Managed C++/CLI

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Mixing managed and unmanaged code Alexandru Savescu6-Jun-02 0:58 Alexandru Savescu 6-Jun-02 0:58  Suppose I have an old application with unmanaged code and I adding some .NET classes that are of course managed. The question is: Will my unmanaged code be compiled as native code and the managed code will be CLR metadata? I am asking this, because I want my old, unmanaged part of application to be very fast, not a MSIL that is at first run (?) compiled into native code. Best regards, Alexandru Savescu Re: Mixing managed and unmanaged code Nish Nishant6-Jun-02 1:38 Nish Nishant 6-Jun-02 1:38  Use #pragma unmanaged to specify that the following code is to be compiled to native code and #pragma managed when you end the native stuff Author of the romantic comedy Summer Love and Some more Cricket [New Win] Buy it, read it and admire me Re: Mixing managed and unmanaged code Alexandru Savescu7-Jun-02 10:00 Alexandru Savescu 7-Jun-02 10:00  Thanks Nish! However what if I want to declare a managed type inside of an existing class? Will then my whole class be managed? (This is something that I would not like ) Best regards, Alexandru Savescu Re: Mixing managed and unmanaged code Nish Nishant7-Jun-02 14:07 Nish Nishant 7-Jun-02 14:07  Alexpro wrote: Will then my whole class be managed? (This is something that I would not like ) No. If you want to use a managed type inside say your CDialog class, then you'll have to only add #pragma managed for the function in the class, where you use the managed type. That was how it was in Beta 2. I didn't chk to see if it allows you to have a managed line of code inside an unmanaged marked function. I should think not! Nish Author of the romantic comedy Summer Love and Some more Cricket [New Win] Buy it, read it and admire me Re: Mixing managed and unmanaged code Alexandru Savescu7-Jun-02 21:48 Alexandru Savescu 7-Jun-02 21:48  Nish - Native CPian wrote: if it allows you to have a managed line of code inside an unmanaged marked function. I should think not! It doesn't! Best regards, Alexandru Savescu Re: Mixing managed and unmanaged code Nish Nishant7-Jun-02 21:45 Nish Nishant 7-Jun-02 21:45  Alexpro wrote: It doesn't! Well, at least, they granularised at the function level instead of at the class level which would have been horrible. Nish Author of the romantic comedy Summer Love and Some more Cricket [New Win] Buy it, read it and admire me Fatest Way Around Sidney5-Jun-02 15:33 Sidney 5-Jun-02 15:33  Hi everyone, I need advice regardin my problem, here's my problem: I have a Text File(serves as my database) with 3 colums fixed length, example Name Address Age AAA 123 Anywhere 12 BBB .... ... Joseph 345 Somewhere 15 Rosie 098 Cool DC 20 I need to search this Text File, in the real world this Text File migh contain 1 Million records as soon as we populate our database. My question is... what is the fastest way to search for a particular string in this text file. Note: I only search for the name, If I find the name... I need to get the enrite line and process it. I will really appreciate any help that you can give me. Thanks/Regards Sidney Re: Fatest Way Around Alexandru Savescu5-Jun-02 18:01 Alexandru Savescu 5-Jun-02 18:01  I will give you a fast, but memeory consuming solution. Use a std::map to store the name as keys and you make a struct to store the address. Read the whole file and fill the map. Then, when you search the name you will use std::map::find that will do a binary search. At the end of the program you iterate through the map and write it to the file. If you have multiple entries with the same name you may consider multimap. Since you post it to the Manage C++ you may also consider hash_map. Best regards, Alexandru Savescu Re: Fatest Way Around Sidney5-Jun-02 18:22 Sidney 5-Jun-02 18:22  Thanks Alexandru! I'll see if I can do this, do you have sample code that used STL Map? if you have would you be so kind to share it with me? And by the way just for info... the fields are of Fixed length, example Field Name Position Length Fld1 1 10 Fld2 11 21 etc... Thanks/Regards Sidney Re: Fatest Way Around Alexandru Savescu5-Jun-02 18:22 Alexandru Savescu 5-Jun-02 18:22  You can look at the article on CP about STL here. Also you can read MSDN (the one that comes with .NET is nicer than the VC6.0's one), or the SGI documentation. Best regards, Alexandru Savescu Re: Fatest Way Around Sidney6-Jun-02 9:06 Sidney 6-Jun-02 9:06  Hi Alexandru, I get an error in my code when I try to use the multimap, the error is "Cannot open include file: 'multimap' C++" can you help me? here's my code: #include <string> #include <iostream> #include <multimap> using namespace std; struct ltstr { bool operator()(const char* s1, const char* s2) const { return strcmp(s1, s2) < 0; } }; int main() { multimap<const char*,="" int,="" ltstr=""> m; m.insert(pair<const char*="" const,="" int="">("a", 1)); m.insert(pair<const char*="" const,="" int="">("c", 2)); m.insert(pair<const char*="" const,="" int="">("b", 3)); m.insert(pair<const char*="" const,="" int="">("b", 4)); m.insert(pair<const char*="" const,="" int="">("a", 5)); m.insert(pair<const char*="" const,="" int="">("b", 6)); cout << "Number of elements with key a: " << m.count("a") << endl; cout << "Number of elements with key b: " << m.count("b") << endl; cout << "Number of elements with key c: " << m.count("c") << endl; cout << "Elements in m: " << endl; for (multimap<const char*,="" int,="" ltstr="">::iterator it = m.begin(); it != m.end(); ++it) cout << " [" << (*it).first << ", " << (*it).second << "]" << endl; } Thanks/Regards Sidney Re: Fatest Way Around Alexandru Savescu6-Jun-02 9:35 Alexandru Savescu 6-Jun-02 9:35  Hello sidney The < and > tags were stripped by the html parser. Please send the code between <pre> and </pre> so I can see what you include and what include not. However this code sould work #include <multimap> using namespace std; .... Best regards, Alexandru Savescu Re: Fatest Way Around Sidney6-Jun-02 11:04 Sidney 6-Jun-02 11:04  Here's the code: #include <string> #include <iostream> #include <multimap> using namespace std; struct ltstr { bool operator()(const char* s1, const char* s2) const { return strcmp(s1, s2) < 0; } }; int main() { multimap<const char*, int, ltstr> m; m.insert(pair<const char* const, int>("a", 1)); m.insert(pair<const char* const, int>("c", 2)); m.insert(pair<const char* const, int>("b", 3)); m.insert(pair<const char* const, int>("b", 4)); m.insert(pair<const char* const, int>("a", 5)); m.insert(pair<const char* const, int>("b", 6)); cout << "Number of elements with key a: " << m.count("a") << endl; cout << "Number of elements with key b: " << m.count("b") << endl; cout << "Number of elements with key c: " << m.count("c") << endl; cout << "Elements in m: " << endl; for (multimap<const char*, int, ltstr>::iterator it = m.begin(); it != m.end(); ++it) cout << " [" << (*it).first << ", " << (*it).second << "]" << endl; } Thanks/Regards Sidney Re: Fatest Way Around Alexandru Savescu6-Jun-02 19:50 Alexandru Savescu 6-Jun-02 19:50  Well, the multimap header does not exists. Include <map> and it will work; #include <map> using namespace std; etc. Best regards, Alexandru Savescu Re: Fatest Way Around Sidney5-Jun-02 18:28 Sidney 5-Jun-02 18:28  And also, I just want to make it clear... if I have same name in my name field I can use the STD::MAP? if so how can I use the multimap? and is Hash_map fast too? can I also have more info about it? Thanks/Regards Sidney Re: Fatest Way Around Sidney6-Jun-02 9:03 Sidney 6-Jun-02 9:03  Hi everyone, i tried to use the multimap(STL) but I got an error "fatal error: Cannot open include file: 'multimap' C++" I alread installed the all the files that I got from sgi... STL Version 3.3, I installed it in "C:\Program Files\Microsoft Visual Studio\VC98\Include" What could be the problem? Thanks/Regards Sidney Re: Fatest Way Around Alexandru Savescu7-Jun-02 10:03 Alexandru Savescu 7-Jun-02 10:03  I think you need not replace the STL that comes with Visual C with the SGI implementation. Best regards, Alexandru Savescu WinForms? Alexandru Savescu3-Jun-02 11:55 Alexandru Savescu 3-Jun-02 11:55  Again with some newbie question. I have started a C# windows application and it look really nice with all those new controls and the WinForms stuff (looks much more to Delphi than VB 6 though ). I was wondering how I can use WinForms in MC++? I mean draging and dropping WinForms components on the managed form and stuff like that. Thanks Best regards, Alexandru Savescu Re: WinForms? James T. Johnson3-Jun-02 12:27 James T. Johnson 3-Jun-02 12:27  You can't MC++ lacks the CodeDOM support which is required for a visual designer to write the neccesary code. James Simplicity Rules! Re: WinForms? Rama Krishna Vavilala3-Jun-02 15:42 Rama Krishna Vavilala 3-Jun-02 15:42  Check this out. If you have VB6 you can use the designer. I have not yet tried it. http://www.gotdotnet.com/userfiles/toml/VBWinForms.zip Re: WinForms? Nish Nishant3-Jun-02 19:31 Nish Nishant 3-Jun-02 19:31  http://www.codeproject.com/useritems/mcppwinforms01.asp http://www.codeproject.com/managedcpp/mcppwinforms02.asp http://www.codeproject.com/useritems/mcppoutlookgui.asp Nish Regards, Nish Native CPian. Born and brought up on CP. With the CP blood in him. Re: WinForms? Alexandru Savescu4-Jun-02 6:41 Alexandru Savescu 4-Jun-02 6:41  Thanks Nish, but as you said in the first article, there is now GUI support in Manage C++ Best regards, Alexandru Savescu Re: WinForms? Nish Nishant4-Jun-02 17:30 Nish Nishant 4-Jun-02 17:30  Alexpro wrote: Thanks Nish, but as you said in the first article, there is now GUI support in Manage C++ Yeah, that's really sad!!! Nish Regards, Nish Native CPian. Born and brought up on CP. With the CP blood in him. Do I have to use pointers only? Alexandru Savescu2-Jun-02 21:57 Alexandru Savescu 2-Jun-02 21:57  Hi! I just my first semi-project in .NET that combines both MFC and MC++ and it works fine! However, when I needed to use any .NET classes I had to declare them as pointers and pass pointers to methods etc., like this SqlConnection* s = new SqlConnection(); f (s); Is this the only way it works? Apparently yes, and I feel sad, I've been using C++ for a while and got used to using references and not pointers.... Best regards, Alexandru Savescu Re: Do I have to use pointers only? Nish Nishant3-Jun-02 4:20 Nish Nishant 3-Jun-02 4:20  You'll have to create all reference types on the heap. Thus you cannot have a String but only a String*. On the other hand you can have value types on the stack. Nish Regards, Nish Native CPian. Born and brought up on CP. With the CP blood in him.

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