how to control opengl buffer content - C / C++ / MFC Discussion Boards

Re: finding remote host up or not ! How ?

ThatsAlok26-Dec-06 18:56

ThatsAlok

26-Dec-06 18:56

Sakthiu wrote:
I need to find frequently that whether remote host is on or off.

try to connect to the remote host and look for returned Header!, i.e. if it is Websever it will return some webpage, header etc

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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File sie in win32

amitmistry_petlad 26-Dec-06 17:37

amitmistry_petlad

26-Dec-06 17:37

is any body has the code or function or link for calculate the size of file
from WIN32_FILE_ATTRIBUTE_DATA structure of WIN32.
i have found some solution but i dont know how to implement it.
e.g.
http://www.tutorials-blog.com/win32/WINFINDDATAnFileSize/

amit

Re: File sie in win32

_AnsHUMAN_ 26-Dec-06 18:05

_AnsHUMAN_

26-Dec-06 18:05

amitmistry_petlad wrote:
Re: File sie in win32

WIN32_FIND_DATA wfd;
HANDLE hFile = FindFirstFile("C:\\MyFile.txt",&wfd);
int fileSize=0;   // Preferrably do not take an int. I use it for simplicity
fileSize=(wfd.nFileSizeHigh*(MAXDWORD+1))+wfd.nFileSizeLow;

// fileSize contains the size of the file in bytes.
I haven't tested the code, so it may have some limitations
I hope this helps you...

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: File sie in win32

Michael Dunn26-Dec-06 20:41

Michael Dunn

26-Dec-06 20:41

A file size is a 64-bit unsigned integer, so your calculation for fileSize will overflow if nFileSizeHigh > 0.

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

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Re: File sie in win32

Hamid_RT26-Dec-06 18:23

Hamid_RT

26-Dec-06 18:23

Try this

WIN32_FILE_ATTRIBUTE_DATA m_lpFindData;

GetFileAttributesEx("C:\\123.pdf",GetFileExInfoStandard,&m_lpFindData);
DWORD dwSize =(m_lpFindData.nFileSizeHigh*(MAXDWORD+1)) +m_lpFindData.nFileSizeLow;
</code>

WhiteSky

Re: File sie in win32

Mark Salsbery27-Dec-06 5:41

Mark Salsbery

27-Dec-06 5:41

Borrowing from WhiteSky's response, but without overflow Smile | :)

...

WIN32_FILE_ATTRIBUTE_DATA m_lpFindData;
GetFileAttributesEx(_T("C:\\123.pdf"),GetFileExInfoStandard,&m_lpFindData);
DWORD64 qwSize = ((DWORD64)m_lpFindData.nFileSizeHigh << 32) + m_lpFindData.nFileSizeLow;

std linker errors

Nougat H.26-Dec-06 12:25

Nougat H.

26-Dec-06 12:25

Hello, I have downloaded this LLMozLib (it allows easy embedding of the Mozilla Gecko HTML layout engine)
but when I tried to compile one of the test apps I got these linker errors:

llmozlib.lib(llmozlib.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::_String_base::_Xran(void)const " (?_Xran@_String_base@std@@QBEXXZ)<br />
llmozlib.lib(llembeddedbrowser.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::_String_base::_Xran(void)const " (?_Xran@_String_base@std@@QBEXXZ)<br />
llmozlib.lib(llembeddedbrowserwindow.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::_String_base::_Xran(void)const " (?_Xran@_String_base@std@@QBEXXZ)<br />
llmozlib.lib(llmozlib.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::_String_base::_Xlen(void)const " (?_Xlen@_String_base@std@@QBEXXZ)<br />
llmozlib.lib(llembeddedbrowser.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::_String_base::_Xlen(void)const " (?_Xlen@_String_base@std@@QBEXXZ)<br />
llmozlib.lib(llembeddedbrowserwindow.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::_String_base::_Xlen(void)const " (?_Xlen@_String_base@std@@QBEXXZ)<br />
llmozlib.lib(llmozlib.obj) : error LNK2001: unresolved external symbol "public: void __thiscall std::ios_base::_Addstd(void)" (?_Addstd@ios_base@std@@QAEXXZ)

The _String_base is defined in the following way:

class _CRTIMP2_PURE _String_base
		: public _Container_base
	{	// ultimate base class for basic_string to hold error reporters
public:
	_MRTIMP2_NPURE_NCEEPURE static void __CLRCALL_PURE_OR_CDECL _Xlen();	// report a length_error
	****

Now I found this thread that shows the identical problem and it is suggested that the calling conventions
of the definition and the lib don't match, but the solution (to change __CLRCALL_PURE_OR_CDECL to __cdecl) doesn't work.

I have tried everything to resolve them, but it's no good (god, how I hate linker errors).
I hope one of you guys can shed some light on this.

Thank you.

#edit-> Oh, and I'm using vs8.

how to control opengl buffer content

patrickH8026-Dec-06 10:49

patrickH80

26-Dec-06 10:49

hello,

the aim of my program is to move a 50x50 pixel (pic_a) immage over a 500x500 pixel (pic_b) image by moving the mouse over the big image.
also, i have to copy a part of pic_b to produce pic_a and change to rgb color into a grayscale for pic_a. In the end the grayscaled pic_a
has to move over pic_b while exactly matching in content. i know it is hard to explain but i just hope that anybody can give me an idea how to
make a copy, save this and put it into the front. i am using c++ and opengl and think i need several buffers and switch them while moving???

thanks in advance,
patrick

Directshow question

godspeed12326-Dec-06 8:50

godspeed123

26-Dec-06 8:50

Hi,

I am new at directshow, I am coding in Visual C++ .NET but with MFC. I need to take images which are being stored in memory on the fly and put them into a movie file. The images are being streamed into memory and their is no source filter that allows me to take DIB's stored in memory and put into directshow, unless I missed something.

Do I have to write a source filter that takes images from memory and put it into the directshow pipeline? I am a little lost here, if anyone knows how this can be done it would be greatly appreciated. Also some sample code of doing this would be greatly appreciated.

Thanks