Directshow question - C / C++ / MFC Discussion Boards

amitmistry_petlad 26-Dec-06 17:37

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