GetObjectsForNativeVariants - C / C++ / MFC Discussion Boards

_crs_1-Jul-03 1:38

1-Jul-03 1:38

Hello,
I have a problem ... I want to capture the desktop and save it in a 24Bit bitmap ... my desktop can be 256, 16bit or 32bit color.
How can I do that ? It works fine if the desktop is in 24bit ... but I want to convert a HBITMAP from 256, 16bit, 32bit to 24bit ... I hope I will not have to convert it manualy by saveing it byte by byte .... I hope there is something in windows that can take care of it ... because I saw 15Bit color and God knows many these types can be and I hope I don't have to take care of all... Please if anone can help me... !!! thanks !!!

Re: 24Bit BITMAP

basementman1-Jul-03 5:13

basementman

1-Jul-03 5:13

Check out a class by PJ Naughter called CDibImage. It does conversion to 24bit. Excellent class. http://www.naughter.com/dibimage.html[^]

onwards and upwards...

Re: 24Bit BITMAP

_crs_2-Jul-03 1:46

_crs_

2-Jul-03 1:46

it's cool .... !
thanks .... !!!

Visual Studio file associations

User 66581-Jul-03 1:36

User 6658

1-Jul-03 1:36

Hi
Recently I installed Visual Studio .NET for testing purposes, but kept Visual Studio 6 on my HDD. Now I uninstalled VS .NET and VS6 doesn't handle files like .dsw,.cpp,.h etc anymore. How do I restore the file associations with VC6 again?

regards

modified 12-Sep-18 21:01pm.

Re: Visual Studio file associations

Ryan Binns1-Jul-03 2:13

Ryan Binns

1-Jul-03 2:13

Either reinstall, or set the associations manually. VS6 doesn't include any tools for redoing the associations.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: Visual Studio file associations

User 66581-Jul-03 2:20

User 6658

1-Jul-03 2:20

Ok thanks, seem like it's gonna be a lot of work. Do I lose my VC settings like colors, fonts, include/lib folders etc. if I reinstall?

modified 12-Sep-18 21:01pm.

Re: Visual Studio file associations

Ryan Binns1-Jul-03 2:27

Ryan Binns

1-Jul-03 2:27

Greg S. wrote:
Do I lose my VC settings like colors, fonts, include/lib folders etc. if I reinstall?

Yeah, but you can backup that part of the registry first (just export to a .reg file, and import again after the install)

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

GetObjectsForNativeVariants

vikramlinux1-Jul-03 1:26

vikramlinux

1-Jul-03 1:26

Anybody know how to use the Marshal.GetObjectsForNativeVariants function.I want to transfer the data from Unmanaged Win32 DLL to C# DLL.but the restriction is that I can only use IntPtr as passing param.
Like
Win32 DLL

I created One SafeArray
SAFEARRAY *pSA;
//Some code
pSA = SafeArrayCreate(VT_BSTR...);

SafeArrayPutElement(pSA...,String here );//safearray is full of BSTR Strings

then I called the C# DLL function
pData->ISetIntData((long)pSA);

And in C# DLL

public void ISetIntData(IntPtr Val)
{
Object[] MyObj=Marshal.GetObjectsForNativeVariants(Val,2);
String str=(String)MyObj[0];
MessageBox.Show(str);
//Here It is crashing...
}

Is this a right way Or I am doing some crazy Stuff?

Vikram

Vikram

Problem with serialization.

Svin1-Jul-03 1:13

Svin

1-Jul-03 1:13

I created a class with serialzation support. But then I store class all Ok, but then I try to load class compilation don't pass. Copliler writes:

binary '>>' : no operator defined which takes a right-hand operand of type 'class SnytVolRelOrder *' (or there is no acceptable conversion);

Maybe anyboby knows that's the problem is ?

Sorry for my English.

Re: Problem with serialization.

Nuehli1-Jul-03 1:43

Nuehli

1-Jul-03 1:43

You can't serialize this type. Only following types works:

CObject* | SIZE und CSize |float
----------------------------------------
WORD | CString | POINT und CPoint
DWORD | BYTE | RECT und CRect
double | LONG | CTime und CTimeSpan
int | COleCurrency | COleVariant
COleDateTime | COleDateTimeSpan

You must override Serialize for each class that you intend to serialize. The overridden Serialize must first call the Serialize function of its base class.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_cobject.3a3a.serialize.asp

Re: Problem with serialization.

Svin1-Jul-03 2:20

Svin

1-Jul-03 2:20

I've already done this. The problem is my class normaly loads but then i try to story compliter write an error.

SnytVolRelOrd ord; or SnytVolRelOrd *ord = new SnytVolRelOrd();
CArchive ar(...);
....
ar<<ord; <-----------ok.="" compiler="" passed="" this="" place

ar="">>ord;<------Comiler write an error.

Life is not a programm.

Re: Problem with serialization.

Nuehli1-Jul-03 2:44

Nuehli

1-Jul-03 2:44

I have no idea, which kind of problem it is. But, if I serialize my own classes i call the serialize() Function. Like this in DocClass:

void CEmvDoc::Serialize(CArchive& ar)
{
if (ar.IsStoring())
{ // Save
m_tProjDate=CTime::GetCurrentTime();
ar << m_sProjName << m_tProjDate;
}
else
{ // Load
ar >> m_sProjName >> m_tProjDate;
}
m_oaInterfaces.Serialize(ar);
SetModifiedFlag(false);
}

Re: Problem with serialization.

Svin1-Jul-03 2:56

Svin

1-Jul-03 2:56

May be i didn't say some details. A use CArchive with CSocketFile. I create
two CArchive arIn and arOut(before i create CSocket,CSocketFile ) and if y want to send data to i will write arOut<<..
and the i want to get data i write arIn>>.. and in this place error occures.

Sorry tor my English

How to use multiple #if defined ?

Bjarne Jørgensen1-Jul-03 0:53

Bjarne Jørgensen

1-Jul-03 0:53

Hi
I had a line like this:

<br />
#if defined _CIP || (_STANDALONE && (_KA || _UDV)) || _OTN9<br />
        <include something><br />
#endif<br />

One of these defines are no longer needed so I changed it into:

<br />
#if defined (_STANDALONE && (_KA || _UDV)) || _OTN9<br />
        <include something><br />
#endif<br />

But this gives a warning / error

aaa.cpp(288) : warning C4004: incorrect construction after 'defined'
aaa.cpp(288) : fatal error C1012: unmatched parenthesis : missing '('

But I'm beginning to suspect it should have been

<br />
#if (defined _STANDALONE && (defined _KA || defined _UDV)) || defined _OTN9<br />

instead

This gives no compiler warnings / errors

What I want is to include some lines if one of the following combination are true
_STANDALONE && _KA
_STANDALONE && _UDV
_OTN9

Would this changes how things would be handled in the preprocessor stage ?

Remark:
I don't use #define to define these, but using "preproccesor settings" under "project settings" , that is the /D switch

Using VC6

Re: How to use multiple #if defined ?

Ryan Binns1-Jul-03 2:19

Ryan Binns

1-Jul-03 2:19

to_be_unknown wrote:
#if (defined _STANDALONE && (defined _KA || defined _UDV)) || defined _OTN9

This is the correct syntax, and will work as you require. The original syntax that you used would work, but only if the defines had the value 0 or 1, or if they were not defined (the preprocessor assumes a definition to have the value 0 if it is not defined). If they had any other value, it would not work correctly.

The reason you were getting compiler errors was because the defined operator operates on an identifier, not on an expression.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: How to use multiple #if defined ?

Bjarne Jørgensen1-Jul-03 2:40

Bjarne Jørgensen

1-Jul-03 2:40

Thanks

It would mean I'm going to change alot of like this in my program.

Relying on the preprocessor to assign 0 to not-defined defines could be dangerous. Unless it is specified so in some ANSI/ISO standard ?

Re: How to use multiple #if defined ?

Ryan Binns1-Jul-03 3:25

Ryan Binns

1-Jul-03 3:25

to_be_unknown wrote:
Relying on the preprocessor to assign 0 to not-defined defines could be dangerous.

Absolutely. I'm not sure if it's in the standard or not.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

combo box problem

si_691-Jul-03 0:49

si_69

1-Jul-03 0:49

Hi

im having problems retreiving the values held in my combo box
the combobox holds a list of strings

i have

CComboBox* pLB = (CComboBox*) GetDlgItem(IDC_CNOCALLS);
int nIndex = pLB->GetCurSel();
DWORD n = pLB->GetItemData( nIndex);

however im getting a error on DWORD, and its not giving me the value in the combo box
can ne1 help

thanks

simon

Re: combo box problem

User 66581-Jul-03 1:26

User 6658

1-Jul-03 1:26

If you want the value of a specific item you need the GetText()-function. Try this:

<br />
CString strText;<br />
pLB->GetText(nIndex, strText);<br />

strText will then hold the value of the item at position nIndex. If you need an interger (if your combobox holds numbers() just do int number = atoi(strText);.

regards

modified 12-Sep-18 21:01pm.

Re: combo box problem

vikramlinux1-Jul-03 1:47

vikramlinux

1-Jul-03 1:47

Try to Use
GetLBTextLen
GetLBText

GetItemData is a different function..check out MSDN.

Problem with printing of bitmap pattern with CBrush

Muhammad Kamran1-Jul-03 0:48

Muhammad Kamran

1-Jul-03 0:48

Hi..All
i am using a Bitmap in a CBrush to display the pattern in a rectangular box at many places in the drawing of my vc++ application..
the problem is that on certain plotters the pattern is not displayed at all
although it is coming and very good in normal view and print preview.

and on some plotters it just display the crosses all over the rectangle.

and some time the pattern is displayed but it is so close that whole rectangle color becomes black...

Does any body have any idea why...

That would be very nice of him.
Thanks

Muhammad Kamran
Sofware Engineer.

Re: Problem with printing of bitmap pattern with CBrush

basementman1-Jul-03 5:24

basementman

1-Jul-03 5:24

Some vector based devices do not support that kind of drawing. Try calling GetDeviceCaps(DT_PLOTTER) when in print mode, and if it is true, don't draw using the brush. Typically, vector devices don't support the more advanced printing, like raster devices.

onwards and upwards...

Deleting Files.

Saty1-Jul-03 0:23

Saty

1-Jul-03 0:23

Hi,

I am planning to develop a tool. It needs to work on a folder of size 2 GB. First it needs to remove the read only attribute for all the files in the folder. Then a third party tool will do some more processing and then my tools needs to delete all the files. This tools needs to work on Win2K. Presently i am using attrib and del dos commands. it takes hell lot of time to dothis task. I would like to develop something at the NTFS level to do this. Any pointers, samples will be of alot of help.

Regards,
Cutti

Re: Deleting Files.

Ravi Bhavnani1-Jul-03 3:20

Ravi Bhavnani

1-Jul-03 3:20

Unless I've misunderstood, couldn't you just use the Win32 API or MFC to change file attributes and delete files? CFile provides methods GetStatus(), SetStatus() and Remove() that may fit the bill.

/ravi

Let's put "civil" back in "civilization"
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ravib@ravib.com

Re: Deleting Files.

basementman1-Jul-03 5:35

basementman

1-Jul-03 5:35

Yes, something like:

void SetFilesToNotReadonly(LPCSTR cpFileDir)
{
  CString cFileName;
  WIN32_FIND_DATA sFD;

  CString cFileSpec = CString(cpFileDir) + CString("*.*");

  HANDLE hFind = FindFirstFile((LPCSTR)cFileSpec,&sFD);
  if (hFind != INVALID_HANDLE_VALUE)
    {
      if (!(sFD.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
        {
          cFileName = CString(cpFileDir) + sFD.cFileName;
          SetFileAttributes(cFileName, sFF.dwFileAttributes & (~FILE_ATTRIBUTE_READONLY));
        }

      while (FindNextFile(hFind,&sFD))
        {
          if (!(sFD.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
            {
              cFileName = CString(cpFileDir) + sFD.cFileName;
              SetFileAttributes(cFileName, sFF.dwFileAttributes & (~FILE_ATTRIBUTE_READONLY));
            }
        }

      FindClose(hFind);
    }
}

onwards and upwards...

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