CreateFile fail when opening a printer connected to VISTA

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  - 1
    - Access violation in oleaut32.dll Hello everyone, Our customer experience an access violation error inside the method GetRecordInfoFromTypeInfo (implemented in oleaut32.dll). It doesn't happen every time, but it happens every couple of days. The environment is Windows Server 2003 SP2 32 bits. The version of the oleaut32.dll is 5.2.3790.4202 Has anyone ever encountered this? We can supply a mindump for investigation. Thanks, Ayal Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290587
  - 2
    - About pure virtual function Here I'd like to quote a segment of code from Thinking In C++ (a book writen by Bruce Eckel) to expain my question. class Pet { public: virtual void speak() const = 0; virtual void eat() const = 0; }; class Dog : public Pet { public: void eat() const {} }; int main() { // Dog g; } If I define an object of class Dog and compile it, it must be an error, 'cos I don't define another one in class Dog, but I consider that whether the compiler should tell me what is wrong when I don't define object "d". Because I always feel that the current state of class Dog is like a trap, and it doesn't have any meaning . Am i right? I think it is like a trap, please see this inheritance. class Labrador_Retriever : public Dog { public: void eat() {} }; if I just inherite from base class and I don't define it's object, that means I can't find my error till the very time. I think that's amazing. Thank you for your help Lorry Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290578
  - 3
    - A Windows object named "Instance"... Hello, I have to get and select controls whose the classname is "Edit". They are in a form which is itself a control whose the classname is "Static". These controls are seen by the excellent freeware "Auto It" as follows : Class : Edit Instance : XX ClassNameNN : EditXX As an example : Class : Edit Instance : 01 ClassNameNN : Edit01 Class : Edit Instance : 02 ClassNameNN : Edit02 And my aim is to select each one, using the only criterium that is different between them : this "Instance" or ClassNameNN value. But I don't know which API function can do that, because I don't know which is that "Instance" object... ...??? Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290577
  - 4
    - safe alternative to va_arg Hello, for my error handling I have a class with static method overloads to print error messages (I will probably make this a bit more general with some pattern later). But for the start it is enough to print messages with different numbers of arguments. I don't want to write endless overloads for different numbers of arguments. So my first design looks like this: // header file: class ErrorHandler { public: static inline void PrintError(const char* source, const int& numMsgParams, ...); private: explicit ErrorHandler(){}; }; // cpp file: void ErrorHandler::PrintError(const char* source, const int& numMsgParams, ...) { cerr << source << ": "; if (numMsgParams > 0) { va_list params; va_start(params, numMsgParams); char* addParam = NULL; for (int i=0; i< numMsgParams; i++) { addParam = va_arg(params, char*); cerr << addParam << ", "; } va_end(params); } cerr << endl; } Having to provide the number of arguments to the method call looks pretty error-prone over maintenance time to me. Is there an alternative? Thx for your suggestions, Fabian Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290569
  - 5
    - problem using delphi dll in vc++ hi, I am using a delphi DLL in vc++,static linked with ".h"and "lib". the export functions in DLL are "__stdcall",but the function doesn't work well,it often returns some weird values. when I add codes as follows,it suddenly works well. why?? DWORD returnAdd; __asm { mov ecx,[ebp+4] mov returnAdd, ecx } I am confused,if there is something wrong with stack,I have already using "__stdcall",why it is still wrong? I don't even know what those asm code do,I just add them to get some status about stack.what else they do to the program that I don't know? thank you . Ryan Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290552
  - 6
    - typedef vs inheritance I found in C++ a type is typedef several times and alot of time, I need to dig further to see the original type. like LPDWORD - it's a strange type, but when i dig further, i see it's a (DWORD *) =========== typedef DWORD near *PDWORD; typedef DWORD far *LPDWORD; =========== i feel that creating new type in C++ by using "typedef" is similar to inheritance in Java - where alot of time I need to dig further to found the "PARENT" type of an object hierarchy. Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290548
  - 7
    - return value Is there any way to return either NULL or a SYSTEMTIME object? will it work in C++? as in Java, one can return either NULL or an object, does C++ has something similar? Is the following code OK for C++? ================= SYSTEMTIME Table::Get(char* FieldName) { _variant_t vtValue; vtValue = m_Rec->Fields->GetItem(FieldName)->GetValue(); if (vtValue.vt == VT_NULL) { return NULL; } SYSTEMTIME m_st; VariantTimeToSystemTimeWithMilliseconds (vtValue.date, &m_st); return m_st; } Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290542
  - 8
    - MFC - _beginthreadex why if I have used MFC in my EXE - then I cannot use _beginthread / _beginthreadex? to create a thread? I seem to hear someone said so earlier... Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290541
  - 9
    - return string I have a function like this ============= bool Table::Get(char* FieldName, char* FieldValue) and I call the function like the follow ============= while(!tbl.ISEOF()) { char id2[300]; if(tbl.Get("program",id2)) cout<<"program:"<<id2<<endl; else { tbl.GetErrorErrStr(ErrStr); cout<<"\n"<<ErrStr<<"\n"; break; } } above I passed in a char pointer (char*) - FieldValue and use it just like a return value. but it seem not efficient as each time i initialize a char array of [300] characters. but some string (FieldValue) is only like [5] char. how to I do better for returning string? any example code? ================= should I just return the string in regular return type like - std::string Table::Get(char* FieldName) Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290539
  - 10
    - Is conversion from T* to void*& safe? Hello! Is the following use of reinterpret_cast safe: void f(void*& p); void g(int* p) { f(reinterpret_cast<void*&>(p)); } If my memory serves me right, the standard says that the convertion from T* to void* and back to T* should yield the same pointer value, but I do not remember anything about references to pointers. Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290535
  - 11
    - How should I access _MAX__TIME64_T? Due to a CRT bug, if you pass a value into localtime_s() greater than _MAX__TIME64_T, the program will crash: http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=266036 So, I want to range check my data. But _MAX__TIME64_T is not #defined via #include <ctime>. I have found it only in these files: ...\crt\ctime.h ...\crt\gmtime64.c ...\crt\loctim64.c (Note that <ctime.h> is not the same as <ctime>.) ctime.h is not in the default directories for #includes. Thus, they never intended for it to be available. I could either explicitly #include it, or I could #define it myself: #define _MAX__TIME64_T 0x100000000000i64 What is best? Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290529
  - 12
    - Inadequate error message C2228 Compiling the code #include "stdafx.h" #include <iostream> class A {}; class B { public: B() { std::cout << "Inside B()" << std::endl; b = 0; } B( const A & ) { std::cout << "Inside B( const A & )" << std::endl; b = 1; } B( const B & ) { std::cout << "Inside B( const B & )" << std::endl; b = 2; } int get_b() const { return b; } private: int b; }; int _tmain(int argc, _TCHAR* argv[]) { B b(B( a )); std::cout << "b.b = " << b.get_b() << std::endl; return 0; } I got a strange error message error C2228: left of '.get_b' must have class/struct/union. What is wrong? Vladimir Grigoriev Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290515
  - 13
    - sizeof() struct w/ nested enum returns wrong size I have the following situation compiling using Visual Studio 2003: #include "stdafx.h" #include <iostream> #include <limits> namespace Outer{ class Xyz { public: typedef struct { enum { classConstant1 = 0x0001, classConstant2 = 0x0002, ForceSize2Bytes = 0x7FFF }; // end enum } Constants; // end struct }; // end class Xyz } // end namespace Outer int _tmain(int argc, _TCHAR* argv[]) { std::cout << "The sizeof() Outer::Xyz::Constants = " << sizeof(Outer::Xyz::Constants) << std::endl; std::cout << "Outer::Xyz::Constants::ForceSize2Bytes = 0x" << std::hex << Outer::Xyz::Constants::ForceSize2Bytes << std::endl; std::cin.ignore((std::numeric_limits<std::streamsize>::max()), '\n'); return 0; } // end main() Here's the output: The sizeof() Outer::Xyz::Constants = 1 Outer::Xyz::Constants::ForceSize2Bytes = 0x7fff The struct size is reported as one while the cosntants clearly output a 2 byte value. Does anyone knwo what's going one? Thanks, HJS Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290511
  - 14
    - replacing sprintf_s in macro for compiler compatibility Hello, I will have to build my application with a different compiler at some point. The secure functions like sprintf_s are a nice feature of the visual c++ compiler. But they will probably not be supported on the target platform. If I had the possibility to #define a macro which uses sprintf_s if the visual c++ compiler is used and uses the standard sprintf if a different compiler is used I would not have to switch off the deprecated warnings. Can I define a macro with optional arguments as sprintf resp. sprintf_s use? Thanks for your suggestions, Fabian Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290504
  - 15
    - Prologue/Epilogue for SEH I wonder if anyone here might know a bit more about structured exception handling (SEH) with VC++ than the Microsoft documentation provides. When the SEH function prologue is: push regs allocate stack space the required epilogue form is: add rsp, stack_space_amount pop regs ret or a similar form using LEA. The documentation implies that when the prologue is: push regs the epilogue has to be: add rsp, 0 pop regs ret Is this zero addition to rsp needed here? The Microsoft documentation implies that it is necessary but it doesn't explicitely say so. I would be most grateful if anyone here is able to clarify this. Brian Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290503
  - 16
    - The C++ standard's rule for selecting a constructor Visual C++ 2003 EE is used. The program that follows #include "stdafx.h" #include <iostream> #pragma hdrstop #include <conio.h> class A {}; class B { public: B() { std::cout << "Inside B()" << std::endl; b = 0; } B( const A & ) { std::cout << "Inside B( const A & )" << std::endl; b = 1; } B( const B & ) { std::cout << "Inside B( const B & )" << std::endl; b = 2; } int get_b() const { return b; } private: int b; }; int _tmain(int argc, _TCHAR* argv[]) { A a; B b1( a ); std::cout << "b1.b = " << b1.get_b() << std::endl; B b2 = a; std::cout << "b2.b = " << b2.get_b() << std::endl; B b3 = B( a ); std::cout << "b3.b = " << b3.get_b() << std::endl; return EXIT_SUCCESS; } gives the result Inside B( const A & ) b1.b = 1 Inside B( const A & ) b2.b = 1 Inside B( const A & ) b3.b = 1 Press any key to continue . . . Is it a bug that b3.b = 1? I guessed that b3.b must be equal to 2. If the copy constructor will be declared as private then the error error C2248: 'B::B' : cannot access private member declared in class 'B' will be issued for the statement B b3 = B( a ); O'k. However what constructor must be called for the statement B b2 = a; ? If the keyword explicit will be placed before B( const A & ) the error error C2440: 'initializing' : cannot convert from 'A' to 'B' will be issued for the statement B b2 = a; Vladimir Grigoriev Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290480
  - 17
    - Multiple initialization of template static data members? Hello, I just found out that in VC 2005 one can have multiple initializations of template static data members: // File1.cpp template<typename T> struct C { static int const c; }; template<> int const C<int>::c = 0; int main() { } // File2.cpp template<typename T> struct C { static int const c; }; template<> int const C<int>::c = 1; Does this behaviour comply with the standard? Angel Tsankov Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290478
  - 18
    - Advice on Search Engine Optimization How many of you out there have an amazing system that you are using for search engine optimization? Please share your strategies to the group. YOu guys have got to check this FREE video out where Frank Kern of Mass Control, which is one of the biggest internet marketing launches in history, grills SEO expert Nancy Andrews and gets her to reveal her top secret strategies for top ranking sites! Please go there and see this--the response so far is unbelievable!! ===========================================================================================Christina Lang-LiveBluePrints Discover The Live SEO Blueprint that Lets Anyone Outwit, Outmaneuver and Beat the Big Dogs for Top Google Positionshttp://www.liveblueprints.com/156.html Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290477
  - 19
    - Distributing msvcrt.dll Hello. I have developed an app on Windows 2000 with Vc++ 6 (service pack 5). The app needs msvcrt.dll, which on my development machine is "6.1.9844.0". (If Im not mistaken windows 95 is the only version of windows which doesnt ship with msvcrt.dll in the system32 folder..can anybody confirm this?) Im not sure whats the best strategy for (not) distributing msvcrt.dll. Should I always install the msvcrt.dll from my devlopment machine into my apps folder on the user's machine? Should I only do it if the user has an older (or no) version in his system32 folder (or %PATH%). Or should I distribute the newest version of the dll (presumably that which ships with vista or xp)? If I do copy msvcrt.dll into my apps folder, will that version always be used by my app? On Windows Xp/Vista my app crashes unexpectedly if I put the msvcrt.dll into the same folder as my app's exe. Everything seems fine if I dont (so that my app instead uses the version from windows' system32 dir). Are such crashes to be expected, if is using the msvcrt.dll from win 2000 machine? And are newer versions always better, or are the versions which ship from microsoft with each os the most appropriate (in whihc case what to do with win 95)? Thanks very much in Advance. Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290470
  - 20
    - Transfer the Bitmap accross applications Hi , i have two different applications, like App1 and App2. Each application has one dialog like App1Dailog1 & App2Dailog2, my task is to transfer the bit map from one application to another application dialog. means when sending the bitmap file from one app1 to other app2 then app2 dialog has updated wtih app1 bitmap file. all this done by command line arguaments as below App1.exe App2.exe c:\bitmapfileName.bmp then App2.exe file dialog has updated with this bitmap file c: \bitmapfileName.bmp thanks in advance Rasheed. Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290463
  - 21
    - Including header file There are 2 projects, Project A and Project B. I want to include a header file from Project B into project A. Project B is dependent on Project A. When including the header file of project B into A, i get the below mentioned error. D:\AInterfaces.h(490): error C2143: syntax error : missing ';' before 'string' D:\AInterfaces.h(490): fatal error C1075: end of file found before the left brace '{' at 'D:\AInterfaces.h(35)' was matched What causes this error? How do we resolve it? Regards, Alamelu N Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290457
  - 22
    - Forward Declaration 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 Tag: CreateFile fail when opening a printer connected to VISTA Tag: 290455
  - 23
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290449
  - 24
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290433
  - 25
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290431
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  - 1
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290424
  - 2
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290420
  - 3
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290415
  - 4
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290408
  - 5
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290405
  - 6
    - #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: CreateFile fail when opening a printer connected to VISTA Tag: 290393
  - 7
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290386
  - 8
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290383
  - 9
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290381
  - 10
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290379
  - 11
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290355
  - 12
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290354
  - 13
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290343
  - 14
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290316
  - 15
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290313
  - 16
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290305
  - 17
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290299
  - 18
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290283
  - 19
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290266
  - 20
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290262
  - 21
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290252
  - 22
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290238
  - 23
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290225
  - 24
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290215
  - 25
    - 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: CreateFile fail when opening a printer connected to VISTA Tag: 290205

I have issues with Createfile() in Vista.
In my code, I am trying to open aprinter share(\\vista_ip_addr\print_share)
with Creatfile() and OPEN_EXISTING as one of the parameter. Eventhough the
share exists, CreateFile always fails saying file not found.

It is working fine if I use OPEN_ALWAYS instead of OPEN_EXISTING. But it
Interestingly, the same code works in other OS (printingremotely using
\\vistamac_ip_addr\print_share). Adding the manifest didn't work either.

Any thoughts on this?

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