Forward Declaration

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  - 1
    - import library I have an application that needs to import a DLL file for some database call like - #import "c:\Program Files\Common Files\System\ADO\msado15.dll" \ rename("EOF", "EndOfFile") the path is OS dependent - what if I run on some other PC but the msado15.dll is not specificed in the path specified? for this case - #import "c:\Program Files\Common Files\System\ADO\ any easy way to work around this problem where I don't have a hard coded path in my code?? ============ #import "c:\Program Files\Common Files\System\ADO\msado15.dll" \ rename("EOF", "EndOfFile") typedef ADODB::_RecordsetPtr RecPtr; typedef ADODB::_ConnectionPtr CnnPtr; class Database; class Table; class Database { public: CnnPtr m_Cnn; char m_ErrStr[500]; Database(); bool Open(char* UserName, char* Pwd,char* CnnStr); bool Execute(char* CmdStr, Table& Tbl); void GetErrorErrStr(char* ErrStr); }; class Table{ public: RecPtr m_Rec; char m_ErrStr[500]; Table(); void GetErrorErrStr(char* ErrStr); int ISEOF(); HRESULT MoveNext(); HRESULT MovePrevious(); HRESULT MoveFirst(); HRESULT MoveLast(); bool Get(char* FieldName, char* FieldValue); bool Get(char* FieldName,SYSTEMTIME& FieldValue); bool Get(char* FieldName,int& FieldValue); BOOL VariantTimeToSystemTimeWithMilliseconds (/*input*/ double dVariantTime, /*output*/SYSTEMTIME *st); }; Tag: Forward Declaration Tag: 290449
  - 2
    - REAL BRUTAL RAPE VIDEOS HERE.SEE IT AND ENJOY. ALL THE GIRLS WERE REAL BRUTAL RAPE VIDEOS HERE.SEE IT AND ENJOY. ALL THE GIRLS WERE SCREAM .BUT IT IS SWEAT.THE LINK IS BELOW http://onlinemillionare.blogspot.com/ ENJOY HOW SWEET IT IS Tag: Forward Declaration Tag: 290433
  - 3
    - connect to simple COM This is a multi-part message in MIME format. ------=_NextPart_000_002C_01C89E37.AB10E460 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable is there a simple example on C or CPP or MFC how i can connect to simple = COM that has one interface and some methods with their arguments thank you Dani ------=_NextPart_000_002C_01C89E37.AB10E460 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.6000.16640" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2> <DIV><FONT face=3DArial size=3D2> <DIV><FONT face=3DArial size=3D2>is there a simple example on C or CPP = or MFC=20 how i can connect to simple COM that has one interface and some = methods=20 with their arguments</FONT></DIV> <DIV><FONT face=3DArial size=3D2>thank you</FONT></DIV> <DIV><FONT face=3DArial=20 size=3D2>Dani</FONT></DIV></FONT></DIV></FONT></DIV></BODY></HTML> ------=_NextPart_000_002C_01C89E37.AB10E460-- Tag: Forward Declaration Tag: 290431
  - 4
    - My application does not register itself to windows file manager Hi, I have an application , it does not register itself to windows file manager ( I mean , if I double click on a document of my application type, it does not open) How can I make it register itself, Thanks, Tag: Forward Declaration Tag: 290424
  - 5
    - How to restrict inheritance in C++ I want to write a class, which by itself should restrict inheritance, something like final class in java. Is it possible to write one in c++? Regards, Alamelu N Tag: Forward Declaration Tag: 290420
  - 6
    - Question about heritance and other aspects. Question 1.-------------------------------------------------------------------------------------------------------------------------------------------- #include <iostream> using namespace std; class B { public: int i; B() {} }; class A { public: A(B& b1) { b1.i=0; } }; class C : public A { B b; public: C() : A(b) {} }; As the code above, b is a private object for class C. Why I can revise b as a reference in constructor of class A. As I know, even class C herites from class A, A can not revise any private properties in C, is that right? Question 2.-------------------------------------------------------------------------------------------------------------------------------------------- class A { public: A() {} friend ostream& operator << (ostream& os,A& ac) {} }; If I remove keyword "friend", operator << will be seen as a bit operator instead of a stream operator, why? (I think If I add keyword "friend" before the function declaration, it just means this function can revise private properties in class A, the keyword can not effect whether "<<" is a bit operator or not.) Question 3.-------------------------------------------------------------------------------------------------------------------------------------------- Sorry,I write ASM in C++ newsgroup, but it's related with my question. Coorder STRUCT X WORD ? Y WORD ? Coorder ENDS m_order Coorder <0,0> It's about storage space in C++ thinking from assembly language (IA 32 instruction set) ASM "STRUCT" itself(I mean declaration) will not be stored in storage space, but for ASM "STRUCT Variant"(m_order) it will live in storage space at runtime. (I don't know whether it's right.) this description let me think about "class" in C++. Can I say: the declaration of a "class" will not be stored in storage space? if what I said is right, how C++ compiler deals with inline function if "class" is not in storage space. Thank you for your help. Tag: Forward Declaration Tag: 290415
  - 7
    - Array of char pointers. If I had to say what "arr" is, I would say it is an array of pointers to chars. If so why is it intialized with strings instead of addresses? char *arr[] = { "a", "b", "c","dd", "eee" }; Also when looking at the values of the pointers (when they appear to be adjacent) they seem to decrease by at least 8 bytes ( two native size words?) even when the strings are a single character, which should be two bytes. So I am guessing they are on a stack if the addresses decrease but why 8 bytes each? Is it some type of linked list? I suppose it doesn't really matter but it is a curiosity and I am interested in how the language works. Thanks, gtb Tag: Forward Declaration Tag: 290408
  - 8
    - CString bug? Hi all, I run IBM Rational Purify on this code: CString aaa; for (int i=0 ; i<100 ; i++) aaa+= "xxxxxxxxxxxxxxx\n"; aaa.Replace("\n","\r\n"); Purify issues this warnning message: UMR: Uninitialized memory read in strstr {1 occurrence} aaa.Replace("\n","\r\n"); Is this a known issue? Is this a bug in CString/Purify? How can I work around this? Thanks very much! Dudu Arbel Tag: Forward Declaration Tag: 290405
  - 9
    - #pragma comment lib Hello everyone, Just want to confirm whether my understanding is correct. The statement in source file, [Code] #pragma comment(lib, "DLL1.lib") [/Code] has the same effect (as an alternative approach) of set DLL1.lib as implicit link library input in project link settings? So, we choose either one method to configure implicit linking input library? thanks in advance, George Tag: Forward Declaration Tag: 290393
  - 10
    - DLL vs static library I have a library build as a DLL with all the function exported like - ============= LIB_API BOOL CreateLibInstance(); LIB_API HRESULT PostRequest(string const& start, string const& end); LIB_API HRESULT LoadXMLData(LPCTSTR tszXMLFileName); LIB_API HRESULT GetTVData(); ============= but my friend told me to create a static Library instead of DLL, he said if I create a DLL - I will need to / have 1) .DLL 2) .Lib but for static library, I only create 1 .Lib file. which is easier files, but I looked into the DEBUG directory, I only found a DLL created for my DLL library project. Now I am confused. Did my friend told me wrong?? since my friend has alot experience on windows programming. ================ For me I believe static library (DLL) and static library (.Lib) is same thing expect DLL i need to export each function, which has abit more work. (since static library I do it the same as regular C++ programming) But I am still confused that a DLL project will have a DLL + a .Lib and I had been told it's less handy as static library. Tag: Forward Declaration Tag: 290386
  - 11
    - Compiler chooses conv ctor - why? Hello, In the following code conversion from class A object to class B object can be done in two ways: (1) by conversion function being member of class A (line 6); (2) by conversion constructor being member of class B (line 11). However conversion constructor is called. The sole way to make A::operator B() to be called is removing ,,const'' qualifiers (at lines 11 & 25). This causes that the only implicit conversion sequence goes throughout conversion function (declared at line 6). Why? It seems that according to 13.3 of ISO 14882 none of the sequences is better then other. Thus ambiguity should occur causing error. Could somebody point out what part of ISO 14882 causes that conversion constructor (and not conv foo) should be chosen and why conv ctor is better then conv foo? -- best regards Cezary Noweta ====== #include <stdio.h> struct B; struct A { operator const B() const; // Line 6 }; struct B { B(); B(const A& a); // Line 11 const B& operator=(const B&) const; }; A::operator const B() const { printf("conv foo called\n"); return(B()); } B::B() { } B::B(const A& a) // Line 25 { printf("conv ctor called\n"); } const B& B::operator=(const B&) const { return(this[0]); } const B foo(const A a) { return(a); } const B foo1(const A a) { return((const B)a); } const B foo2(const A a) { return(const B(a)); } main() { const A a; const B b; b = foo(a); b = foo1(a); b = foo2(a); } ====== Tag: Forward Declaration Tag: 290383
  - 12
    - C function prototype Is that for Class/Object function prototype, I must define the function in header file or .cpp file. MyClass::functionA(); MyClass::functionB(); but for C function prototype, I don't have to define if it's put before the main() function the following is not needed - void stradd (char *s1, char *s2); void stradd (char *s1, int i); ========= #include <iostream> // cannot be iostream.h?? #include <stdio.h> #include <string.h> #include <comdef.h> #include <conio.h> #include <windows.h> // must need for SYSTEMTIME //must need C/C++ > General > Debug Information Format to debug working using namespace std; // for cout must have?? // concatenate two strings void stradd (char *s1, char *s2) { strcat (s1, s2); // CRT <string.h> function } // concatenate a string with a "stringized" integer void stradd (char *s1, int i) { char temp[80]; sprintf (temp, "%d", i); strcat (s1, temp); } int main() { //SYSTEMTIME st = {0,0,0,0,0,0,0,0}; // cannot divide into 2 lines - must init all in one line SYSTEMTIME st = {0}; // OK too char str[80]; //char* str; // not OK will crash program strcpy (str, "Hello "); stradd (str, "there"); cout << str << "\n"; stradd (str, 100); cout << str << "\n"; stradd (str, "hihi"); cout << str << "\n"; return 0; } Tag: Forward Declaration Tag: 290381
  - 13
    - c++ event sink I have a function that will download XML from internet and load XML data into database. The function will take 5 - 20 minutes to finish. I heard I should use event sink (event listener) when function is finished the task, then it will notify the caller. So I am planning to create a seperate thread to do the long XML loading function by using - _beginthreadex() But how to create a notification / event sink / event listener in C++? any library can easily just a library function call? or any sample source code on the internet? Thanks Tag: Forward Declaration Tag: 290379
  - 14
    - which design is better to wrap another class instance Hello everyone, Some people doubt that the design below is inferior compared to design which makes f, either Foo* or Foo&. The reason is below design will waste memory space and degrade performance by creating a new instance. I think it depends. If we really needs to wrap a new instance, I think the following design is fine. If we needs to refers to an existing instance, this design is inferior because it will waste memory space and degrade performance by creating a new instance and destroy the original one. [Code] class Foo; class Goo { Foo f; // change to Foo* pf or Foo& rf is always better? } [/Code] thanks in advance, George Tag: Forward Declaration Tag: 290355
  - 15
    - re-entrancy pattern issue setbacks Hello everyone, Two questions about re-entrancy issue, http://www.codeproject.com/KB/COM/sta_issues.aspx 1. What is the setback of the issue? I think it is still thread-safe since only one STA owning thread will execute on STA component; 2. How to avoid it in design? thanks in advance, George Tag: Forward Declaration Tag: 290354
  - 16
    - wstring, wofstream, and encodings Hi All, I'm attempting to write a wstring to a file by way of wofstream. I'm getting compression on the stream (I presumed it is UTF-8, but maybe not). How/where do I invoke an alternate constructotor so that the stream stays wide (UTF-16)? This may be broken. wstring ws = L"wide" produces: 77 69 64 65 ('wide' using 7 bit/8 bit ASCII) When I change wstring ws = L"wide" to wstring ws = L"wide \u9aa8" (added the wchar_t for U+9AA8), the file is as follows: 77 69 64 65 6F ('wide' with garbage 6F) Any ideas? Jeff Jeffrey Walton == Sample == wstring ws = L"wide"; wofstream ofs; ofs.open("wide.dat", std::ios::binary | std::ios::trunc ); if( !ofs.good() ) { return; } ofs << ws; ofs.close(); == End Sample == Tag: Forward Declaration Tag: 290343
  - 17
    - Need Information Regarding IM Password in Registry Hi, I m looking to develop some application that could find some Instant messenger saved passwords in Local Machine. I don't know much about the mechanism or encryption schemes for Credentials in System Registry. If somebody could provide me some guidance in this regard I would be thankful. Looking forward to your responses. Regard, CODEJUNKEY Tag: Forward Declaration Tag: 290316
  - 18
    - in-process server considerations Hello everyone, Here is the comments from the book ATL Internals about in-process server considerations, -------------------- Any thread that calls CoGetClassObject or CoCreateInstance must already have joined an apartment, or the call will fail immediately. So, does that mean all objects exposed from in-process servers must be equally at home in single-threaded and multithreaded apartments so that random clients isn't cause harm? Fortunately, no. -------------------- Does it mean COM client (thread) and COM server no need to be the same type of thread model (e.g. STA, MTA, etc.)? thanks in advance, George Tag: Forward Declaration Tag: 290313
  - 19
    - message pump code for COM STA Hello everyone, 1. For message pump code for COM STA, my question is, we just need to copy and past the following code to STA owner thread, no need to implement any functions to handle msg (e.g. hidden window message handler)? (I think no need and I think COM Runtime will plug-in a message handler for the hidden window, to process the msg and call related function automatically?) [Code] MSG msg; while (GetMessage (&msg, 0, 0, 0)) DispatchMessage (&msg); [/Code] 2. If all the message pump code are common, why not COM automatically generates the code for all STA? Because some STA has the requirement of not handling in-coming calls from other apartment? thanks in advance, George Tag: Forward Declaration Tag: 290305
  - 20
    - assign none to COM thread model Hello everyone, As mentioned in the book ATL Internals, when assign none to COM thread model, -------------------- If there is no ThreadingModel given in the registry, COM will assume a legacy single-threaded class and access the class object from the process's first STA, creating a new STA is necessary. This protects objects from having to synchronize access to global, static, or instance data. -------------------- I do not understand why "This protects objects from having to synchronize access to global, static, or instance data"? Any ideas? thanks in advance, George Tag: Forward Declaration Tag: 290299
  - 21
    - Moving projects to the newer version of VC++ I have inherited a lot of projects using VC++ 6, 2002, 2003 and 2005, most of them MFC based (hence cross-posting in 2 newsgroups). I intend to move all of them to 2008 over the time. I already moved some and did have to make some code changes, mostly due to the fact that newer compiler is more strict in conformance to C++ standard. The applications are producing the same result as far as I can see but I haven't performed any extensive testing. What concerns me is that changes in compiler and/or libraries can produce different executable with different behavior, and that difference may not be immediately obvious, however it will break our applications. Can those of you who had to move a lot of projects from one version of VC++ to another share your experiences? How much of a problem it has been? Is there some documentation on MS website related to this issue? Tag: Forward Declaration Tag: 290283
  - 22
    - auto_ptr in loop Hello, I've got a class which wraps a big chunk of memory (image data). The class implements the "+-*/" and "=" operators so I can perform basic image processing on the image data. One of my calculations produces a temporary object in a for-loop. So my idea was to declare an auto_ptr in the loop. But what exactly happens when the execution passes on to the next loop run? for (int j=0; j<kernelZ.KernelSize(); j++) { auto_ptr<Spimage> sumSpimage(*spimages[i+j] * (kernelZ[j] / kernelZ.Sum())); *tempSp += *sumSpimage; // strange dereferencing, because the operators +-*/ are defined for the objects, not for the pointers } Here the auto_ptr's constructor takes the result of a multiplication which is a pointer to a Spimage object (the wrapper). Does the "sumSpimage" auto_ptr destroy the object every run? Thanks in advance for your help, Fabian Tag: Forward Declaration Tag: 290266
  - 23
    - Standard C Library and utf-8 Hello, Does the standard C string library support utf-8 charset basically operations like string length, string compare, string copy, string search? Can I use the C conversion functions like wcstombs and mbstowcs to convert string between wide and utf-8 format? I requires the information for an application that I am developing for Windows CE using Visual Studio 2005. Thanks & Regards, Ajith Tag: Forward Declaration Tag: 290262
  - 24
    - reimplementing another interface,is it possible? Hi, i am not that good at c++ interfaces and classes,so... Here is my situation: for some apis windows wants me to give him a pointer to an interface. (ie implement him an interface) i have another dll that implements this interface and i can get it via a function. is it possible that i use that interface and reimplement one of its functions and send back my new interface to windows?so i can benefit from what has already implemented in that dll and also use my own? I somehow managed to do this,but maybe because i dont know the proper way when freeing interfaces i get errors. (i simply call other interface functions in my interface) For uknown reason the interface refcount i get for the first time from dll is 6. should i also call addref,queary and release of main interface when i do it for myself? thanks Tag: Forward Declaration Tag: 290252
  - 25
    - search engine optimization (SEO) SEO (SEARCH ENGINE OPTIMIZATION) SEO (Search Engine Optimization) is a process of arranging a web site's content to obtain high rankings in various search engines (both the site and individual pages), and includes tailoring on-page text (such as headlines and subtitles) as well as choosing the proper keywords for a page's meta tags. McDaav Systems is a fast growing SEO (Search Engine Optimization) company. We does SEO by using the latest tools available in the field of SEO. Process of SEO in McDaav Systems SEO is the process of increasing the amount of visitors to a Web site by ranking high in the search results of a search engine. The higher a Web site ranks in the results of a search, the greater the chance that that site will be visited by a user. It is common practice for Internet users to not click through pages and pages of search results, so where a site ranks in a search is essential for directing more traffic toward the site. 1. Analysis of the website by interacting with the stake holders, clients. 2. Determination of specific goal of the website and to identify who is the target audience? 3. Analysis and determination of most relevant keywords, targeted keywords,keyword phrases for the business. 4. Interaction with the client for the verification of the most relevant keyword so that it can be used in the website. 5. Through/In depth analysis of the website which includes analysis of site map,site structure, navigation. 6. We create tags, Title tags, ALT tags that target the keywords chosen by the clients. This is done on all the individual pages depending upon the page content. 7. We test the website to see all the applications and web pages are working properly. 8. Submission of the website to various search engines such as Google, MSN, Yahoo etc. and directories "McDaav Systems has launched a new website as Internet Directory. The Internet Directory will accepts links and submissions in various categories such as Arts, Science, Internet, Computer etc. McDaav Systems Directory is one of the fastest growing directory in the world. McDaav Systems provides free static link on webpages having higher pagerank(PR). Directory can be visited at: www.directory.mcdaavsystems.com www.seo-services-india.mcdaavsystems.com www.mcdaavsystems.com Tag: Forward Declaration Tag: 290238
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  - 1
    - how to export global variable in C dll? Hi, I've written a DLL using C (not C++) and I'm trying to export its global variables so that they can be read by client code. I'm having trouble to find documentation about how to do this. My attempts to use 'extern' and/or '__declspec' on the global variables result in linker errors when building my DLL. Will someone please point me to a reference which address global variables in C dlls? Thanks! Tag: Forward Declaration Tag: 290225
  - 2
    - ambiguous access of 'Base' ?? Hello, Sample : class "Derived" derives from Derive1 and from Derive2, and both derive from Base. now, Derived has a function "make2" which does Base(); this results in a compile error : ambiguous access of 'Base' ? This call will call / has to call the constructor of Base. Where is the ambiguity ? When either class 1 or class 2 do not derive from "base", there is no problem anymore. but, the 2 base classes "base" should not have anything to do with the call to Base(); Here is the source: #include <stdio.h> static int _cnt; class Base { //-------------------------------------------------------------------------- public: //-------------------------------------------------------------------------- /// default constructor Base() { printf("%p : %d : %d\n",this,__LINE__,_cnt++); } /// destructor virtual ~Base() { } }; class Derived1 : public Base { //-------------------------------------------------------------------------- public: //-------------------------------------------------------------------------- /// default constructor Derived1() { printf("%p : %d : %d\n",this,__LINE__,_cnt++); } /// destructor virtual ~Derived1() { } }; class Derived2 : public Base { //-------------------------------------------------------------------------- public: //-------------------------------------------------------------------------- /// default constructor Derived2() { printf("%p : %d : %d\n",this,__LINE__,_cnt++); } /// destructor virtual ~Derived2() { } }; class Derived : public Derived1 , public Derived2 { //-------------------------------------------------------------------------- public: //-------------------------------------------------------------------------- /// default constructor Derived() { printf("%p : %d : %d\n",this,__LINE__,_cnt++); } /// destructor virtual ~Derived() { } Base make2(); }; Base Derived::make2() { return Base(); //aa.cpp(81) : error C2385: ambiguous access of 'Base' // unable to recover from previous error(s); stopping compilation } int main(int argc,char *argv[]) { Derived d; printf("------------------\n"); d.make2(); printf("------------------\n"); return 0; } cl -W4 -nologo /J aa.cpp user32.lib when i comment out the ":public Base" at "Derived2" then the code compiles and the result is : 0012FF70 : 12 : 0 0012FF70 : 29 : 1 0012FF74 : 47 : 2 0012FF70 : 66 : 3 ------------------ 0012FF6C : 12 : 4 ------------------ so, as expected, Derived::Derived1::Base has nothing to do with the call to Base(), Base() creates a new item. mario semo Tag: Forward Declaration Tag: 290215
  - 3
    - C or C++ if I need to write C++, I will be forced to learn C automatically? Since I saw many C++ code need to call C library also. Most program use a combination of C++ code and calling C functions. Then writting C++, I cannot avoid learning C right? Tag: Forward Declaration Tag: 290205
  - 4
    - Visual C++ (non-standard C++) Does visual C++ uses a lot of non-standard C/ C++ syntax? for example - 1) near / far seem not standard C++ / standard C typedef DWORD near *PDWORD; typedef DWORD far *LPDWORD; 2) I heard the following is compiler specific _STD_BEGIN _STD_END 3) I heard the following is compiler specific __PURE_APPDOMAIN_GLOBAL extern _CRTDATA2 ostream cout; Tag: Forward Declaration Tag: 290204
  - 5
    - global and static variable in a class delivered in a DLL Hello everyone, If we define global variable and static variable of a class, which are implemented in a DLL. My questions are, 1. All instances of class share the single copy of global variable and static variable of class? If yes, I need to have some synchronization approach on them. 2. Is it safe to use global variable and static (public) variable after DLL unloads? thanks in advance, George Tag: Forward Declaration Tag: 290153
  - 6
    - Is it possible to reposition window's menu bar? Hello, I tried this question in the microsoft.public.win32.programmer.ui, but nobody answered. I hope I'll be more lucky here. I have a requirement to make custom non-client area for main window. I handle the WM_NCPAINT message and draw window frame and window caption correctly. However, window's menu bar cannot be replaced and happens to be under the caption (custom caption is higher than the system one). I tried to make owner-drawn menu following the description from MSDN: "Using Menus" (section "Creating Owner-Drawn Menu Items") http://msdn2.microsoft.com/en-us/library/ms647558.aspx However, I never get a chance to set new position for the menu bar. All I get is the WM_MEASUREITEM message where I can set height and width of an individual menu item. And then the WM_DRAWITEM message where I should draw the item on a given DC. I have no problem to draw the text of menu items at the arbitrary location of non-client area, but I cannot cause it to behave like a menu bar. Handling WM_NCHITTEST and returning HTMENU has no effect whatsoever. Should I handle the WM_NCLBUTTONDOWN message, too? Any other messages? I'll appreciate any advice. Thanks Alex Tag: Forward Declaration Tag: 290146
  - 7
    - Data Type One of the confusion for windows programming is there are so many data type. some of the type are in here http://msdn2.microsoft.com/en-us/library/aa383751.aspx http://msdn2.microsoft.com/en-us/library/323b6b3k(VS.80).aspx is there a complete list of windows data type listing? does standard C++ has that kind of problem - so many data type?? Tag: Forward Declaration Tag: 290130
  - 8
    - reference The prototype of GetExitCodeThread is like this - GetExitCodeThread( __in HANDLE hThread, __out LPDWORD lpExitCode ); ============================= why we put &dwExitCod in the parameter? like - DWORD dwExitCode; GetExitCodeThread( hth2, &dwExitCode ); ============================= digging further i found - typedef DWORD near *PDWORD; typedef DWORD far *LPDWORD; ============================= So DWORD* "equals" LPDWORD ??? then above LPDWORD lpExitCode should be taking parameter of DWORD* lpExitCode (Given DWORD* "equals" LPDWORD) ??? ============================= that's why &dwExitCode ? since &dwExitCode "returns" a pointer to DWORD. Tag: Forward Declaration Tag: 290129
  - 9
    - why CRT has to written in C why CRT for VC++ has to written in C http://msdn2.microsoft.com/en-us/library/59ey50w6%28VS.80%29.aspx is that because CRT is one level above the Win32 API ? Win32 API is the lowest level on API that talk to hardware itself and Win32 is written in C also So it make more sense to write CRT in C too? Tag: Forward Declaration Tag: 290125
  - 10
    - static member why following source file complied with error http://www.oniva.com/upload/1356/ThreadX.cpp http://www.oniva.com/upload/1356/ThreadX.h http://www.oniva.com/upload/1356/Main.cpp 1>d:\c_htp\multithreading\part1listing1\threadx.cpp(15) : error C2724: 'ThreadX::ThreadStaticEntryPoint' : 'static' should not be used on member functions defined at file scope how to fix it? Tag: Forward Declaration Tag: 290120
  - 11
    - HANDLE In visual C++, there is datatype HANDLE void* HANDLE so void* means I can assign any datatype ? like int* string* byte* bool* ... and for HANDLE, is that use only for holding another pointer? like - HANDLE hand = myfunction(); why we need to use HANDLE to hold pointer? can we just define a pointer? Tag: Forward Declaration Tag: 290116
  - 12
    - process.h Is process.h windows specific? I need to use threading by using function like _beginthread _beginthreadex i go to C++ reference web site http://www.cplusplus.com/reference/ but I don't see CRT has the process.h file. Tag: Forward Declaration Tag: 290113
  - 13
    - wprintf() and large exact floats? 2^57 can be (and is) exactly represented as a double. It's value can be correctly assigned to a ULONGLONG. Why doesn't wprintf() print it correctly? Does it just round to 17 significant digits? for ( int i=56; i<58; i++ ) { double z = 1.0; for ( INT j=0; j<i; j++ ) z = 2 * z; ULONGLONG u = z; wprintf(L"i = %d\n" L"2^i = (raw) %I64X\n" L" (double) %.0f\n" L" (ull) %I64u\n", i, *((ULONGLONG*)&z), z, u); wprintf(L"They're %s equal.\n\n", u == z ? L"" : L"not"); } i = 56 2^i = (raw) 4370000000000000 (double) 72057594037927936 (ull) 72057594037927936 They're equal. i = 57 2^i = (raw) 4380000000000000 (double) 144115188075855870 (ull) 144115188075855872 They're equal. -- - Vince Tag: Forward Declaration Tag: 290111
  - 14
    - formatted date string I'm looking to get a 4 char date string from the system time in the form WWYY. This week would be 1408. According to MSDN this should work, except I only get the week (14) and no year: char date_code[]={0,0,0,0,0}; time_t ltime; struct tm *today; time( &ltime ); today = localtime( &ltime ); strftime(date_code,4,"%W%y",today); How come? Thanks drc Tag: Forward Declaration Tag: 290098
  - 15
    - global and static object Hello everyone, This is what mentioned in the book, ATL Internals about why Release function of CComPtr and CComQIPtr is needed for global and static variable. -------------------- The destructor for global and static variable only executes after the main function exits, long after CoUninitialize runs, (That is, if it runs at all. You must link with the C++ runtime library for the constructors and destructors of global and static variable to run.) ATL itself doesn't use the C/C++ runtime library; thus, by default, ATL components don't link with the library. -------------------- I do not quite understand what means "must link with the C++ runtime library for the constructors and destructors ... to run"? Could anyone help please? thanks in advance, George Tag: Forward Declaration Tag: 290083
  - 16
    - =?Big5?B?pf6tu7Tks8zCcUlUIE1hbmFnZXIgaHR0cDovL2VkbXVuZC4wZmVlcy5uZXQv?= =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com =A5=FE=AD=BB=B4=E4=B3=CC=C2qIT Manager http://edmund.0fees.net/ www.funzy.com www.funmobile.com Tag: Forward Declaration Tag: 290082
  - 17
    - replicating default constructor's "non-initializing state" Situation: I have a simple struct that, say, holds a color (R, G, and B). I created my own constructors to ease its creation. As a result, I lose the default constructor. I dislike this, but it's easy to solve: I just make my own default constructor. Problem: My own default constructor is considered to be *initializing the variable* (even though it doesn't), whereas the original one does not. Thus, when I declare and use it before initializing it, the compiler no longer warns me. Question: Are there any compiler settings (even compiler specific ones; I am using MSVC++) that state MY default constructor behaves exactly like the regular default constructor? Thanks for your time, Jason P.S. My default constructor could initialize the variable to all 0's, but this has two unwanted effects: 1. It slows down code in which this initialization needn't occur. 2. It potentially hides bugs that would show up if it were left uninitialized as it should be. (This is similar to how MSVC++'s debugger initializes all variables to 0, which is silly, since it should initialize them to randomness -- as will happen in the release build -- to make bugs appear as quickly as possible). Tag: Forward Declaration Tag: 290048
  - 18
    - Number of strings in an array. The following snippet works because I know that there are three strings in the array. How would one dynamically determine the number of variable length strings in the array? thanks, gtb char* arr[] = {"string1", "string22","string333"}; int i; for(i = 0; i < 3; i++) { printf("\n\n%s", arr[i]); } Tag: Forward Declaration Tag: 290046
  - 19
    - where is _ATL_SIMPLEMAPENTRY defined? Hello everyone, I searched all of my VC folder files, but can not find where and how _ATL_SIMPLEMAPENTRY is defined. Any ideas? thanks in advance, George Tag: Forward Declaration Tag: 290035
  - 20
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  - 21
    - CComMultiThreadModelNoCS Hello everyone, I read the code for class CComMultiThreadModelNoCS of ATL. What means, -------------------- (Section Threading Model Support, Chapter 3 Objects in ATL, ATL Internals) CComMultiThreadModelNoCS is designed for multi-threaded objects the eschew object-level locking in favor of a more fine-grained scehme? -------------------- My understanding is the object designed could use other approaches other than critical section, like mutex/event to do synchronization. Not sure whether my understanding is correct? thanks in advance, George Tag: Forward Declaration Tag: 290020
  - 22
    - ATL bug of CComPtr? Hello everyone, In the ATL Internals book, one form of constructor of CComQIPtr is implemented as this, [Code] CComQIPtr (IUnknown* lp) { p = NULL; if (lp != NULL) lp -> QueryInterface (*piid, (void**)&p); } [/Code] I think there is a bug when QueryInterface fails, and the original value of member variable p is overwritten. I found the in MSVC 2008, the implementation is, [Code] atlcomcli.h CComQIPtr(_In_opt_ IUnknown* lp) throw() { if (lp != NULL) lp->QueryInterface(*piid, (void **)&p); } [/Code] Seems the bug is fixed? Is it a bug in old version of ATL or a bug in the book? :-) thanks in advance, George Tag: Forward Declaration Tag: 290019
  - 23
    - stdarg / vararg question Hi, sprintf allows string formatting based on variable number of arguments. I wish to create my own logging function that takes variable arguments to format a string, and logs it to a file: LogToFile(_T("Param: %u"), 123); Rather than implementing the formatting myself, I wish to use sprintf: int LogToFile(LPCTSTR lpszText, ...) { TCHAR szText[1024]; sprintf(szText, lpszText, ...); FILE *fp = fopen(....); int n = fwrite(szText, sizeof(TCHAR), _tcslen(szText), fp); fclose(fp); return n; } How can I pass the variable argument '...' onto sprintf function??? Lisa Tag: Forward Declaration Tag: 290011
  - 24
    - New Intro to Programing course question. I'm building content for an U/G Intro to programming course meant for a variety of IT students with different majors. I intend to use about 8 assignments that are to be coded in two languages - VB.Net and either VC++.Net or Java. If Java, then I would tend to use Visual J# .net instead of NetBeans since the IDEs are so close. A. Would you, as an experienced developer prefer VB.Net and VC++.Net or VB.Net and Java. B. Would you use VJ#.Net - rember it is an intor course BR Trebor Tag: Forward Declaration Tag: 289984
  - 25
    - COM Interface definition Hi, I am trying to define the interface for interface "IOlkErrorUnknown" documented ONLY at http://msdn2.microsoft.com/en-us/library/aa203932(office.11).aspx I have created the .idl file and the definition looks something like --------------------------------------------------------- [ uuid(797EE151-A04D-11d2-8072-00C04FC986D1), helpstring("Provides extra information about the last error.") ] interface IOlkErrorUnknown: IUnknown { [id(1), helpstring("method GetLastError")] HRESULT GetLastError( [in] HRESULT hr, [out] LPWSTR *ppwszError); }; --------------------------------------------------------- But when compiling I get this error D:\My Documents\Programming\Visual C++\MAPI1\AccountManager.idl(8) : error MIDL2025 : syntax error : expecting a type specification near "HRESULT" D:\My Documents\Programming\Visual C++\MAPI1\AccountManager.idl(8) : error MIDL2026 : cannot recover from earlier syntax errors; aborting compilation --------------------------------------------------------- Please tell me how to resolve the issue. Regards, Ashutosh Tag: Forward Declaration Tag: 289983

Is forward declaration for a class from another project is possible? If so,
how to do?

There are 2 Projects A and B,

I want to forward declare a class of Project B in A, when doing so it says
the class is undefined?

Am i missing out any steps?

Regards,
Alamelu N

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Re: Forward Declaration by Alex

Alex
Tue Apr 15 06:48:15 CDT 2008

"Alamelu" wrote:
> Is forward declaration for a class from another project is
> possible? If so, how to do?
>
> There are 2 Projects A and B,
>
> I want to forward declare a class of Project B in A, when doing
> so it says the class is undefined?
>
> Am i missing out any steps?

If all that you need is to declare a pointer to a class from
project B, then forward declaration is sufficient. However, if you
need to call class' methods, then you must include class' header
file with full definition.

HTH
Alex

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Re: Forward Declaration by Alamelu

Alamelu
Tue Apr 15 07:42:00 CDT 2008

Thanks.

"Alex Blekhman" wrote:

> "Alamelu" wrote:
> > Is forward declaration for a class from another project is
> > possible? If so, how to do?
> >
> > There are 2 Projects A and B,
> >
> > I want to forward declare a class of Project B in A, when doing
> > so it says the class is undefined?
> >
> > Am i missing out any steps?
>
> If all that you need is to declare a pointer to a class from
> project B, then forward declaration is sufficient. However, if you
> need to call class' methods, then you must include class' header
> file with full definition.
>
>
> HTH
> Alex
>
>
>

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