C / C++ / MFC

Re: *.vcproj Is this a VC++ file

12-Nov-05 2:07

I HAVE downloaded a important project file which has few
*.c and *.h files and other file as *.vcp(VCPROJ) do anyone
know what type of file is this and is it related to any MVStudio.
thank you

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Mircea Puiu12-Nov-05 3:39

Mircea Puiu

12-Nov-05 3:39

Visual C++ writes and uses a number of files during the build process.
.VCP is the Workspace (project) information file, which is the Visual C++ equivalent of the 16-bit version .WSP file.

If you build your program outside the IDE, you may use a makefile to invoke the command-line tools. If you build your program within the IDE, the embedded Visual C++ project system uses the project (.vcp) files to store thr make information.

SkyWalker

-- modified at 17:48 Saturday 12th November, 2005

Re: *.vcproj Is this a VC++ file

Gary R. Wheeler12-Nov-05 6:25

Re: *.vcproj Is this a VC++ file

12-Nov-05 6:25

.vcproj is the extension used for Visual Studio 2002 and 2003 project files.

Software Zen: delete this;

vikas amin12-Nov-05 21:16

*.vcproj Is this a VC++ file

12-Nov-05 21:16

Thank you

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

vikas amin12-Nov-05 2:06

ATL COM String Property issue

12-Nov-05 2:06

Axonn Echysttas12-Nov-05 0:48

12-Nov-05 0:48

Hi everybody ::- ). I got an issue with some ATL thingy I'm working on. I made an ATL DLL which I use in Visual Basic 6. To set or get a string property I use BSTR, since Visual Basic uses this type. A value from VB6 successfully reaches VC++ 6. But not the other way around. Here's the VC++ code.

BSTR test; //<- this is actually declared in the CASDINIFile class.<br />
STDMETHODIMP_(HRESULT) CASDINIFile::get_ASDOperator(BSTR *pVal)<br />
{<br />
	AFX_MANAGE_STATE(AfxGetStaticModuleState())<br />
		<br />
		pVal = &test;<br />
	<br />
	return NULL;<br />
}<br />
<br />
STDMETHODIMP_(HRESULT) CASDINIFile::put_ASDOperator(BSTR newVal)<br />
{<br />
	AFX_MANAGE_STATE(AfxGetStaticModuleState())<br />
		<br />
		test = newVal;<br />
	<br />
	return NULL;<br />
}

The VB code isn't of relevance. I say myatlobj.ASDOperator = "bla bla" and then try to query the value (and I get nothing). Of course, the problem lies in this line probably:

pVal = &test;

So the function REQUIRES me to give pVal a BSTR *. So I give the address of &test but obviously, it ain't working since probably VB 6 wants a simple BSTR. If I try to change the BSTR * to BSTR I this error from VC++:

error MIDL2121 : [out] only parameter must not derive from a top-level [unique] or [ptr] pointer/array : [ Type 'wireBSTR' ( Parameter 'pVal' ) ]

-= E C H Y S T T A S =-
The Greater Mind Balance

Gary R. Wheeler12-Nov-05 6:44

12-Nov-05 6:44

In get_ASDOperator you are passed a pointer to a BSTR. If you assign a value to that pointer, you've only affected the local copy of the pointer, not the BSTR that the original argument pointed to. Also, you've said that this is an [out] parameter, which means that you need to set the value that is pointed to.

What you want to do is something like this:

*pVal = ::SysAllocString(L"Return this string");
// or, if you have a CString handy
CString return_value;
*pVal = return_value.AllocSysString();

Software Zen: delete this;

Axonn Echysttas12-Nov-05 8:23

12-Nov-05 8:23

Hi Gary, thanks for answering. I'm not an expert in VC++ but wasn't it supposed to be SysAllocString? Also, isn't this a memory leak? Where do we Free that string? Anyway, for all of you that stumble or will stumble upon this problem, the answer is:

<br />
STDMETHODIMP CASDINIFile::get_Operator(BSTR *pVal)<br />
{<br />
  AFX_MANAGE_STATE(AfxGetStaticModuleState())	<br />
  CComBSTR sToReturn;<br />
  sToReturn.Attach(<YourBSTRVariableHERE>);<br />
  sToReturn.CopyTo(pVal);<br />
  sToReturn.Detach();<br />
  return S_OK;<br />
}

Or at least this is the method I used ::- D.

And probably something like this will also work: (though I didn't test it!)

<br />
//Retrieves the current Operator used when loading or saving INI files.<br />
STDMETHODIMP CASDINIFile::get_Operator(BSTR *pVal)<br />
{<br />
  AFX_MANAGE_STATE(AfxGetStaticModuleState())	<br />
  BSTR *sToReturn = (BSTR *)pVal;<br />
  *sToReturn = <YourBSTRVariableHERE>;<br />
  return S_OK;<br />
}

Have fun ::- ).

-= E C H Y S T T A S =-
The Greater Mind Balance

Gary R. Wheeler12-Nov-05 10:26

12-Nov-05 10:26

Axonn Echysttas wrote:
wasn't it supposed to be SysAllocString

The CString member that returns a BSTR is called AllocSysString, for some strange reason.

Axonn Echysttas wrote:
isn't this a memory leak

The rule with BSTR's is the producer allocates it, and the consumer SysFreeString's it. In your case, it will be the caller's job to free the string.

Software Zen: delete this;

Axonn Echysttas12-Nov-05 13:14

12-Nov-05 13:14

You're overlooking the fact that the caller is VB, and VB is too retarded to free it *laugh* ::- ). Anyway, the job's done, hooray. In the meantime I ran in another "doodle". Check the above message if you wish to help ::- ) - actually it's too late to run from me since you're already in my "Thanks to" list ::- >.

-= E C H Y S T T A S =-
The Greater Mind Balance

Gary R. Wheeler12-Nov-05 15:36

12-Nov-05 15:36

It wouldn't surprise me to find that VB frees the string automatically when the corresponding value goes out of scope. VB is where BSTR's got their start anyway; BSTR stands for BASIC STRing.

Software Zen: delete this;

Axonn Echysttas12-Nov-05 20:37

12-Nov-05 20:37

Basic String. Hehe. I didn't know that. Hm anyway, it doesn't free it. I already stumbled upon it. My first method to pass the string to VB was to create a global CComBSTR object. And guess what?? After the VB function that contained the instance of the ATL object finished execution, boom, crash (in VC++...). So VC++ was alerting me of the memory leak. So then I placed a .Detach() command to the CComBSTR back in the destructor of the ATL and no more errors ::- D. SO no, VB does not do it... ::- ).

-= E C H Y S T T A S =-
The Greater Mind Balance

unicode problem

torniker11-Nov-05 22:15

torniker

11-Nov-05 22:15

i want to write in my script and in text feild too by using unicode (in georgian).

what should i do?

i wrote it in script after compiling there were two errors thay said that visual c++ doesn't support unicode Frown | :(

Programistebo saqartvelosi sheertdit Wink | ;)

Re: unicode problem

Jacky Tsee12-Nov-05 6:09

Jacky Tsee

12-Nov-05 6:09

Define _UNICODE in the header file.
Please search for more infomation of using unicode programming in MSDN.

Re: unicode problem

torniker13-Nov-05 0:32

torniker

13-Nov-05 0:32

thanks!

could you please tell me where can i find info about this or i want to find manual for Visual C++

Programistebo saqartvelosi sheertdit Wink | ;)

Re: unicode problem

Gary R. Wheeler13-Nov-05 4:52

MSHFlexGrid problem (First-chance exception in ACE.exe (MSHFLXGD.OCX): 0xC0000005: Access Violation.)

13-Nov-05 4:52

Try using the MSDN[^] web site first.

Software Zen: delete this;

Wndows hook

act_x11-Nov-05 22:07

act_x

11-Nov-05 22:07

I created a Global hook by creating a DLL that listens for the WH_SHELL message . I get notifications for all top level window creations .

Now I have a method in my DLL that looks like

MYShellProc(code , wParam ,Lparam)
{

...
return CallNextHook(....)

}

void DoSomething()
{

CEvent myEvent l
..
..
event->Lock(15000);

}

It is during this wait that I DO NOT GET any SHELL notifications during the wait . Is it due to the fact that my main thread is blocked in the wait ? Are there any workarounds ?

-- modified at 4:08 Saturday 12th November, 2005

lcm311-Nov-05 18:45

lcm3

11-Nov-05 18:45

inGrid is a MSHFlexGrid object.

...
...
inGrid.Clear();
inGrid.SetCols( 0, 3); //This line sometimes cause Access Violation problem.
...
...

Do anyone ever had this problem or know how to solve it?

Here's the call stack when the problem happen
==================================
MSHFLXGD! 01a908d0()
MSHFLXGD! 01a79abb()
MSHFLXGD! 01a75b2f()
MSHFLXGD! 01a8fdc6()
MSHFLXGD! 01a72d31()
OLEAUT32! 779d7d5d()
OLEAUT32! 77a2310e()
MSHFLXGD! 01a95945()
MSHFLXGD! 01a7dd7c()
COleDispatchDriver::InvokeHelperV(long 5, unsigned short 4, unsigned short 0, void * 0x00000000, const unsigned char * 0x006a01dc parms, char * 0x0012f7e4) line 345 + 54 bytes
COleControlSite::InvokeHelperV(long 5, unsigned short 4, unsigned short 0, void * 0x00000000, const unsigned char * 0x006a01dc parms, char * 0x0012f7dc) line 976
CWnd::InvokeHelper(CWnd * const 0x016f2550 {CSelectionGrid hWnd=0x00320ce8}, long 5, unsigned short 4, unsigned short 0, void * 0x00000000) line 354
MSHFlexGrid::SetCols(long 0, long 3) line 56 + 30 bytes

-- modified at 0:46 Saturday 12th November, 2005

Problem in using SAFEARRAY

BlrBoy11-Nov-05 18:40

BlrBoy

11-Nov-05 18:40

Hello All

I want to store a BINARY file content (size of the BINARY file can be from 4 to 30 MB) to SAFEARRAY. I am reading the file content in BYTE*. For storing the data to SAFEARRAY, I found the API SafeArrayPutElement. But using this I have to copy BYTE by BYTE. Is there any way to copy full data of type BYTE* or char* or CString to SAFEARRAY?

Currently I am using

for(nBufIndex=0; nBufIndex < nFileSize; nBufIndex++)<br />
{<br />
	hr = SafeArrayPutElement(l_pSafeArray, &l_lSAIndex, &pBuffer[nBufIndex]);<br />
	l_lSAindex++;<br />
}

Thanks for your time
Ravi

Re: Problem in using SAFEARRAY

Mircea Puiu12-Nov-05 3:54

Mircea Puiu

12-Nov-05 3:54

// Assume pMemData is pointing to you data in memory
SAFEARRAY *psa;
// create the safe array to store the data
psa = SafeArrayCreateVector( VT_UI1, 0, LengthInBytes ); // use what is 
                                                         //appropriate for 
                                                         // LengthInBytes
unsigned char *pData = NULL;
SafeArrayAccessData( psa, (void**)&pData ); // get pointer, lock array
memcpy( pData, pMemData, LengthInBytes ); // copy everything at once
// ... do what ever else you need ....
SafeArrayUnaccessData(psa); // unlock access to safearray
// ... do something ... as you have your pointer to the allocated SAFEARRAY

SkyWalker

Showing and hiding

romuzu11-Nov-05 16:56

romuzu

11-Nov-05 16:56

im creating a helper class to hide and show the following controls:
ControlBar
ReBar
ToolBar
DialogBar
StatusBar.

my problem is i dont know how to hide/show those items using a class. If you know some articles or links or you know how to do it, please reply to my post.
Thanks! Your help is deeply appreciated.

Re: Showing and hiding

vikas amin11-Nov-05 23:00