means that AfxFindResourceHandle finds the string resource. FindResource on the other hand returns 0.
Calling FindResourceEx with the appropriate language code also returns 0.

What makes this even more confusing is that in searching through MSDN it is stated that AfxFindResourceHandle actually calls FindResource.

Ideas anyone? It must be possible to make it work.

Happy programming!!

Re: FindResourceEx not working ???????

Joaquín M López Muñoz12-Mar-02 9:50

Re: FindResourceEx not working ???????

12-Mar-02 9:50

AfxSetResourceHandle( m_hInstDLL );
theString.LoadString( IDS_TESTDTRING );
HINSTANCE hInst2 = AfxFindResourceHandle(MAKEINTRESOURCE(IDS_TESTSTRING), RT_STRING);
HRSRC hRes = ::FindResource(hInstDLL,MAKEINTRESOURCE(IDS_TESTSTRING), RT_STRING);

This might be an absolutely irrelevant question, but have you noticed you're using two variables m_hInstDLL and hInstDLL? Do they store the same value?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Wolfram Steinke12-Mar-02 10:15

Wolfram Steinke

12-Mar-02 10:15

That is a typo in here, it is actually m_hInstDLL.

Happy programming!!

I found 2 issues in ATL 7.0 Service projects: Should I put this somewhere here?

Le centriste12-Mar-02 8:19

Le centriste

12-Mar-02 8:19

I found 2 issues in ATL 7.0 (code in atlbase.h) regarding services. I may or may not be right, some of you will tell me if I'm not. Here they are:

1- A service with no COM interface refuses to start

When creating a service, and you don't define any COM object in it (let's say you want to write a service in ATL, but don't have any use of a COM server in it), it won't start with the SCM reporting that it refuses to start without returning an error code.

This is because of the call to RegisterClassObjects in CAtlExeModule<T>::PreMessageLoop(). When there is no object to register, this method returns S_FALSE. In the CAtlServiceModule<T>::Run() method, there is a line that says:

if (hr == S_OK) {
    //...
}

The problem with that is that hr = S_FALSE. Replace with the following:

if (SUCCEEDED(hr)) {
    //...
}

Some may argue that there is no point in having a service not exposing a COM object. To those I say "hey, COM is not the only thing that a server could implement". Heh. And I like to write services using ATL because it is easy.

2- Multithreaded service

If you write a service containing objects with the "free" threading model, you may want to change the _ATL_APARTMENT_THREADED define to _ATL_FREE_THREADED in stdafx.h. I can tell you upfront that your service will start but you won't be able to activate any of the COM objects in it.

The problem is with the m_bDelayShutdown member variable in CAtlExeModule<T>, from which CAtlServiceModule<T> derives. In CAtlServiceModule<T>::ServiceMain, this member is set to false, probably because it is irrelevant (and maybe harmful, who knows) in a service.

This generates a problem in CAtlExeModule<T>::PreMessageLoop. Look at this snippet from the function:

hr = pT->RegisterClassObjects(CLSCTX_LOCAL_SERVER, 
			REGCLS_MULTIPLEUSE | REGCLS_SUSPENDED);

if (FAILED(hr))
    return hr;

if (hr == S_OK)
{
    if (m_bDelayShutdown)
	{
		CHandle h(pT->StartMonitor());
		if (h.m_h == NULL)
		{
			hr = E_FAIL;
		}
		else
		{
			hr = CoResumeClassObjects();
			ATLASSERT(SUCCEEDED(hr));
			if (FAILED(hr))
			{
				::SetEvent(m_hEventShutdown); 						::WaitForSingleObject(h, m_dwTimeOut * 2);
			}
		}
	}

	if (FAILED(hr))
		pT->RevokeClassObjects();
        }
	else
	{
		m_bDelayShutdown = false;
	}

NOTE: This code is only available with _ATL_FREE_THREADED defined.

As your keen eye may have noticed (see the bolded lines of code if not), the RegisterClassObjects method is called with the REGCLS_SUSPENDED flag. This requires a call to CoResumeClassObjects in order for a client to be able to activate an object from your exec.

If you read the code carefully, this method is never called if m_bDelayShutdown is set to false. What I did is simply override the PreMessageLoop method (tell me if you don't know how to do it), and modify it as follow (see bolded line of code):

hr = pT->RegisterClassObjects(CLSCTX_LOCAL_SERVER, 
			REGCLS_MULTIPLEUSE | REGCLS_SUSPENDED);

if (FAILED(hr))
    return hr;

if (hr == S_OK)
{
    if (m_bDelayShutdown)
	{
		CHandle h(pT->StartMonitor());
		if (h.m_h == NULL)
		{
			hr = E_FAIL;
		}
		else
		{
			hr = CoResumeClassObjects();
			ATLASSERT(SUCCEEDED(hr));
			if (FAILED(hr))
			{
				::SetEvent(m_hEventShutdown); 						::WaitForSingleObject(h, m_dwTimeOut * 2);
			}
		}
	} else {
               // Error handling not shown for clarity
               hr = CoResumeClassObjects();
        }

	if (FAILED(hr))
		pT->RevokeClassObjects();
        }
	else
	{
		m_bDelayShutdown = false;
	}

This will make your objects available to the outside world.

------------------------------------------------------------------------------

I don't know if I'm right or not, but it resolved some issues for me. If some of you find that what I'm saying is completely dumb, please demonstrate.

Tx for listening

Michel

If I am wrong or said something stupid, I apologize in advance Wink | ;)

Re: I found 2 issues in ATL 7.0 Service projects: Should I put this somewhere here?

Tomasz Sowinski12-Mar-02 8:57

CFileDialog UNICODE concern

12-Mar-02 8:57

Write an article describing these issues. Your post in VC++ board will soon become old and nobody (ok, *almost* nobody) will be able to find it.

Tomasz Sowinski -- http://www.shooltz.com

12-Mar-02 8:12

Hello,

I'm having a problem with the CFileDialog class in a UNICODE build. I'm overriding the OnFileNameOK function, and upon entering the function, I'm finding that the nFileOffset and nFileExtension variables in the OPENFILENAME struct have not been set (or were set to 0) after DoModal called GetSaveFileName. The rest of the struct is filled out appropriately, and it is clear that nFileOffset should be a non zero value. In a non unicode build, the variables are set correctly. Am I missing something? Any help would be greatly appreciated.

Thanks,
SQ

Joaquín M López Muñoz12-Mar-02 9:16

12-Mar-02 9:16

Can you show some snippet of the offending code? Are you sure you haven't forgot some _T (or TEXT) somewhere? How do you check the value of those parameters (OutputDebugString, debugger watch, other)?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

12-Mar-02 10:55

I can see the same behavior in an otherwise empty project that has a class CFDialag derived from CFileDialog, with one overridden function OnFileNameOK. I set a breakpoint at the top of OnFileNameOK and call:

CFDialog saveAsFileDlg(FALSE,NULL,NULL,OFN_EXPLORER,NULL,AfxGetMainWnd());
saveAsFileDlg.DoModal();

After entering a filename in the dialog box and clicking OK, the breakpoint hits and the ofn.nFileOffset variable is 0. The same virtually empty project compiled without UNICODE correctly sets the nFileOffset variable to 11 (the number of characters in the selected path).

-SQ

Joaquín M López Muñoz12-Mar-02 20:00

12-Mar-02 20:00

Excuse me for asking the obvious, but are you trying your project in a Unicode-enabled platform (NT 4.0/2000/XP)?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

13-Mar-02 5:00

Yes, I'm using 2000. All of the other UNICODE functions seem to be working correctly...

-Scott

Printing - size of font

Wizard_0112-Mar-02 4:42

Wizard_01

12-Mar-02 4:42

Hi
could you help me who to print text in "Arial CE" 12px ? ( in map mode MM_HIMETRIC).
I use CFont::CreateFontIndirect, but I don't which font size have to I set.

Wiizi Smile | :)

Tomasz Sowinski12-Mar-02 4:56

12-Mar-02 4:56

Use CreatePointFont or CreatePointFontIndirect and pass the printer DC.

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski12-Mar-02 5:00

12-Mar-02 5:00

Previous answer assumes that you're going to create 12 point font. However, px from your post suggests pixels. 12 pixels on the printer is too small - you'll get little rectangles instead of words.

Tomasz Sowinski -- http://www.shooltz.com

Wizard_0112-Mar-02 5:02

Wizard_01

12-Mar-02 5:02

Sorry, I need print font which has same size as on all printers.

Wiizi Smile | :)

Tomasz Sowinski12-Mar-02 5:09