File writing in VC++6.0

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  - 1
    - Invoke throws an exception with VC8 ported code... thanks again for reply.. This is how my CreateFinish looks like... void Fire_CreateFinish() { T* pT = (T*) this ; pT->Lock(); IUnknown** pp = m_vec.begin(); while (pp < m_vec.end()) { if (*pp != NULL) { DISPPARAMS disp = { NULL, NULL, 0, 0 }; IDispatch* pDispatch = reinterpret_cast <IDispatch*>(*pp); pDispatch->Invoke(0x1, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, &disp, NULL,NULL, NULL); } pp++; } pT->Unlock(); } Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 2
    - GetDC() call One more thing, sometimes that pointer becomes invalid.. :-D Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 3
    - MFC VC++ - Passing a VC++ Data Structure into a C# Sharp DLL function from MFC VC++ Hi All, Could somebody please point me in the right direction. I want to be able to pass a data structure from my VC++ code into a C# DLL which contains SQL functions and Classes. The C# code will populate the data and return to the calling VC++ function. Does anybody have any simple examples or information I have ready loads of information for passing from C# to VC++ and have no issues with this. Regards Gary. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 4
    - keeping global variables alive in xll i have a global pointer, in a function i malloced some memory for that pointer. then in another function i access that memory but its not there. is there something regarding multithreading that i should be concerned about. is there something i am overlooking thanks Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 5
    - Question on including header files to project in VC++ Thanks for your prompt reply Prasad but I am sorry I still don't get it. Is there any advantage of adding a header file to the project using "Add files to Project" option. I can add include directories etc to the Project and it works fine but if I just add the header file to the project and dont add its path to the include directories , it doesnt work. So, I am just trying to understand the implication/purpose of adding a header file to a project. Thanks, KarthikR Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 6
    - #include <windows.h> Meh, reminds me of my current fun with tryig to get the April update to the MSDN library. I've downloaded it 5 times so far and it has been corrupt. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 7
    - _wstat64i32 undefined Thanks guys. That fixed the problem. Its a bit confusing in the MSDN help, or to put it another way its not as clear as mud. Look at the function declaration that's provided there. "_stat" is both a function and a structure. I didn't notice this until you guys pointed it out. int _stat( const char * path , struct _stat * buffer ); It becomes obvious further down in the MSDN help. int _wstat( const wchar_t * path , struct _stat * buffer ); Anyways, I'm very happy now because this was the LAST compile bug I had, and your help let me finally compile my code! Attention to detail is a valuable timesaving skill. ML Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 8
    - IExplorer headers catching Hi, all. Does anyone know, how to catch headers of my request, using IE Event model Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 9
    - Syntax to use pin_ptr on a multi-dimensional array? Hi, I'm trying to wrap a native function with the following parameter: nfunction(long Ustart[][2]) The corresponding wrapper function has the following signature: wfunction(array<long, 2> ustart) { // use pin_ptr to "convert" the manage array to native array // call nfunction() with the "native array" } I know how to use pin_ptr<> for single dimensional arrays but how do I use it in this case Thanks for any help! Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 10
    - Mixed Mode : Should definitions be in the headers when creating static mixed lib? Hi, I found an elegant solution for my problem. (Thanks to Nishant's Book !) This solution will reduce the overhead of forcing C++/CLI syntax when native developers are trying to use my classes as well. Still memory management is a big topic, I think I have to study further before delving in. Thank you, -- Sunkyu // ============ LIB HEADER ====================== #include <string> #include <msclr\auto_gcroot.h> namespace Minerva { namespace MixMode { class MixMe { protected: msclr::auto_gcroot<System::Xml::XmlDocument^> _doc; public: MixMe(const std:: string& fileName); virtual ~MixMe(); }; } } // ============ LIB SOURCE ====================== #include "MixMe.h" using namespace Minerva::MixMode; using namespace System::Xml; MixMe::MixMe(const std:: string& fileName) { _doc = gcnew XmlDocument(); } MixMe::~MixMe() {} // ============ APP CODE ====================== #include "MixMe.h" #include <stdio.h> using namespace Minerva::MixMode; int main(int argc, char* argv[]) { MixMe* mix = new MixMe("Hello, world"); delete mix; return 0; } Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 11
    - Error with map<string, vector<vector<string> > > I've a problem with this code: #include <iostream> #include <vector> #include <map> #include <string> using namespace std; int _tmain( int argc, _TCHAR* argv[]) { vector<string> vs; vs.push_back( "Hello" ); vector<vector<string> > vvs; vvs.push_back(vs); map<string, vector<vector<string> > > m; m[ "key" ] = vvs; // error return 0; } The compiler doesn't show errors, but when I execute it in debugging I see that m contains an error message. Does somebody know where the problem Thank you Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 12
    - Windows forms help It is still eluding me. i tried what you said to do. i even tried itin a new project to check it wasn't somthing i had inadvertantly changed that was causeing the problem. Here is the new project: There are 2 classes c1 and c2. //Form1.h #pragma once namespace example { using namespace System; using namespace System::ComponentModel; using namespace System::Collections; using namespace System::Windows::Forms; using namespace System::Data; using namespace System::Drawing; /// <summary> /// Summary for Form1 /// /// WARNING: If you change the name of this class, you will need to change the /// 'Resource File Name' property for the managed resource compiler tool /// associated with all .resx files this class depends on. Otherwise, /// the designers will not be able to interact properly with localized /// resources associated with this form. /// </summary> public ref class Form1 : public System::Windows::Forms::Form { public : Form1( void ) { InitializeComponent(); // //TODO: Add the constructor code here // } protected : /// <summary> /// Clean up any resources being used. /// </summary> ~Form1() { if (components) { delete components; } } private : System::Windows::Forms::Label^ label1; private : System::Windows::Forms::Button^ button1; protected : private : /// <summary> /// Required designer variable. /// </summary> System::ComponentModel::Container ^components; #pragma region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> void InitializeComponent( void ) { this ->label1 = ( gcnew System::Windows::Forms::Label()); this ->button1 = ( gcnew System::Windows::Forms::Button()); this ->SuspendLayout(); // // label1 // this ->label1->AutoSize = true ; this ->label1->Location = System::Drawing::Point(61, 39); this ->label1->Name = L "label1" ; this ->label1->Size = System::Drawing::Size(35, 13); this ->label1->TabIndex = 0; this ->label1->Text = L "label1" ; // // button1 // this ->button1->Location = System::Drawing::Point(129, 37); this ->button1->Name = L "button1" ; this ->button1->Size = System::Drawing::Size(80, 48); this ->button1->TabIndex = 1; this ->button1->Text = L "button1" ; this ->button1->UseVisualStyleBackColor = true ; // // Form1 // this ->AutoScaleDimensions = System::Drawing::SizeF(6, 13); this ->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font; this ->ClientSize = System::Drawing::Size(284, 264); this ->Controls->Add( this ->button1); this ->Controls->Add( this ->label1); this ->Name = L "Form1" ; this ->Text = L "Form1" ; this ->ResumeLayout( false ); this ->PerformLayout(); } #pragma endregion }; } ///c1.cpp #include "StdAfx.h" #include "Form1.h" #include "c2.h" #include "c1.h" c1::c1( void ) { } c1::function( void ) { c2_->example=2; ///why does this work f1->label1->Text= "hello" ; //whereas this does not As far as i can see the code is exactly the same. } c1::~c1( void ) { } ///c1.h #pragma once class c2; class Form1; class c1 { public : c1( void ); Form1* f1; c2* c2_; int function( void ); public : ~c1( void ); }; ///c2.cpp #include "StdAfx.h" #include "c2.h" c2::c2( void ) { } c2::~c2( void ) { } ///c2.h #pragma once class c2 { public : c2( void ); int example; public : ~c2( void ); }; Here are the errors generated: 1>------ Build started: Project: example, Configuration: Debug Win32 ------ 1>Compiling... 1>c1.cpp 1>.\c1.cpp(11) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>.\c1.cpp(13) : error C2027: use of undefined type 'Form1' 1> c:\users\lutzee\documents\visual studio 2005\projects\example\example\c1.h(3) : see declaration of 'Form1' 1>.\c1.cpp(13) : error C2227: left of '->label1' must point to class/struct/union/generic type 1>.\c1.cpp(13) : error C2227: left of '->Text' must point to class/struct/union/generic type 1>Build log was saved at "file://c:\Users\Lutzee\Documents\Visual Studio 2005\Projects\example\example\Debug\BuildLog.htm" 1>example - 4 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== Thanks very much for you r help :) Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 13
    - the system cannot find the file specified...error 2 Simple Samples wrote: CheckRevision wrote: #include <windows> try without the ".h" :) You are guessing. You should at least say you are guessing. Better yet, it is very easy to verify if that is correct. I was using VC++ 6.0 and it works with <windows> Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 14
    - spy++ doesn't monitor reflected messages (OCM_*)? nobugz wrote: Check out Winspector . I used an earlier version that crashed about half the time. I assume the latest version is more stable. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 15
    - Runtime libraries As far as I know, DLLs and the using exe can have different runtime libraries. Think of it this way. If we are required to have the same runtime library linking, then software would have to specify what linking they require. And if we use more than one libraries in an application, we could have an impossible combination of libraries. If the problems with new and delete are the result of use of the library, then the documentation should explain how to avoid the problems. There are potential problems such as described in Potential Errors Passing CRT Objects Across DLL Boundaries , but as I say, if anything such as that applies, then the other software's documentation should say so. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 16
    - Compiler directive to allow use of deprecated items? Hello, Is anyone aware of a compiler directive that will allow me to use deprecated items Regards, Peter Tag: Visual C++ General File writing in VC++6.0 Visual C++
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  - 1
    - How do I compile c++ code into a EXE file Snake_122 wrote: I am new with MS Visual Studio, a beginer if you will, I hope somebody can help me with this problem, I need to know how to make regular c++ without the visual part, code into an EXE file You should have a batch file such as "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat", which initializes all environment variables you need to compile your source file(s) such as Bite Qiu proposes. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 2
    - CFileDialog As you can see, the OFN_ENABLEHOOK is currently disabled in the code I provided to you. Anyhow: 1. this flag is inserted automatically by the CFileDialog contructor (I read the source code) 2. DoModal asserts if this flag is not used 3. I am not trying to use any special hook - just the default provided by MFC, which works fine with File | Open. My code is in fact almost a replica of the code that the framework uses when it processes OnFileOpen (again, I read the MFC source code) Thanks. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 3
    - textBox - 2 questions I was doing that, but after you have a lot of data it takes time to refresh becaus if I use textBox1->text = "ybla" + textBox1->text; It filles each time the text box... How about my second question Anyone ! Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 4
    - Printing strings of TCHAR[] into a file Hi, I'm having difficulty printing strings of TCHAR[] arrays into a file using CreateFile & WriteFile. When I try to write TEXT("1234567") to a file using WriteFile, the result looks like this in the file when opened with notepad or wordpad: 1 2 3 4 5 6 7 There is a space between every character, which makes sense since I'm using UNICODE character sets, but I don't want it to look like this when I'm writing to a file, is there a way to convert between the two character sets I've been trying to come up with a snippet of code to convert TCHAR into char, but no luck so far as the VC++ won't let me declare a variable length array and won't let me access TCHAR[] array by index. For example, I get a run-time error saying that "Access violation writing location" when I do this: myConvertFunction(TCHAR * str, int lengthOfStr) { char tempStr[lengthOfStr]; // <--------- this causes a compiler error str[1] = str[2]; //<-------------this causes a run-time Access violation error } Does anyone have any ideas for me I just want to be able to print TCHAR in UNICODE set properly into a file so that when viewed in wordpad or notepad that there are not spaces between all the characters. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 5
    - Is it just me? Deleting handlers and functions w/VC2005 impossible My comments are too general Ok, I'll be specific, I thought I was. Open a formview app, or Dialog applciation in VC2005. Add a button...call it "Test" and give it a resource ID of ID_TEST Double Click the button and you can add a handler for it. VC2005 adds a functions called OnTest() where you can now add code. Now, this was just a test. My testing is done. I want to delete this button, the function and all remnants that it ever existed so my app is clean again. Or maybe I want to call it a different name, so I'll create a new one with a better name, copy my code and now I want to get rid of the old one. HOW DO YOU DO THAT I could do it with VC6 through the ClassWizard by selecting OnTest() and hitting the <del> key, or right-clicking and selecting delete from the popup menu. I've looked through the MSDN documentation, I've googled it, been a longtime member of ProgrammersHaven, CodeGuru and CodeProject and I haven't been able to figure out how to do this. If I sound frustrated it's because I've spent a good bit of time trying to figure it out and haven't found anything and since this is such a simple basic need (after all, if you can ADD something, shouldn't you be able to just as easily DELETE something ). Yes, I have gone through and deleted code by hand, and I hope I got all the references, but with the various entries VC2005 puts in Intellisense, browser files, resource files, message maps, etc. it's very difficult to know if I got it all. So if you want specifics then there it is. If you know what page of the VC2005 documentation that is on, I'm all eyes. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 6
    - Is it possible to have dialogs in a DLL created using VC++ 6.0 I tried to create a new class for a dialog box. Even I deleted CModeless.cpp and CModeless.h from worksapace and containing folder, I am recieving --------------------------- Microsoft Visual C++ --------------------------- Unable to open the files (D:\MyFolder\example\Dlg\Modeless.h, D:\MyFolder\example\Dlg\Modeless.cpp) for class "CModeless". --------------------------- OK --------------------------- "--------------------------- Microsoft Visual C++ --------------------------- The files (Modeless.h, Modeless.cpp) for the new class "CModeless" contain remnants of that class. --------------------------- OK --------------------------- Errors. And when I compile and build, it is not recognising CModeless class. Please help me to rectify this. I need to export this Modelless dialog. Thank you Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 7
    - Exception from Invoke method I'm getting the message "NULLReferenceException: Object reference not set to an instance of an object" when executing the following: if ( this ->mycontrol->InvokeRequired == true ) { this -> mycontrol -> Invoke ( gcnew MethodInvoker ( this ,&myForm::controlDelegate)); } The exception refers to the line that calls the Invoke method. This does not happen consistently . Most of the time there is no exception. Any suggestions Thanks. Paul Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 8
    - Static and dyanamic linking How do i create DLL and what is the difference between Static and dyanamic linking Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 9
    - CHttpFile::SendRequest() hangs Hi all, I am using CInternetSession, CHttpConnection and CHttpFile classes to fetch the asp page. The code seems to run fine for the first time, but it hangs on the second call. here is the code i wrote:- Internet session is initialized in the constructor:- m_pSession = new CInternetSession("CHttpHelper"); CHttpConnection* pServer = NULL; CHttpFile* pFile = NULL; CString server; CString object; INTERNET_PORT port; DWORD a; DWORD dwRet; DWORD dwHttpRequestFlags =INTERNET_FLAG_DONT_CACHE; CString Page; char Buffer[512]; AfxParseURL(url, a, server, object, port); pServer = m_pSession->GetHttpConnection(server, port); pFile = pServer->OpenRequest( CHttpConnection::HTTP_VERB_GET, object, NULL, 1, NULL, NULL, dwHttpRequestFlags); if (pFile != NULL) { pFile->SendRequest(); pFile->QueryInfoStatusCode(dwRet); if (dwRet == HTTP_STATUS_OK) { int nCount = 1; while (nCount > 0) { // Read the Page in a String nCount = pFile->Read(Buffer, 511); if (nCount > 0) { Buffer[nCount] = 0; Page += Buffer; } } } } if (pFile != NULL) { pFile->Close(); delete (pFile); pFile=NULL; } if (pServer != NULL) { pServer->Close(); delete (pServer); pServer=NULL; } Thanks in advance. Note:- 1. The code runs fine when i add an AfxMessageBox("Run"); before pFile->SendRequest(). 2. It works fine with local asp page. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 10
    - check for process availability using process-id Hi, I have a problem to check for process availability in a CRT based application. I'm using: pid = _spawnlp (_P_NOWAIT, cmd, buf->data, NULL) to start a background process and need help to check if the initialisation of the process fails. _spawnlp allready return an error if something happen during startup like cmd is missing but i want to wait for ~ 0.1 sec and just check for the pid still exists. the problem is that _cwait is blocking until the process is finished. under unix I'm using: waitpid (pid, NULL, WNOHANG) with: WNOHANG The waitpid() function will not suspend exe- cution of the calling process if status is not immediately available for one of the child processes specified by pid. how can I check I the process still exists with only the pid as argument -> thanks for help mfg Andreas Otto Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 11
    - how to GET a binary file using winsock 2 The first time you recv(), you must have received 48byte data, and you truncated it to 8byte(0x47 - 0x6e) by using strlen(). The second time you recv(), you must have received 128byte data, and you truncated it to 3byte(0x94 - 0x18). And I guess the seventeenth byte you have received is 0x96. My suggesting is, use return value of recv() (not strlen()!) to determine your data length. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 12
    - c++ debug: STATUS_DLL_NOT_FOUND Hi, I am learning openGL and was trying to write code to display a simple openGL window. I included 'glut.h' in my code but when I run the code (F5), no window is displayed. The output says: Debugger:: An unhandled non-continuable STATUS_DLL_NOT_FOUND exception was thrown during process load The program '[1372] 2.exe: Native' has exited with code -1073741515 (0xc0000135). The platform is VS .Net2003. Can anyone help Thanks a lot! Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 13
    - Obtaining a memory address of a variable returned by a class member function Hello, I'm having some syntax difficulties. I want to set a pointer to point to a variable like this (CTREEITEM is HTREEITEM* , and GetSelectedItem() returns a HTREEITEM) : Code Snippet CTREEITEM = &pCtrl->GetSelectedItem(); In the past, I've done something similar: Code Snippet pCtrl = &this->GetTreeCtrl(); That worked as expected, but now I'm getting the compile-time error message "C2102: '&' requires l-value". I'm at a loss as to what to do. Please advise. Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 14
    - File Handler not working Howler72, Read my post above, you need to remove spaces in directory and file name initialization varibles. Your code, char userDirectory [40]= " " ;//<- remove this breakspace. char fileName [40]= " " ;//<- remove this breakspace. char dirAndFile [100]= " " ;//<- remove this breakspace. My code, char userDirectory [MAX_PATH]= "" ; // <- empty string, without a breakspace. char fileName [MAX_PATH]= "" ;// <- empty string, without a breakspace. char dirAndFile [MAX_PATH]= "" ;// <- empty string, without a breakspace. And everything will work greatly. Or almost greatly if you close handle, and check the returning values. :-) Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 15
    - Makefile project linking broken in Visual Studio 2005? In Visual Studio 2003 and earlier, you could make Visual Studio projects link against the output of a makefile project by setting the Output line. In VS2005 this seems to be broken. Is there something you have to do to get this to work One of the projects I have run into has a work around for this issue by making a separate library project with no files in it, that depends on the makefile project. To get the output of the makefile project to link in, it adds the output of the makefile project to the "Additional Dependencies" line in the separate empty library project. Any upstream libraries then need to depend on the empty library project instead of the makefile project. But this means you have to author 2 project files for every external library. Is there a better way to do this in VS2005 Tag: Visual C++ General File writing in VC++6.0 Visual C++
  - 16
    - whats problem with this code? msvs2005 Well, the code generators I've worked on (one of them trying to be highly compatible to VC on the ABI level while heavily optimized for performance for their own set of processors) used different intrinsics for compiler-generated initialization. Oc, VC doesn't ship with a stripped down version with just the compiler support code but other compilers do. But that code, also has the additional benefit of signaling required alignment to the codegen, which allows it use just a plain rep stosd without having to account for additional alignment on either side. While VC's optimization isn't really strong at the microlevel it's probably still smart enough to figure out that an inlined rep stosd is a much better choice than calling a plain dumb memset here. I don't quite get your argument about the size of the structure. It certainly is large enough to warrant using a loop-construct and certainly too small for vectorized execution to amortize set up costs. So, in conclusion, I actually believe it does make a difference for a decent codegen (and I'd even bet VC 7.1+ would be good enough here, too). But then, I don't have access to a copy right now. -hg Tag: Visual C++ General File writing in VC++6.0 Visual C++

krishnasamy

I have written a code in my Exe as follows,

FILE *fp;

fp=fopen("image.jpg","wb");

fwrite(pVFData,Size,1,fp);

fclose(fp);

The above code is working properly and i have displaying the image in image.jpg.

The same code in DLL is not working properly. There is image.jpg file creating only not displaying the image.

What is the reason

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Re: Visual C++ General File writing in VC++6.0

Ramkrishna Pawar

Are you sure that the data you passed to fwrite was correct image data

Verify if the data in written file is same as what you wanted to write, you can open the image as binary file in editor like utraedit (VC++ will do too).

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