C / C++ / MFC

Video Control, some help heeded

5-Jul-06 12:39

It may also be the case that the process is stuck in kernel space, waiting for some object to become signalled? It wouldn't be the first (nor the last) time winamp hung. Does TerminateProcess() return FALSE, and if so, what does GetLastError() return?

--
Not Y3K Compliant

hell_admin5-Jul-06 10:19

hell_admin

5-Jul-06 10:19

I need to develop some control looking like this

please help with some ideas,
i think the best way is to derive a class frow CWnd and inside it make some CStatic controls wich will display images using GDI+, but if you have some expirience or know some doc or place to look at, please post it.

P.S.: I'm beginner in MFC

Re: Video Control, some help heeded

Justin Tay5-Jul-06 11:31

Justin Tay

5-Jul-06 11:31

Probably just write a custom control and paint everything yourself. Windows are rather expensive objects and I don't see why you need so many windows to do something as simple as a BitBlt(). None of the windows common controls use GDI+, only GDI.

The only question I think is whether to extract all the thumbnails when the video is loaded and cache it, or generate and cache them on the fly.

Here's an article on creating custom controls.
http://www.codeproject.com/miscctrl/customcontrol.asp[^]

Problems with xml generation

Alex Cutovoi5-Jul-06 9:31

Alex Cutovoi

5-Jul-06 9:31

Hi fellows

I'm developed an app that generates a xml file with some nodes.
it works file, but a little different thing is occuring: the nodes and the filename are saved with chinese(or japanese, I don't know) characters.
I have a function that transforms a string to BSTR. I've verified if the functions works fine and it works, It doesn't convert to chinese os japanese chars. If I define BSTR in the SaveXML function the nodes are saved correctly.
I think that the problem occurs in my conversion to BSTR, but I'm not 100% certainly.
This is the code:

<br />
void myClass::SaveTheXML()<br />
{<br />
       BSTR string; <br />
       BSTR theString, theString2; <br />
       VARIANT theVar, theVar2; <br />
       string = L"teste.xml"; <br />
       theString = L"arquivo"; <br />
       theString2 = L"valor"; <br />
       VariantInit(&theVar); <br />
       VariantInit(&theVar2); <br />
       V_BSTR(&theVar) = SysAllocString(string); <br />
       V_BSTR(&theVar2) = SysAllocString(theString2); <br />
       V_VT(&theVar) = VT_BSTR; <br />
       V_VT(&theVar2) = VT_BSTR; <br />
       parent = CreateXMLElement(sNode1); <br />
       child = CreateXMLElement(sNode2); <br />
       xmlDocument->createElement(L"primeiro", &parent); <br />
       xmlDocument->createElement(L"segundo", &child); <br />
       InsertChildNode(parent, child); <br />
       InsertChildNode(xmlDocument, parent); <br />
       xmlDocument->save(ReturnVariantString(xmlFileName));<br />
}<br />

So, fellows what's going on? Thanks a lot for the support. Below the code that I developed:

<br />
void myClass::InsertChildNode(IXMLDOMNode * parentNode, IXMLDOMNode * childNode) <br />
{ <br />
       IXMLDOMNode * localNode = NULL; <br />
       handleResult = parentNode->appendChild(childNode, &localNode); <br />
       if(localNode == NULL)<br />
       {<br />
              MessageBox(NULL, "Erro na inserção do node", "Erro", MB_OK|MB_ICONERROR);<br />
              return;<br />
       }<br />
} <br />
void myClass::SaveTheXML()<br />
{ <br />
       string sNode1, sNode2, xmlFileName, sAttribName, sAttribValue; <br />
       IXMLDOMAttribute * tempAttribute = NULL; <br />
       sNode1 = "primeiro"; <br />
       sNode2 = "segundo"; <br />
       xmlFileName = "teste.xml"; <br />
       sAttribName = "arquivo"; <br />
       sAttribValue = "valor"; <br />
       parent = CreateXMLElement(sNode1); <br />
       child = CreateXMLElement(sNode2); <br />
       theAttribute = CreateXMLAttribute(sAttribName, sAttribValue);          <br />
       child->setAttributeNode(theAttribute, &tempAttribute); <br />
       InsertChildNode(xmlDocument, theAttribute); <br />
       InsertChildNode(parent, child); <br />
       InsertChildNode(xmlDocument, parent); <br />
       xmlDocument->save(ReturnVariantString(xmlFileName)); <br />
} <br />
<br />
VARIANT myClass::ReturnVariantString(string sNodeName) <br />
{ <br />
       VARIANT variant;<br />
       VariantInit(&variant); <br />
       V_BSTR(&variant) = SysAllocString(StringToBSTR(sNodeName)); <br />
       V_VT(&variant) = VT_BSTR; <br />
       return variant; <br />
}<br />
<br />
IXMLDOMElement * myClass::CreateXMLElement(string sNodeName)<br />
{ <br />
       IXMLDOMElement * xmlElement = NULL; <br />
       BSTR sTemp = StringToBSTR(sNodeName); <br />
       handleResult = xmlDocument->createElement(sTemp, &xmlElement); <br />
       if(xmlElement == NULL)<br />
       {<br />
              MessageBox(NULL, "Erro na criação do node", "Erro", MB_OK|MB_ICONERROR); return NULL;<br />
       } <br />
       return xmlElement;<br />
}<br />
IXMLDOMAttribute * myClass::CreateXMLAttribute(string sAttributeName, string sAttributeValue)<br />
{ <br />
       IXMLDOMAttribute * theAttribute = NULL; <br />
       xmlDocument->createAttribute(StringToBSTR(sAttributeName), &theAttribute); <br />
       handleResult = theAttribute->put_value(ReturnVariantString(sAttributeValue)); <br />
       if(handleResult != S_OK)<br />
       {<br />
              MessageBox(NULL, "Erro na criação do atributo do node", "Erro", MB_OK);return NULL;<br />
       } <br />
       return theAttribute;<br />
}<br />
<br />
BSTR myClass::StringToBSTR(string sValue)<br />
{<br />
       BSTR sTemp = (BSTR)(const char *)sValue.c_str(); <br />
       return sTemp;<br />
}<br />

Re: Problems with xml generation [modified]

Zac Howland5-Jul-06 9:55

Zac Howland

5-Jul-06 9:55

Alex Cutovoi wrote:
BSTR myClass::StringToBSTR(string sValue)
{
BSTR sTemp = (BSTR)(const char *)sValue.c_str();
return sTemp;
}

This will give you interesting results at best. The reason is that BSTRs have to be allocated (you haven't allocated anything in this method). A replacement would be:

_bstr_t myClass::StringToBSTR(const std::string& value)
{
	_bstr_t bstrValue(value.c_str());
	return bstrValue;
}

You can pass _bstr_t's into MSXML's method calls because it overrides the BSTR() operator for you.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

-- modified at 16:36 Wednesday 5th July, 2006

Re: Problems with xml generation

Alex Cutovoi5-Jul-06 10:15

Alex Cutovoi

5-Jul-06 10:15

Two questions Zac:

1)What's the _bstr_t?Is it a private variable that I must to declare?I tried this and doesn't work.
2)I don't understand this: bstrValue(value.c_str()); What is the bstrValue?

Re: Problems with xml generation

Zac Howland5-Jul-06 10:36

Zac Howland

5-Jul-06 10:36

_bstr_t is a helper class that Microsoft wrote. Check here for the documentation.

Line by line, the code I wrote does the following:

// declare a method StringToBSTR that takes a std::string and returns a _bstr_t
_bstr_t myClass::StringToBSTR(const std::string& value)
{
	// declare the return value and initialize it
	// using the constructor that takes a const char*
	_bstr_t bstrValue(value.c_str());
	// return the _bstr_t
	return bstrValue;
}

I believe I forgot the return line in the previous post ... sorry about that.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: Problems with xml generation

Michael Dunn5-Jul-06 11:08

Michael Dunn

5-Jul-06 11:08

You are not creating BSTRs correctly - a BSTR is not simply a pointer to an array like a C-style string is. See my string article[^] - look at the "String in COM" section.
Tom make things easier, you could use a wrapper like _bstr_t or CComBSTR.

--Mike--
Visual C++ MVP Cool | :cool:

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VB > soccer

modeless dialog

Desmo165-Jul-06 6:10

Desmo16

5-Jul-06 6:10

Hi all,

When i use create() to raise a modeless dialog
the compiler tells me i can't use create() with no arguments.
What is the correct way to do that ?

Thanx in advance,
Desmo16.

farshad.f5-Jul-06 6:18

farshad.f

5-Jul-06 6:18

hDlgModeless=CreatDialog(hInstance,szTemplate,hwndParent,DialogProc);

David Crow5-Jul-06 6:26

David Crow

5-Jul-06 6:26

For either of the methods:

BOOL Create( LPCTSTR lpszTemplateName, CWnd* pParentWnd = NULL );
BOOL Create( UINT nIDTemplate, CWnd* pParentWnd = NULL );

You must specify at least a template name or a template id.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Zac Howland5-Jul-06 6:40

Zac Howland

5-Jul-06 6:40

Press F1 ... or go here.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

led mike5-Jul-06 7:04

led mike

5-Jul-06 7:04

Desmo16 wrote:
What is the correct way to do that ?

They hide that information in the DOCUMENTATION

Hamid_RT5-Jul-06 19:28

Hamid_RT

5-Jul-06 19:28

a minimum parameters is id from dialog
Create(IDD_DIALOG);

whitesky

Static unsigned int

Jay035-Jul-06 5:57

Jay03

5-Jul-06 5:57

Hey guys,

I tried searching for static unsigned int on Google but I get a lot of gibberish answers.
It would be greatly appreciated if someone can give me a brief description about it because the document im trying to understand is full of static unsigned integers

Thanks D'Oh! | :doh:

cppcook5-Jul-06 6:07

cppcook

5-Jul-06 6:07

The key here is 'static'. It tells system to allocate memory for the static variable in heap, rather than stack. So the value of the variable can be retrieved globally.

Jörgen Sigvardsson5-Jul-06 8:20

5-Jul-06 8:20

No, static tells the compiler to allocate the memory in the static memory area. new, malloc, etc, allocate from the heap.

--
Presented in doublevision (where drunk)

Justin Tay5-Jul-06 6:08

Justin Tay

5-Jul-06 6:08

Non-gibberish answers from google...

http://www.cprogramming.com/tutorial/statickeyword.html[^]

http://www.rwc.uc.edu/koehler/comath/13.html[^]

toxcct5-Jul-06 6:58

toxcct

5-Jul-06 6:58

ask a more precise question here, and you'll have concise answers...

static is a keyword that have different meaning depending on the place it's used.
unsigned int is a data type, and here again, can have different meaning depending on how it's used

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Jörgen Sigvardsson5-Jul-06 8:20

5-Jul-06 8:20

toxcct wrote:
unsigned int is a data type, and here again, can have different meaning depending on how it's used

Uh, no? unsigned int is always a unsigned int.

--
Coming Soon to an Illegal DVD

super_ttd5-Jul-06 9:56

super_ttd

5-Jul-06 9:56

as i understand it, i think toxcct meant that it could be either used in a variable declaration/definition, type casts, function returns...

but maybe it's just me, and i misunderstood Smile | :)

-- TTD --

Jörgen Sigvardsson5-Jul-06 9:57