ATL / WTL / STL

AccessibleObjectFromWindow returns E_ACCESSDENIED

27-Nov-12 23:34

The results of both parts of your !IF expression are the same. I have not used VC6 for many years, but the later versions need some other function to copy the source file to the project directory. Take a look at how the other files are handled.

One of these days I'm going to think of a really clever signature.

BCN-16325-Nov-12 23:04

BCN-163

25-Nov-12 23:04

I called

C++

AccessibleObjectFromWindow(hPDFDoc, OBJID_NATIVEOM, IID_IDispatch, (void**)&pDisp );

to get an interface to access PDF files. but in xp it returns an error E_ACCESSDENIED. when in win7 it works fun. I guess that I didn't have enough authority.
I tried some setting on my computer, but all failed, I really have no more idea of this.
Any tip would be great helpful.

How to use NTGraph3D Activex Control in Visual Studio 2010.

DhrumilS23-Nov-12 0:44

DhrumilS

23-Nov-12 0:44

Visual Studio C++ provides facility for using ActiveX control in VC6.0 as well as in VC2010. I tried NTGraph3D activeX Control in VC6.0. It is working perfectly.

I tried the same in VC 2010. So for Visual Studio 2010, NTGraph3D ActiveX Control is not working.

So can anyone help me to solve this problem. Is there any change in properties ?

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hacker240union22-Nov-12 23:40

hacker240union

22-Nov-12 23:40

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copying AAComBSTR to BYTE

V K 220-Nov-12 20:56

V K 2

20-Nov-12 20:56

Can anybody help me in copying AAComBSTR to BYTE. Is there any API available which does this copy.

Your help is appreciated.

Re: copying AAComBSTR to BYTE

Richard MacCutchan20-Nov-12 21:28

Re: copying AAComBSTR to BYTE

20-Nov-12 21:28

Try CComBSTR::BSTRToArray()[^].

One of these days I'm going to think of a really clever signature.

hacker240union22-Nov-12 23:27

hacker240union

22-Nov-12 23:27

C++ Delegate/Events

EDanaII14-Nov-12 17:15

EDanaII

14-Nov-12 17:15

Greetings,

I just recently started some experiments with C++. I'm an experienced programmer, but not with C++, but, just for fun, I decided to implement this example C++ Delegate here on Code Project.

This example keeps the methods hooked into the delegate inside structs. In the example given these are: struct TShapes, struct TDerivedShapes and struct TThings. These are then initialized in this fashion: event += new MyEvent::T<tshapes>(&shapes, &TShapes::Square);

My question is this: is it necessary to store the methods to be hooked into these events into a struct? I assume this is done because the struct makes the address available to be used in the delegate. If the answer to this question is no, then how do you hook into the even just through standard methods within a normal C++ program? Please forgive the stupidity of my questions. Smile | :)

Ed.

Richard MacCutchan14-Nov-12 20:57

14-Nov-12 20:57

Take a look at function pointers[^].

One of these days I'm going to think of a really clever signature.

EDanaII15-Nov-12 13:35

EDanaII

15-Nov-12 13:35

Well, thanks, but that's not quite what I asked. Smile | :)

I was wondering if it was required to embed your methods in a struct for the example identified. If by your response you meant "yes, they must be embedded" then an explicit answer would be appreciated.

Thanks again.

Ed.

Richard MacCutchan15-Nov-12 23:45

15-Nov-12 23:45

Edward G Dana wrote:
Well, thanks, but that's not quite what I asked.

Sorry, I misunderstood. But I think your question should really be directed at the author of the article.

One of these days I'm going to think of a really clever signature.

pasztorpisti20-Nov-12 2:53

pasztorpisti

20-Nov-12 2:53

C++ doesn't natively support delegates and delegate implementation in C++ is quite messy especially if you try to support methods with variable number of parameters and parameter types - it also involves super-ugly method pointer casting. Delegates are simply ugly in C++, I recommend never using them if it isn't necessary. (For me using delegates is necessary only if a used 3rd party library makes it necessary to use delgates in its public interface...) I always prefer using old-school listener interfaces with old-school virtual methods (classes with pure or empty-bodied virtual methods only) to listen for events. Always consider alternatives and prefer readability of the resulting code. It doesn't worth trying to shape C++ into C#!

Return FALSE in InitInstance causes crash in 64Bits

EDanaII20-Nov-12 16:23

EDanaII

20-Nov-12 16:23

This is just me experimenting and playing. Seeing what I can do and make C++ do, for fun. Smile | :)

MrKBA8-Nov-12 1:01

MrKBA

8-Nov-12 1:01

I have an executable compiled with x64 configuration.
I need to test it on Windows 7 64 bits.
when I run it, it crash when I return FALSE in InitInstance function.

BOOL CMyApp::InitInstance()
{
    if (IsAppAlreadyStarted())
        return FALSE;

    InitCommonControls();

    CWinApp::InitInstance();

    // Initialize OLE libraries
    if (!AfxOleInit())
    {
        AfxMessageBox(IDP_OLE_INIT_FAILED);
        return FALSE;
    }
    AfxEnableControlContainer();

    if(!CheckModule())
    {
        return FALSE; // after call application crash
    }
}

when it is compiled with x32bits configuration and run on Windows 7 x64 there is no probleme.
Just when it is compiled with x64.

any help please?

Re: Return FALSE in InitInstance causes crash in 64Bits

Albert Holguin10-Dec-12 4:30

Albert Holguin

10-Dec-12 4:30

I'd venture to say that something in CheckModule() is causing the crash and not returning FALSE. Although by returning FALSE you are indicating a failure on initialization anyway, so I'm not sure how gracefully it's supposed to go down after that.

How to get used dll's path information programetically?

litu kumar6-Nov-12 19:38

Re: How to get used dll's path information programetically?

6-Nov-12 19:38

Hi,
I'm using a .net dll in a Win32 application.
I want to print the DLL file location programetically.

I tried like as below , but it still displaying the EXE's (generated by my win32 app.) path -
-----------------------------------------------------------
HMODULE hmod = GetModuleHandle(TEXT("MyApp.dll"));
TCHAR szPath[MAX_PATH + 1] = {0};
DWORD dwLen = GetModuleFileName(hmod, szPath, MAX_PATH);
wprintf(L"CURRENT DIRECTORY: %s\n" ,szPath);
-----------------------------------------------------------

Please advice any new solution or any correction required (above code stuff) for the same.

Richard MacCutchan6-Nov-12 21:40

Re: How to get used dll's path information programetically?

6-Nov-12 21:40

The chances are that hmod is NULL because MyApp.dll has not been loaded into memory as required by the GetModuleHandle()[^] function. Always check return values from API calls, do not just assume that it works.

One of these days I'm going to think of a really clever signature.

litu kumar6-Nov-12 23:27

Re: How to get used dll's path information programetically?

6-Nov-12 23:27

Hi Richard,

You mean to initialize 'hmod' to NULL as below -

HMODULE hmod =NULL;
hmod= GetModuleHandle(TEXT("MyApp.dll"));
if(hmod!=NULL)
{
DWORD dwLen = GetModuleFileName(hmod, szPath, MAX_PATH);
wprintf(L"CURRENT DIRECTORY: %s\n" ,szPath);
}
====================================
If the above code stuff as per your indication,then 'GetModuleHandle' not returning NULL .
And it printing the path of EXE not of required 'MyApp.dll'

Kindly guide me if i understood the wrong thing.

modified 7-Nov-12 6:38am.

Richard MacCutchan7-Nov-12 4:54

Re: How to get used dll's path information programetically?

7-Nov-12 4:54

No, I mean the value returned from GetModuleHandle() is NULL if that library has not been loaded into your address space. In which case you will get the path of your executable. Check the link to the documentation that I gave you.

One of these days I'm going to think of a really clever signature.

litu kumar7-Nov-12 17:11

Re: How to get used dll's path information programetically?

7-Nov-12 17:11

Hi Richard,

I'm beginner to this area. I also gone through that document you sent me and got some idea.
But unable to conclude any way to get information on loaded DLL.

Actual requirement is to get both Dll's - "physical location" & "Version" information programeically from a Win32(vc++) application.

I tried 2-3 ways but still failing to fulfill my requirement.

Kindly share a detailed way or code then it will great to learn.

Richard MacCutchan7-Nov-12 21:34

Re: How to get used dll's path information programetically?

7-Nov-12 21:34

As I said before, you must load the DLL first, using the LoadLibrary()[^] function. Only then can you get the full path details. As to version information, you need the Version Information Functions[^].

One of these days I'm going to think of a really clever signature.

litu kumar7-Nov-12 22:35

Re: How to get used dll's path information programetically?

7-Nov-12 22:35

Thanks Richard,

Its working fine by using LoadLibrary().
Extracting the DLL's version info - i have check.

Mean while for my knowledge purpose ,can you please clarify one doubt.

Even though we are adding DLL reference through project-proporties, why it was still printing the application's Exe path (please refer the code stuff in my last reply) ??

Thanks

Richard MacCutchan8-Nov-12 0:16

Re: How to get used dll's path information programetically?

8-Nov-12 0:16

litu kumar wrote:
why it was still printing the application's Exe path

I have already explained twice. If the DLL has not been loaded into your application's address space then the call to GetModuleHandle() will return NULL; something that you have not catered for in your code. If the module handle is NULL then GetModuleFileName() will return the path of your executable program. The sequence you should follow is:

C++

HMODULE hmod = LoadLibrary(TEXT("MyApp.dll"));
if (hmod != NULL)
{
    TCHAR szPath[MAX_PATH + 1];
    DWORD dwLen = GetModuleFileName(hmod, szPath, MAX_PATH);
    if (dwLen > 0)
    {
        wprintf(L"CURRENT DIRECTORY: %s\n" ,szPath);
    }
    else
    {
        // check GetLastError() for reason
    }
}
else
{
// display error message
}

One of these days I'm going to think of a really clever signature.

litu kumar8-Nov-12 2:58