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Re: How to initialize the follow parameter in Maer72729-Aug-01 21:35 Maer727 29-Aug-01 21:35  Hi, my pal. Thanks for your reply. I have read the information about SHGetDesktopFolder, IShellFolder::ParseDisplayName, SHGetDataFromIDList in MSDN. Can you show me a sample code using the functions you mentioned before to get the first level of "NETRESOURCE" of the "Network Neighborhood"? Thanks again. Best regards. Maer Why add "WINAPI" ahead of a function? Maer72729-Aug-01 4:55 Maer727 29-Aug-01 4:55  (the follow is from MSDN) BOOL WINAPI EnumerateFunc(HWND hwnd, HDC hdc, LPNETRESOURCE lpnr); What is the function "WINAPI" here? Thanks. Maer Re: Why add Joaquín M López Muñoz29-Aug-01 6:05 Joaquín M López Muñoz 29-Aug-01 6:05  WINAPI specifies the calling convention of the function. The calling convention is the set of rules followed to pass arguments to and invoke a function. Some aspects a calling convention must define are Whether parameters are stored in registers or in the stack, the order in which parameters are stored in the stack (first parameter the first to be pushed or the other way round), whose responsibility it is to clean the stack after return, how the return parameter is passed from the function to the invoker. So, different languages typically specify different calling conventions (notably, the Pascal calling convention is that the callee clean the stack before returning, whereas in C it is the caller that does the job). If a function is invoked with a different calling convention than expected, crash is almost sure to happen. The language C (as implemented by Microsoft) allows the specification of the calling convention of a function so that you can invoke it even if it does not follow the C calling convention. Some calling conventions are: __cdecl, the C default calling convention, __stdcall, aka PASCAL, __fastcall, __thiscall, etc. WINAPI is simply a macro for __stdcall, and ensures that your program calls Windows APIs the Pascal way. Why do Win32 APIs use the Pascal calling convention instead of __cdecl? Remember that these functions inhabit global DLLs of the system and are invoked by different programs written in different languages, so they just had to stick to some particular convention. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo Re: Why add Maer72729-Aug-01 20:02 Maer727 29-Aug-01 20:02  Thanks pal. I still have a question. In __stdcall calling convention, the callee cleans the stack, so it can not be a vararg function. In __cdecl calling convention, the calling function cleans the stack, so it can be a vararg function. I do not understand "the calling function cleans the stack, so it can be a vararg function" and "the callee cleans the stack, so it can not be a vararg function". Can you explain the mechanism of stack cleaning and vararg function? Thanks. Maer Re: Why add Joaquín M López Muñoz29-Aug-01 20:05 Joaquín M López Muñoz 29-Aug-01 20:05  Michael Dunn already answered Re: Why add Maer72729-Aug-01 22:10 Maer727 29-Aug-01 22:10  Thanks all the same. Best regards. Maer Data Compression Alogrithm Ganesh Ramaswamy29-Aug-01 4:47 Ganesh Ramaswamy 29-Aug-01 4:47  Hello, Can some one suggest a Data compression algorithm and if possible a link to the algorithm. Mainly my data types are either text or bitmap. Thanks for the time. Ganesh.M.Ramaswamy Re: Data Compression Alogrithm Chris Losinger29-Aug-01 5:33 Chris Losinger 29-Aug-01 5:33  www.zlib.org zLib is pretty much the public domain standard in data compression. it's fast, well tested, does a good job (equivalent to ZIPping the data file) and, it's free! -c ------------------------------ Smaller Animals Software, Inc. http://www.smalleranimals.com What's wrong with the convertion?:ostringstream->CComVariant 29-Aug-01 4:07 29-Aug-01 4:07  What's wrong with the convertion?: CComVariant varStrRet(ostrBuffer.str().c_str()); ostrBuffer is ostringstream. Everithing works fine but if I load more then aprox. 500Kb into ostrBuffer the the convertion result in access violetion. Enyone knows why? Thanks a lot for any help Peter Subclassing ManjuG29-Aug-01 3:20 ManjuG 29-Aug-01 3:20  I would like to know how to create an ActiveX control from an existing Windows Control Re: Subclassing Carlos Antollini29-Aug-01 3:51 Carlos Antollini 29-Aug-01 3:51  Is a Standard Control? or you Own Control? Cheers... Carlos Antollini. Subclassing ManjuG29-Aug-01 4:13 ManjuG 29-Aug-01 4:13  I want to develop a control similar to a CComboBox Re: Subclassing Carlos Antollini29-Aug-01 7:19 Carlos Antollini 29-Aug-01 7:19  Is a class Derived From CComboBox or CWnd? Carlos Antollini. Re: Subclassing ManjuG29-Aug-01 20:54 ManjuG 29-Aug-01 20:54  The class is derived from CComboBox Changing Icon for an .exe file Vijay S29-Aug-01 2:52 Vijay S 29-Aug-01 2:52  Hi , I want to change the windows default icon of an .exe file to some of my own . The exe file I have does not any window for which I can load a resource and assign an icon. It is a simple console based application calling a few functions and it does not give out any output on the console. Can anyone suggest me a method to do so. Thanks Vijay Re: Changing Icon for an .exe file Joaquín M López Muñoz29-Aug-01 6:10 Joaquín M López Muñoz 29-Aug-01 6:10  I don't have my Visual Studio handy, but all you have to do is insert an icon using the resource insertion menu (maybe under Insert/Resource). You'll be asked to confirm that a .rc and a resource.h be included in your project. This should suffice. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo Re: Changing Icon for an .exe file Vijay S30-Aug-01 19:37 Vijay S 30-Aug-01 19:37  Thanks that did the job Vijay Vijay S COMM problem Sandeep Shetty29-Aug-01 1:48 Sandeep Shetty 29-Aug-01 1:48  Hello!! I am trying to send and receive some data using COMM(communications ). I have got the handle to COMM by the use of lineGetID(). I have only modified the timeout value (commtimeouts.ReadIntervalTimeout = 3000; and set the others to zero).. When I transmit the data from the client it gives error in the client saying ERROR_ALREADY_EXISTS (0x000000b7).. Could you please advise what could be the problem... Sandeep Simple/Extended MAPI & CDO AJ12328-Aug-01 23:38 AJ123 28-Aug-01 23:38  Hi, I am just about to start some email integration development. Trying to choose between Simple MAPI, Extended MAPI and CDO. All i need to do is open a message to be sent, with attachments already added and the destination address to be filled in by the user. At the moment i am swaying towards simple MAPI. Is this still going to be supported in the long term, or is extended MAPI replacing it. Cheers Richard Beginner's question about calendar controls 28-Aug-01 23:14 28-Aug-01 23:14  I need to implement a calendar control that can maintain the state of individual days. (A simple change in color of the particular day would sufice) I thought I would just be able to use the ActiveX controller but I can't see how to do it with that. If you know a good way to do this would you let me know. Actually I can maintain the state. I'm doing so in a data structure already, but I need a way to display this state to the user. I'm using VC++ 5.0 if that makes any difference. Thanks much, john Process Monitoring v_krishnan28-Aug-01 23:13 v_krishnan 28-Aug-01 23:13  Hi, I have built an application that launches many other processes and then monitors the state of those processes periodically. To monitor the status, I use the Process Id that I get when I call CreateProcess to create a process. But, I am having a problem with the current implementation - I have observed that the same process ID can be allocated to a process, if the previous one with is dead. This happens within a short time. Therefore, if I note the ID of a process and then monitor it after say, 1 minute I may be monitoring a some new process if the one that I started was killed. Is there any unique way to identify the process? Re: Process Monitoring Tomasz Sowinski29-Aug-01 0:37 Tomasz Sowinski 29-Aug-01 0:37  If possible, call CreateProcess from separate thread, then use WaitForSingleObject with process handle to get notified of process termination. Tomasz Sowinski -- http://www.shooltz.com Clipping Polygons / Lines to Visable area AndyC28-Aug-01 23:10 AndyC 28-Aug-01 23:10  Can any body help? I have got an application that draws a set of filled polygons and line to a CWnd Derived Object. There is also a zoom in/out functionality, which is where my problems start. If the user zooms in far enough the drawing starts to go a bit screwy. I am sure this is because when I convert the real world coordinates to screen coords some points are out side the 32000(98) / 64000(NT) limit on the size of the DC. What I would now like to do is impliment some clipping code that clipps all the plygons to the visable area. Does anybody have some code that does this ? Best Regards Andy Re: Clipping Polygons / Lines to Visable area 28-Aug-01 23:36 28-Aug-01 23:36  There's an algoritm from Cohen and Sutherland. Search for "Cohen", "Sutherland" and "clipping". A german description is in http://www.upb.de/cs/info-cd/vorlesungen/domik/computergrafik/node57.htm Volker Re: Clipping Polygons / Lines to Visable area AndyC28-Aug-01 23:59 AndyC 28-Aug-01 23:59  Thanks for your quick response. I have tried to impliment this algoritm, but I can apon problems for certain cases. One of which was when then line of the polygon started inside the polygon and then exited the rectangle on the left hand side. The polygon then moved around the bottom of the recangle in two or three stages and entered the polygon on the right hand side. This is caused brecause with this algoritm you consider/clip the polygon to one side of the rectangle at a time, and seeing as when the polygon is below and out side the recangle the line below the polygon are discarded, and the polygon becomes distorted. If I am incorrect then please tell me. Best regards Andy

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