C / C++ / MFC

17-Apr-11 1:41

#include <stdlib.h>
#include <stdio.h>

void main( void )
{
int i;
char *pmbnull = NULL;
char *pmbhello = (char *)malloc( MB_CUR_MAX );
wchar_t *pwchello = L"Hi";
wchar_t *pwc = (wchar_t *)malloc( sizeof( wchar_t ));

printf( "Convert to multibyte string:\n" );
i = wcstombs( pmbhello, pwchello, MB_CUR_MAX ); // Look here !
printf( "\tCharacters converted: %u\n", i );
printf( "\tHex value of first" );
printf( " multibyte character: %#.4x\n\n", pmbhello );

printf( "Convert back to wide-character string:\n" );
i = mbstowcs( pwc, pmbhello, MB_CUR_MAX ); // And here !
printf( "\tCharacters converted: %u\n", i );
printf( "\tHex value of first" );
printf( " wide character: %#.4x\n\n", pwc );
}

Best wish!

Visual Studio 4.1

venkat11615-Apr-11 19:15

venkat116

15-Apr-11 19:15

Hi All,

Where can i get the visual studio 4.1 software for downloading?

Re: Visual Studio 4.1

«_Superman_»15-Apr-11 21:17

«_Superman_»

15-Apr-11 21:17

There is no software called Visual Studio 4.1.
You can however get to download Visual C++ 4.2 and Visual Basic 4.0 separately.
For this you will need to buy an MSDN Subscription.
I even see older vesions like Visual C++ 1.52 and Visual Basic 2.0 in the subscription that I have.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Algorithm [modified]

Cyclone_S15-Apr-11 13:40

Cyclone_S

15-Apr-11 13:40

Hi, I am coding an algorithm that searches for a box on the screen. So far I got the snake to find the food which works great except that for example. If the snake is moving right it will sometimes move left and move ontop of it's self. I've spent awhile trying to figure it out on my own with no success. I think it has to do with the two blocks of if statements but I'm not sure. Maybe they need to be combined somehow? This is the last thing I need to figure out and my program is finished. Thanks in advance.

I tried.

if(direction_comp!=1){direction_comp=-1;} else {direction_comp=2;}  // If snake is not moving left then move it right else move it up to avoid it from moving on top of it's self.

direction_comp of 1 = left;
direction_comp of -1 = right;
direction_comp of 2 = up;
direction_comp of -2 = down;

void comp_direction()
			{


				if(segments_comp[head_comp]->panel->Left <= Food->Left)
				{	
					if(segments_comp[head_comp]->panel->Top >= Food->Top){direction_comp =2;}
					else{direction_comp=-1;}
				}
				else if(segments_comp[head_comp]->panel->Left >= Food->Left)
				{	
					if(segments_comp[head_comp]->panel->Top >= Food->Top){direction_comp =2;}
					else{direction_comp=1;}

				}
				if(segments_comp[head_comp]->panel->Top <= Food->Top)
				{
					if(segments_comp[head_comp]->panel->Left <= Food->Left){direction_comp =-1;}
					else{direction_comp=-2;}
					
				}
				else if(segments_comp[head_comp]->panel->Top >= Food->Top)
				{
					if(segments_comp[head_comp]->panel->Left >= Food->Left){direction_comp =1;}
					else{direction_comp=2;}
				}

			}

modified on Friday, April 15, 2011 7:47 PM

Re: Algorithm

Hans Dietrich15-Apr-11 18:07

15-Apr-11 18:07

You may get a better response by posting here: http://www.codeproject.com/Forums/326859/Algorithms.aspx[^]

Best wishes,
Hans

VC, Linker Tools Warning LNK4086

refla15-Apr-11 13:22

15-Apr-11 13:22

I have a VC project built by VC6 was a MFC app format.

Last year, someone convert it to MFC DLL format and I have to turn it backup, now!

I used VC2008 + sp1 do it, but I got a warning:

Linker Tools Warning LNK4086: entrypoint '_wWinMainCRTStartup' is not __stdcall with 12 bytes of arguments; image may not run.

How to overcome it ?

Best Regard!

Hans Dietrich15-Apr-11 18:55

15-Apr-11 18:55

Without seeing the code, it's hard to say what the problem is.

If you can't figure this out, maybe you should consider creating an empty MFC app, and then adding the code from the DLL, piece by piece.

Best wishes,
Hans

refla17-Apr-11 1:31

17-Apr-11 1:31

Hi, Hans

THX Smile | :)

ye, after I pieced code from the DLL, I got a lot of "error LNK2001" and "error LNK2019" D'Oh! | :doh:

Very peculiar, the Dll project didn't import any libs !?

Hans Dietrich17-Apr-11 1:35

17-Apr-11 1:35

Post errors here if you need help.

Best wishes,
Hans

refla17-Apr-11 2:09

17-Apr-11 2:09

error LNK2019: unresolved external symbol "public: void __thiscall CHdtaVwRenderThread::AddJobW(int,int,class CSize const &,struct CHdtaVwDisplaySettings const &,int)" (?AddJobW@CHdtaVwRenderThread@@QAEXHHABVCSize@@ABUCHdtaVwDisplaySettings@@H@Z)，the symbol called in function "protected: void __thiscall CHdtaVwBaseView::UpdatePageCache(int,class CRect const &,bool)" (?UpdatePageCache@CHdtaVwBaseView@@IAEXHABVCRect@@_N@Z)

error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall PageInfo::~PageInfo(void)" (__imp_??1PageInfo@@QAE@XZ) dtaVwBaseView.obj

Best Regard.

Hans Dietrich17-Apr-11 2:30

17-Apr-11 2:30

OK, none of these are MFC or Windows APIs. You're going to need to track down where CHdtaVwRenderThread, CHdtaVwBaseView, and PageInfo are located. Look at the .dsp (or .vcproj) file of the DLL (open in regular text editor). Search for these names, or for 'hdta'. The DLL must be linking with these APIs somehow. Also, search your HD for 'hdta*'. If you're able to compile and build the DLL on your system, they must be there someplace. In particular, look at any include directories or lib directories that the DLL links to.

Best wishes,
Hans

refla18-Apr-11 10:44

Build Error - Creating a DirectSound secondary buffer [modified]

18-Apr-11 10:44

HI, Hans

I have solved the problem after I erased the word "AFX_EXT_CLASS" before CHdtaVwRenderThread!

Thank you for your help again.

Best wishes.

Paul Hasler15-Apr-11 4:44

Paul Hasler

15-Apr-11 4:44

The following code results in a Build Error error LNK2001: unresolved external symbol _IID_IDirectSoundBuffer8 if I un-comment the 5th line:
hr = pDirectSoundBuffer->QueryInterface(IID_IDirectSoundBuffer8, (LPVOID*) ppDirectSoundBufferInterface);

I've added Dsound.lib to the Additional Dependencies for the Linker in this project.
I've included Dsound.h which has the definition of IID_IDirectSoundBuffer8 in my .cpp file, so it should know all about the GUID Definition. Confused | :confused:

Why has it pre-pended an underscore in the Build Error message (i.e. "_IID_IDirectSoundBuffer8")? I don't have one in my code. I used "IID_IDirectSoundBuffer8".

// Create the buffer
hr = lpDirectSound->CreateSoundBuffer(&dsbDescription, &pDirectSoundBuffer, NULL);
if(SUCCEEDED(hr))
{
    //hr = pDirectSoundBuffer->QueryInterface(IID_IDirectSoundBuffer8, (LPVOID*) ppDirectSoundBufferInterface);
    pDirectSoundBuffer->Release();
}

With the offending line commented out as above, the code builds ok and runs. Putting in a break-point and investigating the various values just prior to the offending line I have the following:

hr = S_OK ......So it apparently created the Secondary Buffer Ok

pDirectSoundBuffer.IUnknown.__vfptr[0] = 0x73f5d348
pDirectSoundBuffer.IUnknown.__vfptr[1] = 0x73f38f8c
pDirectSoundBuffer.IUnknown.__vfptr[2] = 0x73f19105

dsbDescription.dwSize = 36
dsbDescription.Flags = 32960 (i.e. DSBCAPS_CTRLPAN | DSBCAPS_CTRLVOLUME | DSBCAPS_GLOBALFOCUS)
dsbDescription.dwBufferBytes = 5930
dsbDescription.dwReserved = 0
dsbDescription.lpwfxFormat.wFormatTag = 1
dsbDescription.lpwfxFormat.nChannels = 1
dsbDescription.lpwfxFormat.nSamplesPerSec = 11025
dsbDescription.lpwfxFormat.nAvgBytesPerSec = 11025
dsbDescription.lpwfxFormat.nBlockAlign = 1
dsbDescription.lpwfxFormat.wBitsPerSample = 8
dsbDescription.lpwfxFormat.cbSize = 0
dsbDescription.guid3DAlgorithm = {GUID_NULL}

All values in dsbDescription correlate with what we should see for the selected Wave file.

The QueryInterface method is supposed to retrieve a pointer to the interface for my object.
i.e. it's supposed to fill the pointer ppDirectSoundBufferInterface with the correct pointer address for the DirectSound Buffer Interface of my new DirectSoundBuffer object.

Any clues at to why this Build Error occurs would be most appreciated.

Thank you in advance

Paul.

modified on Friday, April 15, 2011 11:25 AM

Re: Build Error - Creating a DirectSound secondary buffer

Richard MacCutchan15-Apr-11 5:06

Richard MacCutchan

15-Apr-11 5:06

Take a look at the header file dsound.h and check that it is defining the correct version thus:

#define DIRECTSOUND_VERSION 0x0800  /* Version 8.0 */

d@nish[^] has the answer.

Re: Build Error - Creating a DirectSound secondary buffer

Paul Hasler15-Apr-11 5:19

Paul Hasler

15-Apr-11 5:19

Thanks for your response Richard.

Below is the definiton in Dsound.h
I'm running XP PRO SP3 on this old laptop so it will be defining DirectSound Version 9.0
My understanding was that this was still based on the DirectSound8 interfaces etc.
Have I miss-understood? I'm only just starting to learn DirectSound, so that's highly likely. Sigh | :sigh:

#ifndef DIRECTSOUND_VERSION

#if (NTDDI_VERSION < NTDDI_WINXP) /* Windows 2000 */
#define DIRECTSOUND_VERSION 0x0700  /* Version 7.0 */
#elif (NTDDI_VERSION < NTDDI_WINXPSP2 || NTDDI_VERSION == NTDDI_WS03) /* Windows XP and SP1, or Windows Server 2003 */
#define DIRECTSOUND_VERSION 0x0800  /* Version 8.0 */
#else /* Windows XP SP2 and higher, Windows Server 2003 SP1 and higher, Longhorn, or higher */
#define DIRECTSOUND_VERSION 0x0900  /* Version 9.0 */
#endif

#endif // DIRECTSOUND_VERSION

Re: Build Error - Creating a DirectSound secondary buffer

Richard MacCutchan15-Apr-11 6:01

Richard MacCutchan

15-Apr-11 6:01

Well you need to see which one of these is actually enabled to check whether it's generating for 7, 8 or 9. If you open this in Visual Studio you should see two of them grayed out and one in normal definition which is the value being used by the compiler. I just checked on my system (Windows 7) and it uses 0x0800 which should build correctly.

d@nish[^] has the answer.

Re: Build Error - Creating a DirectSound secondary buffer

Paul Hasler15-Apr-11 6:48

Paul Hasler

15-Apr-11 6:48

Yes it's using DirectSound Version 9. The other's are grayed out.
However it's still my understanding that there is no IID_IDirectSoundBuffer9 etc. It's all still based on DirectSound8. Is this not the case?

The following line in Dsound.h is not grayed:

DEFINE_GUID(IID_IDirectSoundBuffer8, 0x6825a449, 0x7524, 0x4d82, 0x92, 0x0f, 0x50, 0xe3, 0x6a, 0xb3, 0xab, 0x1e);

I'm still also confused why the Build Error talks about _IID_IDirectSoundBuffer8 when neither I or my dog ever mentioned anything starting with an underscore. Confused | :confused:

Currently trying to modify the nearest large vertical surface by craniofacial means.

Thanks again for your responses. Your input is really appreciated.

Re: Build Error - Creating a DirectSound secondary buffer

Richard MacCutchan15-Apr-11 7:26

Richard MacCutchan

15-Apr-11 7:26

The leading underscore is put there by the compiler and the actual value should be found in the Dsound3d.lib file. If you do not have that (and its corresponding DLL) on your system then you need to get a copy of Directx8 libraries; some more info here[^].

d@nish[^] has the answer.

Multiple selection in CListCtrl??

Arrin15-Apr-11 0:29

Arrin

15-Apr-11 0:29

Hello,
i need to copy multiple selection to clipboard from my CListCtrl.
Now is that ctrl+c copy only the first selected item from my CListCtrl, but not the rest!

How to catch ctrl+c key's???

thanks for any help!
Arrin!

Re: Multiple selection in CListCtrl??

Hans Dietrich15-Apr-11 5:13

15-Apr-11 5:13

You can derive your own CMyListCtrl from CListCtrl and handle the WM_KEYDOWN or WM_CHAR messages. Then loop over the selected rows and accumulate them in a CString variable, appending CR/LF to each row (maybe also putting a TAB between columns). Finally, copy the CString variable to the clipboard.

Best wishes,
Hans