Compression algorithm question

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- Previous
  - 1
    - External Dependencies was gone! Hi! Where are External Dependencies folder gone in VS.NET 2003? Can I see all included files of my peoject in some other way? Thanks. PS: I think that it was stupid to remove this feature from new version of MSVC. WBR Levan Jgarkava Tag: Compression algorithm question Tag: 212586
  - 2
    - char[] If I have a char[] buffer and I load some data in it by using _read or something similar, and the buffer is bigger than the data, how do I copy only the valid data to another buffer or trim the buffer? Thanks Tag: Compression algorithm question Tag: 212562
  - 3
    - In compilation, is there a way to make something change in the code when I click on "build"? hi, I have a control with a method that must update accordingly to some information written in the .rgs Is there a way to tell VC to update this information just before it compiles? btw, I'm using vc++6.0 sp5. thanks Tag: Compression algorithm question Tag: 212559
  - 4
    - openning up the media player i would like my APP to open up a media file and play it.... if i say START|RUN c:\mymedia.wmv it opens it up and plays but in my app i can't say WinExec(c:\mymedia.wmv....) because nothing happens.... what gives? Tag: Compression algorithm question Tag: 212558
  - 5
    - Why not to save the source file in VC ++ 6.0? Hi, I met trouble when I tried to save some files after revision. One message box popped up and said " Cannot save file,. The file may be in use by another application". Much worse, this file sometimes would be lost when I open this projec next time. It seemed inexplicably disappeared from my folder. Any help is highly appreciated! Jeff Tag: Compression algorithm question Tag: 212555
  - 6
    - Debug Assertion Failed in SolidWorks.exe I try to compile my VC++ 6.0 project (with 4 subprojects and a lot of libs,dll's) in Debug mode. The aim is to create an add-in in SolidWorks. I get the dll and can register is but when I start SolidWorks and try to load my add-in I get the error: Debug Assertion Failed! Program blabla.exe File: afxwin1.inl Line: 22 I have no idea att all what is going on. Any help is highly appreciated. Bob "Yan K. Avlasov" <_yan_avlasov_@_azimuth.net_> wrote in message news:%23QWYCZvUDHA.2152@TK2MSFTNGP09.phx.gbl... > Do you have in your debug configuration any pre or post-build steps what > execute some commands or run some programs? Note the project it compiles > that have this problem and check the properties of this project. > > "bob" <lbortels@vub.ac.be> wrote in message > news:enW06NqUDHA.2156@TK2MSFTNGP11.phx.gbl... > > Hi, > > > > I try to compile my VC++ 6.0 project (with 4 subprojects and a lot of > > libs,dll's) in Debug mode and get 1 error: > > error executing c:\windows\system32\cmd.exe > > In Release mode, there is no problem. > > I work with windows XP Professional > > > > Any help is highly appreciated! > > Bob > > > > > > Tag: Compression algorithm question Tag: 212551
  - 7
    - write CString to file Hello, I've a problem writing a CString to file. I first convert to char* but it does not seem to work. The code is below ... Bob void Test::WriteLog(char* path,CString message) { char* text = new char[1024]; text = (char*)message.GetBuffer(sizeof(text)); FILE* fp = fopen(path,"a"); fprintf(fp,"\n%c",text); fclose(fp); delete text; } Tag: Compression algorithm question Tag: 212545
  - 8
    - Help!! Beep to speaker Hi, How can I play the beep sound to the external speaker through soundcard instead of the internal speaker? Any help is welcome. -- Regards, Chun Hui Programmer KML Engineering Limited [www.kml.com.hk] Tel: 852-2929-5658 Fax: 852-2635-6181 chui@kml.com.hk ____________________________________________________________________________ __ DISCLAIMER:- This e-mail is intended for the addressee(s) only. It is privileged and may also be confidential. Any review, retransmission, or other use of this information by persons other than the addressee is prohibited. If you are not the intended recipient, please notify the sender immediately and delete the material from all your computer. ____________________________________________________________________________ __ Tag: Compression algorithm question Tag: 212542
  - 9
    - Inline ASM and OOP Hello, I wrote a pretty nice D3D framework in C++. Everything is done in classes and it all works great. Now I want to make a special version of it that is as small as possible. But I want to keep all the classes and basically maintain full compatibility with the "full" system. Some features will of course be left out, but otherwise I shouldn't have to change any code in the applications using the system. >From the beginning I already had this in my head so I can comment almost every feature out with a lot of #defines. And it gets a lot smaller. But now I want to push it to the limit using ASM. I figured I can decrease the total code size by at least a couple of k's when applying all my nasty tricks :) Anyway, I just got started and already ran into the first 2 problems: 1) I'm using VC6 and apparently imports aren't handled automatically when an API function is only called from an ASM block. Manually importing all functions seems a bit unnecessary so anyone knows of a better solution? 2) OOP. I know how to access data members of an object, but can't figure out how to call member functions. It seems MS's compiler wastes a lot of bytes for every "Object *bla = new Object()" so I'd really like to have that in ASM. But I have no clue how to call the constructor of the object. A sidenote.. Code readability is not really an issue here. My framework is in a stable state right now, and this small version is going to be for hacky 64k versions. This version of the framework will exist purely to get it as small as possible. Every dword counts :) I googled for quite a while now without getting any usable results. Hope someone here can help me :) /Nico Tag: Compression algorithm question Tag: 212541
  - 10
    - Why not to save the file in VC++ 6.0 IDE Hi After edited some source files(.cpp or .h) in VC++ 6.0 IDE, I wanted to save it. However, sometimes there popped up a message box and told " Cannot save file. The file may be in use another application". Much worse, I might lose this file when I open project next time. And it also inexplicably disappeared from my folder. Thanks for any help in advance! Jeff Tag: Compression algorithm question Tag: 212538
  - 11
    - randomize() I am trying to run a code which gives the following compilation error error C2065: 'randomize' : undeclared identifier error C2065: 'random' : undeclared identifier Error executing cl.exe. i am using Visual studio 6.0, Is there something that i am supposed to include for this. i have already inculded the following for diff reasons. #include <stdio.h> #include <iostream> #include <math.h> #include <string.h> #include <conio.h> #include <process.h> #include <stdlib.h> Can anyone help me in identifying the problem Regards Ritu Tag: Compression algorithm question Tag: 212533
  - 12
    - winsock revc / send i am trying to connect to a http with winsock, i have successfully connect to a server with connect, but if i want to receive back the server response, what function i should use ? i have been tried to using char *a="GET /a/ a HTTP/1.0"; ................. ............... send(s, strsend, strlen(strsend),0); ............. ....... if i want to receive back the bytes or stream that replied from the server, which is expected like HTTP/1.0 xxx Server: xxxxxxxxxxxxx ..................... how can i achevie that ? using buffer or which function to store the data received ? thank ^_^ ! Tag: Compression algorithm question Tag: 212531
  - 13
    - Template Member Function Parameters I have some code from an open source project I'm trying to port to VC6 SP5 I'm having trouble passing a parameter to a template member function. I'm not new to templates, but this one goes a bit deeper then I've ever delved. Here's the watered down version: Two simple classes, one inherits from the other, and the template class. ======== class test { public: test(); }; class test2 :: public test { public: test2(); }; template <class P> class MPtr { public: MPtr(); ~MPtr(); template <class Q> friend bool myFunc(const MPtr& p) { return 0; } }; ===== Now, when I do: ===== MPtr<test2> a; is_a<test>(a) ====== VC++ gives the error: error C2670: 'is_a' : the template function cannot convert parameter 1 from type 'class MPtr<class test2>' Any ideas? I know this compiles with gcc, because that's what this code is from. I'm sure this is come VC specific problem, and if so, is there a workaround? Thanks. Marc Tag: Compression algorithm question Tag: 212526
  - 14
    - open xll without excel Hi, Is there anyone know how to open xll without excel? I have a c++ program that need to access a function inside an xll, it produce an error "xlcall32.dll not found" when I call LoadLibrary(). It seems that the xll need to link to xlcall32.dll to solve some symbols. Is it possible that I create my own xlcall32.dll that provide those symbols? If yes, which symbols should I produce? Thank you very much for any help! Leo Tag: Compression algorithm question Tag: 212523
  - 15
    - can't see debug information after program crash on XP I'm running my code in VC++ 6.0 on WinXP under debug mode. Every time it meets memory error, e.g. access violation, a messagebox popup, then I choose "debug", another messagebox popup saying some address can't be read. After click on the "ok" button, every active window will be shut down and I can't see which line of code cause the problem. In other platform than XP, the debugger will stop at the line cause the problem. What's wrong with XP? Any suggestion? Thanks. Tag: Compression algorithm question Tag: 212519
  - 16
    - Porting ARM version to Xscale Hi all, I need to port an ARM version or a little app to Xscale, but cannot find any "how-to(s)" or anything about it. I also search for an Xscale SDK but no luck yet. What do I need to do to port it to Xscale ? I'm using eVC++ 3.0. Thank you. Jano Tag: Compression algorithm question Tag: 212512
  - 17
    - Visual C++ 6 non-inline member function in template'd class I have the following class: template<class DynObject, class ElementType = int> class SmartPtr int operator== (const SmartPtr & _dynObject); }; With the following externally defined member function (i.e. non-inline): template<class DynObject, class ElementType> int SmartPtr<DynObject, ElementType>::operator== (const SmartPtr & _dynObject){ if (m_dynObjPtr == _dynObject.m_dynObjPtr){ return 1; } return 0; } When I attempt to invoke my smart pointer's (SmartPtr's) equivalence test overload I get the following linker error: MainEntry.obj : error LNK2001: unresolved external symbol "public: int __thiscall SmartPtr<class Test,int>::operator==(class SmartPtr<class Test,int> const &)" (??8?$SmartPtr@VTest@@H@@QAEHABV0@@Z) Debug/TimDynamic.exe : fatal error LNK1120: 1 unresolved externals When I take the member function out of the .cpp file and put the entire definition back into the class declaration (i.e. inline the member function): int operator== (const SmartPtr & _dynObject){ if (m_dynObjPtr == _dynObject.m_dynObjPtr){ return 1; } return 0; } It works fine. Is this a known problem with MV C++'s compiler? Or am I doing something wrong with this member function definition? Also, is it possible I'm not "feeding" the compiler some necessary switch? I've disabled optimization in the hopes that would fix it - but it doesn't. Thanks, Novice Tag: Compression algorithm question Tag: 212509
  - 18
    - DLL and calling convention Hi, I am having an issue with creating a DLL with calls to (among other things) the C standard library within. I have reduced my problem to the following pieces of code: /***************** dll.c ***************/ #include <stdio.h> #include <stdlib.h> int dt_read(FILE *f) { int status = EXIT_FAILURE; char buf[100]; if (f != NULL) { if (NULL != fgets(buf, sizeof buf, f)) { buf[sizeof buf - 1] = 0; puts(buf); status = EXIT_SUCCESS; } } return status; } /****************** end of dll.c **************/ This code is compiled and linked into a DLL with the following .def file: /*************** begin dll.def ****************/ LIBRARY DLL DESCRIPTION "dll test dll" VERSION 1.0 EXPORTS dt_read /*************** end dll.def *******************/ Then another application uses the code (dynamically linking to the DLL) as follows: #include <stdio.h> #include <stdlib.h> #include "dlltestdll.h" int main(void) { int status = EXIT_FAILURE; FILE *f; f = fopen("main.c", "r"); if (NULL != f) { char buf[100]; if (NULL != fgets(buf, sizeof buf, f)) { buf[sizeof buf - 1] = 0; puts(buf); } status = dt_read(f); } fclose(f); return status; } As the code shows, there are two similar calls to fgets, one from the program itself, and the other one from the DLL. While the first call succeeds, the second one fails somewhere deep into fgets. I can only imagine that this is cause by some corruption due to bad calling conventions, but am at lost as to how to correct/manage it. Any hints ? -- Bertrand Mollinier Toublet int main(){char*strchr();int j=1234;char t[]=":@abcdefghij-lmnopqrstuv" "wxyz.\n",*i="iqgbgxmbbla.llsvoaz:zdxylaxejivnidhd@ttopnjeftuh-i";while (*i){j+=strchr(t,*i++)-t;j%=sizeof t-1;putchar(t[j]);}return 0;} Tag: Compression algorithm question Tag: 212506
  - 19
    - CEdit notification Hello! I put an edit control on a toolbar. Now I need to intercept a message when a user pushes Enter key after entering text in the edit control. I tried to override OnKeyDown, but I still do not get any notification there. so how can i get that notification? Tag: Compression algorithm question Tag: 212500
  - 20
    - Keyboard input Hi, I have a program which controls the mouse and keyboard by installing system hooks. Both are controlled via pre-recorded data and call SendInput based on this data. The data consists of nothing more than what key was pressed, where the mouse moved, etc. What I'm looking for is a way to disable the user from physically pressing any keyboard button except escape. I found BlockInput in MSDN, which would be very useful, except it disables all physical input. Is there a way to detect if the user physically pushed a button on the keyboard, rather than sending SendInput messages, or WM_KEYDOWN? Thanks for any suggestions! Gary Tag: Compression algorithm question Tag: 212498
  - 21
    - How to get Memory Usage Status for all routines in a project? Hi, I'm wondering if there's any program like "profile" to tell us the memory usage for all routines in one program(project). Profile only can tell CPU time. Thanks a lot! Helen Tag: Compression algorithm question Tag: 212497
  - 22
    - Is it possible to make a MFC dialog In-Proc when called from and ATL COM from VB? Hi, I have an ATL COM object that contains a MFC Dialog. One method of my ATL must allow me to display the dialog in modal (DoModal). I use this ATL COM in my VB app. I want to call the ATL Method from my VB app to make the MFC dialog appear in modal. The problem is : The dialog appears, but is not in-proc. So I receive a message each time I click on the parent window (not a beep sound, but really a message). Is it possible at all to make my dialog appear in-proc or it is a limitation of the COM (or VB) usage? Someone talked to me about In-Proc server, but I really don't understand this concept. I don't understand why calling 2 methods make my dialog out-of-proc. Can someone explain it to me plz? Thanks ThunderMusic P.S. I posted to all the groups that can be concerned by this, if anyone think it's abusive, plz let me know. Tag: Compression algorithm question Tag: 212492
  - 23
    - Question about type conversion and casting hello Here is a part of code to read a whole binary file into memory #include <fstream> . . BYTE *pData; long lDataLen; pms->GetPointer(&pData); lDataLen = pms->GetSize(); // Read one line at a time till end of file.. if (m_inFile.getline(pData, lDataLen))pms->SetActualDataLength(strlen((char*)pData)+1); else {return S_FALSE;} I get the following error message error C2664: 'class std::basic_istream<char,struct std::char_traits<char> > &__thiscall std::basic_istream<char,struct std::char_traits<char> >::getline(char *,int)' : cannot convert parameter 1 from 'unsigned char *' to 'char *' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast .............................. Would someone please tell me how can i remove this error and which casting type would be better to use here and how? thanks Tag: Compression algorithm question Tag: 212488
  - 24
    - App Path How can I get the app path the program is running in? Thanks Tag: Compression algorithm question Tag: 212486
  - 25
    - Call ASP page from C EXE does any one knows how can call(execute) some ASP script from my c application. Actually i wan to send an ASP page (that will be online Invoice) to my client though my application any idea how i will call that specific page ? like "http://somedomin.com/myaspInvoice.asp" from my VB application any comments will be appriciated Thank You In advance Ahsan Tag: Compression algorithm question Tag: 212464
- Next
  - 1
    - text read/write hi all, well, it is crutial for my project that i be able to insert text to file using C++. This is easy but the tought thing is that the text is not written in LATIN characters(i.e arabic,russian..). does anyone know what might be the problem? your help would be highly appreciated Thank you in advance Tag: Compression algorithm question Tag: 212462
  - 2
    - C++ standard Hello, I see many times people quote from c++ standard, I was wondering where do I get it ? Is it free ? I need to pay for it ? Thank you all Tag: Compression algorithm question Tag: 212461
  - 3
    - I wanna use MAPI. Hi all, I wanna use the Message API in my project, but I don't know with which .obj or .dll file to link :( Would you please to tell me, thanks a lot. Deng Lor Tag: Compression algorithm question Tag: 212450
  - 4
    - <iostream.h> VS <iostream> Hi all, I have a simple code below; *** #include <iostream> using namespace std; int main (void) { int myArray[10] = {0}; int i; for(i=0;i<10;i++) { myArray[i] = i; cout << myArray[i]; } return 0; } *** Can anyone explain why the pair of "#include <iostream.h>" and "using namespace std;" gives an error of "error C2871: 'std' : does not exist or is not a namespace" message." and the one of "#include <iostream>" and "using namespace std;" does NOT? Sorry for this very basic question, I just want to learn very authentic, solid C++. On 'C:\Program Files\Microsoft Visual Studio\VC98 \Include\' folder I do have two files; one is "IOSTREAM" (with no file extension) and the other is "IOSTREAM.H". Does this give us a clue? Why do the two exist? I am using VC++ version 6.0. Thanks for your time. --- Tetsuya Oguma, Sydney, Australia Tag: Compression algorithm question Tag: 212449
  - 5
    - Unhandled exception Hi all, At the moment when execution hit a line, "cout.setf (ios::fixed);" the following message appears. "Unhandled exception in Random.exe: 0xC0000005: Access Violation only with OK button Then my Visual C++ 6 IDE has titile of "[break] - [disassembly]", showing me an yellow arrow-pointed memory address (30303030) and its associated value (???); "30303030 ???" Now my three questions are as follows; 1. What does this represent, 2. Why is this different from the one shown on the error message, 0xC0000005?, and 3. What should I do with this? It seems that I can only do "stop debugging (Ctrl + F5") from here. Variable Windows shows the "30303030()" in Context drop-down and nothing else. Is this of any use??? By the way how can I make line number appear on the Main window on VC++ version 6? Thanks for your time. --- Tetsuya Oguma, Sydney, Australia Tag: Compression algorithm question Tag: 212448
  - 6
    - LNK2005: function already defined My workspace consists of two projects, one Win32 application project and one static library project. The code is in fact in C language instead of C++. Some of the funcitons declared and defined in the file that contains WinMain() is in conflict with other functions of the same name in the library project. I moved the declarations to a header file, and the linking problem still exists. Can anybody give me some possible reasons? Thank you in advance. Steven Tag: Compression algorithm question Tag: 212447
  - 7
    - VS .Net 2003 - excel addin - xll build - any success? Has anyone been able to successfully build an excel add (.xll) file using VS 2003 .Net? I have a large project - cant get a valid add-in. Went to MSDN web site, downloaded simple example - Anewxll. This would build and install successfully either. Problem seems to be the extensive use of read/write strings in c++. This initialize code breaks. for(nFuncs=0; func[nFuncs][0]; nFuncs++) { for(i=0; i<9; i++) { func[nFuncs][i][0] = (BYTE) strlen(func[nFuncs][i]+1); } When I compile with /Gf option, I get this error message. c1xx : warning C4349: /Gf is deprecated and will not be supported in future versions of Visual C++; remove /Gf or use /GF instead ################## Any ideas? Alternative for me is to re-write initialization routines for production add-ins that have been working perfectly for years. Tag: Compression algorithm question Tag: 212423
  - 8
    - How to set wall paper.. Hi, I want to set an image as the wall paper. Can u please let me know how I can accomplish this task..I appreciate your help.. Thanks in advance, Sreekanth. Tag: Compression algorithm question Tag: 212410
  - 9
    - How to fix LNK2001 Error Hello All, When I do a build .exe, I get the following error message: TokenUtility.obj : error LNK2001: unresolved external symbol _token_GetProperty@20 The project is set to Win32 Console App. How to fix? Also what does the @20 mean? Thanks in advance, Henry Tag: Compression algorithm question Tag: 212404
  - 10
    - directx header files not found Hi, Can anyone help me, its the simplest of problems but I am stuck. I am trying to install DirectX9 sdk, when I compile I get the error message that the d3d9.h files are not found, however I have set the include environment variable to point to the correct folder. Any ideas? Wayne Tag: Compression algorithm question Tag: 212386
  - 11
    - Newbie question: Calling VB function from a C DLL w/out crashing VB I have been scratching my head for several hours now trying (yet again - gave up the first time) to successfully call a Visual Basic function from a C DLL, place a watch on a string passed ByVal, and exit the function ALL without crashing VB. As long as I don't actually look at the contents of the passed string, it works great! Soon as I look at it, though, VB up and dies _after_ exiting the VB function. Does anyone know how to do this? I've tried it using character pointer, BSTRs, user-defined data types, and nothing works. I've tried allocating memory for the BSTRs using SysAllocString and not freeing the memory using FreeSysString (and flip-side calling FreeSysString) and nothing works. Please Help! -- Brian ====== www.ftpserverapi.com --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.502 / Virus Database: 300 - Release Date: 7/18/03 Tag: Compression algorithm question Tag: 212383
  - 12
    - random numbers Hi, I am trying to populate a listbox with random numbers. The problem I am having is that the populate is called so quickly that the rows are populated with the same numbers for example 1 5 7 8 9 4 5 1 5 7 8 9 4 5 1 5 7 8 9 4 5 1 5 7 8 9 4 5 1 5 7 8 9 4 5 for (i=0;i<20;i++) value[i] = Rand(1000); int Rand(int n) { return rand() % n ; } Any ideas?? Tag: Compression algorithm question Tag: 212373
  - 13
    - Help:About exchange info How I exchange variable in two dialog? there are many info to be exchanged. Should I use Global variable? Do someone have good settlement? Tag: Compression algorithm question Tag: 212369
  - 14
    - GetJob API returns incorrect value for TotalPages Hi I am developing port monitor for printer monitor I want to log number of pages printer by user. So in EndDoc callback function I use GetJob with Job_info_2 I am using Job_info_2.TotalPages member variable to get that information. When I print 1 page with multiple copies. this member containes 1 instead of number of copies. For more than one page it reports correct number. vijay Tag: Compression algorithm question Tag: 212368
  - 15
    - Clipboard problem again I under stand that "The data for private clipboard formats is not freed by the system when the clipboard is emptied. Therefore, the clipboard owner should free the data upon receiving the WM_DESTROYCLIPBOARD message. For more information about private clipboard formats, see Clipboard Formats." And i freed the global memory if (globalMemHandle) { HGLOBAL temp = GlobalFree(globalMemHandle); globalMemHandle = 0; } the "temp" is NULL after this but still if i copy a bitmap in a loop the system memory keep on decreasing. And it is eating the system perfomance .. The Application which i am working on is a Bitmap editor which will crash after a continuos copy of a bitmap.. Can somebody help on this. Pls Max Tag: Compression algorithm question Tag: 212366
  - 16
    - PostMesssage does not work hi, I have a program that is the action methode of a web form, I mean it is run when a form is submitted to my webserver, can this program send messages to other applications on that server ? If yes, how? It seems PostMessage does not functions! thanks, Behzad Tag: Compression algorithm question Tag: 212363
  - 17
    - DLL self-registering sample code I cannot find any sample code for DLL's to self-register. Tag: Compression algorithm question Tag: 212346
  - 18
    - Programming to USB Hello everybody, I am in urgent need of a method to read and write to a USB Port .Any example regarding USB Modem,USB Webcam would be very very helpful.Where can i get the required sdk's or the progamming techniques to the USB port.I am a INTERMEDIATE LEVEL programmer to the serial Port. Pls reply to my mail address too. Thanks in advance, Suresh. Tag: Compression algorithm question Tag: 212321
  - 19
    - problem with spin control Hello! I am trying to display both an edit and a spin control inside a toolbar. so i added both of them, and set the edit to be a buddy for the spin. When the toolbar is displayed, they seem pretty happy together, but as soon as I click inside the edit, spin disappears and you have to redraw the whole toolbar for it to come back. When you drag the spin conrol to a dialog resource, it works fine, but here I am trying to do the same thing programmatically. Perhaps, I am missing some steps... Anyway, I would appriciate any advice. Tag: Compression algorithm question Tag: 212316
  - 20
    - Dynamic loading of dll with class(es). How? Suppose I have a class in my win32 dynamic dll. The class is exported using the good old __declspec(..). 1) How do I load the dll at run time (dynamically) in my simple "int main()"? Lots of tutorials neglect this issue or come up with half/advanced code. I'd love to see just a simple and complete example. 2) I'm confused: Is it possible to use modern C++ code in a dll? What are my options in doing so? Thank you all, V~ Tag: Compression algorithm question Tag: 212311
  - 21
    - Problem using, ATL COM, CString and vector in a tree structure Hi, I'm developing an ATL COM Object that contains a tree structure. ` This structure is defined like this : struct SPreferenceObject { CString strKey; CString strControlType; CString strText; long lLeft; long lTop; long lWidth; long lHeight; vector<IPreferenceObject*> Children; }; I'm in the class CPreferenceObject that is the implementation of IPreferenceObject (CoClass). When I want to add a child to the structure, I do a CoCreateInstance of a new IPreferenceObject with the clsid of CPreferenceObject... well, this part seems to work fine since I'm able to put the information and get it back. But, until now, I was able to add up to 3 nodes then it crashed. If I add a 4th node(1 root, the 3 leaves), it crashes. When I add 3 nodes in one branch (1 root, 1 branch, 1 leaf = the root has one child, and this child has 1 child too), it crashes too. I would need to send the code so you can see what is the problem, but the groups does not accept binaries. So if someone want to help, I can send them the code by e-mail. I really needs it. Thanks ThunderMusic Tag: Compression algorithm question Tag: 212299
  - 22
    - Is it Multi Byte clean?? Is the basic_string member find methods multi-byte clean? Can I reuse the following code as it is on a multi-byte platform? #include <string> #include <iostream> using namespace std; void main( ) { string dateDayString ( "07252003FRIDAY" ); size_t indexCh = dateDayString.find_first_not_of ( "0123456789" ); if (indexCh != string::npos ) { string weekDay = dateDayString.substr(indexCh); cout << "WeekDay is " << weekDay.c_str() << "\n" ; } else { cerr << "String is not good.\n" ; } } Tag: Compression algorithm question Tag: 212298
  - 23
    - how can i start a program whithin a c++ program and receive the output from how can i start a program whithin a c++ program and receive the output from the program. for example start "dir *.h" in a specific directory and get the result. i need the programs stdout and stderr. i tryed "system", "_exec*" and "_spawn*" but i didn't find out how to receive the results. any idea? richard Tag: Compression algorithm question Tag: 212292
  - 24
    - tearoff interfaces Hi. After reading some stuff from Don Box's book "Essential COM" about tearoff interfaces, I am wondering if this is possible from VB. Can a TLB be compiled that would support this, or is this strictly a C++ coding technique? thanks. Tag: Compression algorithm question Tag: 212289
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    - interface substitution Hi. I'm posting this question in this newsgroup in the hope that someone here can help me out. I am currently working on a VB project and find myself needing to do what I am calling interface substitution. Specially, I am wondering if it's possible, in COM, to temporarily substitute a particular interface on an object with the same interface of a different object. I would like to replace the ICollection interface on one of my objects with a "visitor's" ICollection interface and then replace the original interface after I have done some operations on the ICollection. Of course, this all needs to be transparent to the caller. If this is possible, can someone provide some C++ code samples? Also, again, if this is possible, could this technique be used from VB...even if a C++ DLL is doing this for the VB DLL? thanks much. Tag: Compression algorithm question Tag: 212288

Hi,

I've been reading in a stream of data from a data file where sometimes the
data is uncompressed, and other times it is compressed. The uncompressed
data is a list of longs - if I know there are 1001 data points, I do this:

long* plArray = new long[1001];
DWORD dwRead;
HRESULT hr = pStream->Read(m_plArray, 1001*sizeof(long), &dwRead);

However, every now and then I come across a chunk of data where I know that
I expect those 1001 data points, but the size of the data file is
approximately 1/4 the size it should be (.ie. instead of being 4004 bytes,
it might be say 1200 bytes). Its obviously been compressed - I'm guessing
there's no encryption involved. There is a boolean just before the data
stream starts that indicates whether compression has been applied or not, so
I don't need to guess that based on the data size.

If I know what the data _should_ be (I have a list of the what the
unencrypted data is), could anyone gives me any tips/pointers as to what
compression algorithm is being used?

I'm new to this compression side of things. I'm just reading now about
Shannon-Fano and Huffman coding for the first time. Maybe someone who's an
expert wouldn't mind giving me a start in working out the algorithm applied.

Thanks in advance,
Alain Dekker

Re: Compression algorithm question by lallous

lallous
Wed Jul 30 02:23:08 CDT 2003

Hello,

I guess it is hard to tell what algo is used and how it is being used...
Perhaps if you reverse engineer the application that is generating this file
you can then get hints on what algo is being used.

Regards,
Elias

Re: Compression algorithm question by Alain

Alain
Wed Jul 30 03:26:18 CDT 2003

A colleague at work suggested that, but to be honest, I wouldn't have a clue
where to start to do that, and while I know MFC/C++ very well, I know almost
no assembler.

Thanks for that suggestion, though.

Alain

"lallous" <lallous@lgwm.org> wrote in message
news:uw$3%23vmVDHA.2228@TK2MSFTNGP12.phx.gbl...
> Hello,
>
> I guess it is hard to tell what algo is used and how it is being used...
> Perhaps if you reverse engineer the application that is generating this
file
> you can then get hints on what algo is being used.
>
> Regards,
> Elias
>
>