C / C++ / MFC

Re: Problem in Setting LayoutRTL using CWnd::PreCreateWindow

9-Jan-09 0:10

I think you need to see Multiple language support for MFC applications with extension DLL[^].

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Combo Box problems

trioum8-Jan-09 22:43

trioum

8-Jan-09 22:43

I am working on this little VC++ 6.0 simple dialog-based application.
No matter whatever I change about the styles etc I only get a combobox
that at launch being clicked shows a drop down cell (one cell) that shows one item with a spin
control on the right corner instead of a full list of items. Of course I can use
the spin control to go through all the items, but it's kind of annoying when
I can simply pick easily from a drop list that shows everything at one time.
how can I solve that problem

Trioum

Re: Combo Box problems

Cedric Moonen8-Jan-09 22:49

Cedric Moonen

8-Jan-09 22:49

Open the resource editor and click on the arrow of the control. You'll be able to modify the size of the drop region instead of the size of the control.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

[Message Deleted]

Alex@9C8-Jan-09 21:44

Alex@9C

8-Jan-09 21:44

[Message Deleted]

Stuart Dootson8-Jan-09 21:53

Stuart Dootson

8-Jan-09 21:53

What's the difference between what you are expecting to see and what you are actually seeing?

toxcct8-Jan-09 23:46

8-Jan-09 23:46

why did you delete your question without answering the reply you got ?! D'Oh! | :doh:

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Hamid_RT9-Jan-09 0:21

9-Jan-09 0:21

Thanks for delete your question.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

toxcct9-Jan-09 1:10

9-Jan-09 1:10

Hamid. wrote:
Thanks for delete your question

what was it about ?! Confused | :confused:

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Hamid_RT9-Jan-09 1:22

9-Jan-09 1:22

I could said where's your question or why did you delete your question
but I said thanks,it was equivocal(thanks doesnt have real mean here Wink | ;)

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

toxcct9-Jan-09 1:24

9-Jan-09 1:24

oh, that was rethorical... I thought you knew much than me Smile | :)

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Hamid_RT9-Jan-09 1:35

9-Jan-09 1:35

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Stuart Dootson9-Jan-09 1:24

Stuart Dootson

9-Jan-09 1:24

The OP was setting WS_EX_LAYOUT_RTL on a (to be created) window in PreCreateWindow, but he had some (unstated) issue with it - which is why I asked him to describe what he was expecting vs what he saw.

Hamid_RT9-Jan-09 1:35

How to get/put(VARIANT newVal) ??

9-Jan-09 1:35

Thanks for your reply.
Smile | :)

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

komofilms8-Jan-09 21:30

komofilms

8-Jan-09 21:30

Hello guys!

Im new in C++ programing, and I want to
get and put same data in my COM.
I dont have problems with basic data types.

My IDL:

[propget, id(FW_DISPID_OFFSET), helpstring("property Offset")] HRESULT Offset([out, retval] short *pVal);
[propput, id(FW_DISPID_OFFSET), helpstring("property Offset")] HRESULT Offset([in] short newVal);

My Cpp:

STDMETHODIMP CYslider::get_Offset(short *pVal)
{
*pVal = m_Offset;
return S_OK;
}

STDMETHODIMP CYslider::put_Offset(short newVal)
{
m_Offset = newVal;
SetDirty(TRUE);
FireViewChange();
return S_OK;
}

So far so good Smile | :)

, but now I dont know how to deal with arrays,
I googled a lot and I have found that solution is with VARIANT and safearray
but I dont know how to fill STDMETHODIMP for array.

My IDL:

[propget, id(FW_DISPID_ARRAYTEST), helpstring("property ArrayTest")] HRESULT ArrayTest([out, retval] VARIANT *pVal);
[propput, id(FW_DISPID_ARRAYTEST), helpstring("property ArrayTest")] HRESULT ArrayTest([in] VARIANT newVal);

My Cpp:

STDMETHODIMP CYslider::get_ArrayTest(VARIANT *pVal)
{
????????????????????????????????
return S_OK;
}

STDMETHODIMP CYslider::put_ArrayTest(VARIANT newVal)
{
????????????????????????????????
return S_OK;
}

I will be very happy if somebody could help me, with example, advice...

Bye,
Komofilms

Re: How to get/put(VARIANT newVal) ??

Randor 8-Jan-09 22:01

Randor

8-Jan-09 22:01

I haven't worked with COM in quite a few months. The sample code below demonstrates everything you need to know based on your inquiry/statements.

STDMETHODIMP CYslider::get_ArrayTest(VARIANT v)
{
	SAFEARRAY *pArrayVal = v.parray;
	char HUGEP *pArray = NULL;
	HRESULT hr = SafeArrayAccessData(pArrayVal,(void HUGEP * FAR *)&pArray );
	//Your array Length is: pArrayVal->rgsabound[0].cElements
	//Pointer to first element in your array is:pArray
	SafeArrayUnaccessData(pArrayVal);
	return S_OK;
}

HRESULT CYslider::put_ArrayTest(BYTE* data, LONG iLen)
{
	VARIANT v;
	SAFEARRAY *pArrayVal = NULL;
	SAFEARRAYBOUND arrayBound;
	CHAR HUGEP *pArray = NULL;
	arrayBound.lLbound = 0;
	arrayBound.cElements = iLen;

	pArrayVal = SafeArrayCreate(VT_UI1, 1, &arrayBound);

	if (NULL != pArrayVal)
	{
		HRESULT hr = SafeArrayAccessData(pArrayVal,(void HUGEP * FAR *)&pArray);

		if (SUCCEEDED(hr))
		{
			memcpy(pArray, data, arrayBound.cElements);
			V_VT(&v) = VT_ARRAY | VT_UI1;
			V_ARRAY(&v) = pArrayVal;
		}
		else
		{
			if (NULL != pArrayVal)
			{
				SafeArrayDestroy(pArrayVal);
				return S_FALSE;
			}
		}
		//You can do whatever with your array here
		//Here I am just sending it back to the get function.
		hr = SUCCEEDED(get_ArrayTest(&v));
		SafeArrayUnaccessData(pArrayVal);
	}
	VariantClear(&v);
	return S_OK;
}

Hopefully its enough to get you started. You can tweak it so it works with your application. If you have any questions feel free to ask.

Best Wishes,
-David Delaune

Re: How to get/put(VARIANT newVal) ??

Stuart Dootson8-Jan-09 22:11

Stuart Dootson

8-Jan-09 22:11

Here's an example of creating a SAFEARRAY of doubles and returning it through an output parameter (as you have in your get_ArrayTest method):

SAFEARRAYBOUND saBound[2] = { {10, 0}, {5, 0} };
pSA = ::SafeArrayCreate(VT_R8, 2, saBound);

for(int i=0;i<10;++i)
   {
   for(int j=0;j<5;++j)
   {
      static long indices[2];
      indices[0] = i;
      indices[1] = j;
      double value = i *5 + j;
      ::SafeArrayPutElement(pSA, indices, (void*)&value);
   }
}

pVal->vt = VT_ARRAY|VT_R8;
V_ARRAY(pVal) = pSA;

Accessing a SAFEARRAY is similar - you use SafeArrayGetElement rather than SafeArrayPutElement and don't need to create or destroy the array.

The vt member of the VARIANT holding the array should define the type of the array as shown, with a VT_type defining the element type, ORed with VT_ARRAY. SafeArrayGetVartype interrogates the SAFEARRAY to get the element type directly.

HTH!!!

Re: How to get/put(VARIANT newVal) ??

komofilms14-Jan-09 1:28

komofilms

14-Jan-09 1:28

I made it this way....

STDMETHODIMP CYslider::put_VrednostArray(VARIANT newVal)
{
if (!(newVal.vt & VT_ARRAY)) return S_OK;

if (newVal.parray == NULL) return S_OK;
VARTYPE vt = newVal.vt & VT_TYPEMASK;
SAFEARRAY* psaSafeArray = newVal.parray;

SafeArrayLock(psaSafeArray);

long j;
long LBound, HBound;
unsigned long elementsToWrite;
int writeBufferCn;

LBound = psaSafeArray->rgsabound[0].lLbound;
//write minimum of: TotElements, array size
elementsToWrite = m_TotElements;
if (elementsToWrite > 10) { //psaSafeArray->rgsabound[0].cElements) {
elementsToWrite = psaSafeArray->rgsabound[0].cElements;
}
HBound = LBound + elementsToWrite;

VARIANT varValToWriteTableElement;
V_VT(&varValToWriteTableElement) = vt;

writeBufferCn =0;

for(j = LBound; j < HBound; j++)
{
switch( vt )
{
case VT_R4:
SafeArrayGetElement(psaSafeArray, &j, &V_R4(&varValToWriteTableElement));

m_VrednostArray[writeBufferCn++] =(varValToWriteTableElement.fltVal);

break;
default:
break;
}

}

SafeArrayUnlock(psaSafeArray);

FireViewChange();
return S_OK;
}

It Works Smile | :)

Thanks all for help!

How to inverse a variable in bit level?

Joseph Marzbani8-Jan-09 21:14

Joseph Marzbani

8-Jan-09 21:14

Suppose I've got a variable of type BYTE. It looks something like 10001011 in the memory. Now I want to inverse it so that I get 11010001.

Thank you masters!

Randor 8-Jan-09 21:42

Randor

8-Jan-09 21:42

BYTE b = 139;
b = ((b * 0x0802LU & 0x22110LU) | (b * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16;

Credit for the discovery of this little neat trick goes to Sean Anderson at stanford university.

Best Wishes,
-David Delaune

Cedric Moonen8-Jan-09 21:58

Cedric Moonen

8-Jan-09 21:58

Ok, now explain it Poke tongue | ;-P

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Randor 8-Jan-09 23:05

Randor

8-Jan-09 23:05

It works by masking bits/using the AND operator to get the bits in the proper location. It is very beautiful, you can see it working here:

DWORD iTmp =0;
BYTE b = 139;			// 00000000 00000000 00000000 10001011

DWORD c = (b * 0x0802LU);	// 00000000 00000100 01011001 00010110
c &= 0x22110LU;		// 00000000 00000000 00000001 00010000

DWORD d = (b * 0x8020LU);	// 00000000 01000101 10010001 01100000
d &= 0x88440LU;		// 00000000 00000000 10000000 01000000

iTmp = (c | d);		// 00000000 00000000 10000001 01010000
iTmp = iTmp * 0x10101LU;	// 10000001 11010001 11010001 01010000

iTmp >>= 16;			// 00000000 00000000 10000001 11010001
b = iTmp;			// 00000000 00000000 00000000 11010001

Best Wishes,
-David Delaune

toxcct8-Jan-09 23:49

8-Jan-09 23:49

definitely marvelous... with your accordance, may I quote you in my article which talks about bits twiddling ?

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Randor 8-Jan-09 23:55

Randor

8-Jan-09 23:55

toxcct wrote:
may I quote you

Hi toxcct,

Absolutely. Smile | :)

Best Wishes,
-David Delaune

toxcct9-Jan-09 0:00