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My program now has no memory leaks. I thought since there were memory leaks for a while, the memory on my computer might need attention; l; like go delete the huge amounts of variables I left un-deleted.
No?
Are you saying once I fix my program from memory leaks that there are no lasting problems with the computer?
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assertfailed wrote: I thought since there were memory leaks for a while, the memory on my computer might need attention;
Not if your program has since been shut down.
assertfailed wrote: Are you saying once I fix my program from memory leaks that there are no lasting problems with the computer?
That is correct.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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The memory that "leaked" is the address space of the program you are running. What happens to long running programs is that they lose track, i.e. leak, allocated memory so they grow over time, eventually running out of memory (virtual address space). At that time, malloc(), new, or other such calls that request more memory fail and the program will probably start misbehaving.
However, when you stop the program, kill it with task manager, click the big "X" to close the window, or other such ways to stop programs in Windows (or Linux or whatever), the program is removed from physical memory and all that "lost" memory is given back.
The Operating System (Windows, Linux, etc) never really loses track of the memory, only the program running does. All is recovered when the program dies (in natural or unnatural ways).
Back in the '60s, we used to say that certain operations (like right or left shifts) dropped the discarded bits in the "bit bucket". We'd tell Computer Science 1 students that the bit bucket needed to be periodically emptied  Same thing here, we don't need to go back and mop up the leaks 
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you should go have a beer. your work is done!
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Sorry to contradict those other nice folk, but your job is *not* done!
You might be leaking GDI objects too!
Ie, pens, brushes, DCs, and so on. And they're harder to track down...
I have no idea what framework you're using. With pure win32, you need to be nice and careful. With MFC, most of the work of grabbing and releasing is done for you, but you can still mess up.
Iain.
I am one of "those foreigners coming over here and stealing our jobs". Yay me!
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how can convert BSTR to DWORD ?
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Have you searched the internet? Sounds way too trivial to me.
"Real men drive manual transmission" - Rajesh.
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i didnt find about this, just from DWORD to BSTR !!
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Just pass the BSTR like any other string object or character array to atoi() or _tstoi() and cast the returned value to a DWORD.
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It's a delayed answer, but there are two answers:
1) A BSTR is just a pointer, so you can just treat that as a big fat integer. Be careful of 32bit vs 64 bit compiles though.
2) A BSTR is a way of representing a string (it's a counted string), and as such depends on what the string is.
Do you mean the number in the string? "1234" -> 1234?
In which case scanf and friends.
What about "apple" ? Is that 0?
Iain.
I am one of "those foreigners coming over here and stealing our jobs". Yay me!
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hi all,
please can anybody help me
6F00 return on reading of smard card.
i dont know how can i solve out please help me for this.
thanks.
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How can anyone answer this? We have no idea what sort of card you are using, what interface it is connected to and what code you are using to access it. Please give some useful information about your problem.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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while reading a smart card according to GSM standard its return 9000 at the end of response string ,as a normal ending of the command,
but for device its reaturn 6f00 so no data is fetched here.
thanks.
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And exactly what is that supposed to tell us? Try reading the documentation to find out what 6F00 indicates.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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Hi Guys!
Nowadays i am appearing for interviews with expertise in COM+/DCOM/Web-services.
I have done little work in MFC may be close to 8 months for a maintenance project.
During interviews interviewers are more focused in MFC rather than my core expertise,now i am planning to learn MFC as well...
I have been asked about many macros in the interviews..
I have following question:
1)Do i need learn about all or most of the important classes..?
2)Do i need to know all the Macros..?
3)how about win32..?
what else i should learn in this...
what you guys would advise me in this ???
i bought a MFC book "MFC Programming from the ground up"
Please help and Thanks in advance.
vikas da
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tasumisra wrote: 1)Do i need learn about all or most of the important classes..?
The scope of this question is quite wide and the answer would be "Yes" and a "No". Basically the interviewers try to understand your in depth knowledge about MFC. A few classes like CObject,CArchive(helps in Serialization), CCmdTarget (foundation class for message map architecture), CWinThread etc would help. The questions put in front of you might depend on the project requirement.
tasumisra wrote: 2)Do i need to know all the Macros..?
Expected is "yes". But it seems hard to gather the knowledge on everything. BEGIN_MESSAGE_MAP etc should be known.
tasumisra wrote: 3)how about win32..?
Win32 is the base for MFC as it is built on top of it. Read Windows Internals to understand how things work.
Many people would also suggest to have a little or more knowledge of everything in MFC. But the crux is "The more you code, the better you become in terms of knowledge, understanding and preparation"
You talk about Being HUMAN. I have it in my name
AnsHUMAN
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I have attended a lot of interviews for VC++ and MFC Requirements. it depends from person to person. You certainly need to know the basics of MFC, and win32. You would not have used all the macros that is available in MFC. So what you know can be explained to them really well so that they can get convinced that you have reall y worked on them or have knowledge on it...
You can get a job by learning a lot of things but what really matters is the practical experience. I wish you all the best for your interviews.
Every new day is another chance to change your life.
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Thank you so much AnsHUMAN and Chandra..
I guess i need to work hard for MFC...
vikas da
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Your Welcome 
Every new day is another chance to change your life.
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Hi everybody. I have a question regarding adding a method to premade code using visual c++. Here is the method:
void GetAllFiles( string sPath )
{
WIN32_FIND_DATA FindFileData;
string sTmpPath = sPath;
sTmpPath += "\\*.*";
HANDLE hFind = FindFirstFile( sTmpPath.c_str(), &FindFileData );
if ( hFind == INVALID_HANDLE_VALUE )
return;
else {
do {
if ( ( FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) ) {
if ( strcmp(".", FindFileData.cFileName ) && strcmp("..", FindFileData.cFileName) ) {
sTmpPath = sPath;
sTmpPath += "\\";
sTmpPath += FindFileData.cFileName;
GetAllFiles( sTmpPath.c_str() );
}
}
else {
sTmpPath = sPath;
sTmpPath += "\\";
sTmpPath += FindFileData.cFileName;
cout << sTmpPath << endl;
}
} while ( FindNextFile( hFind, &FindFileData) != 0 );
FindClose( hFind );
}
return;
}
When I add it to the bottom of my form.h (below) file it comes up with these errors (bottom):
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace std;
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
}
protected:
~Form1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::TextBox^ textBox1;
protected:
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::ListBox^ list;
private: System::Windows::Forms::Button^ button1;
private: System::Windows::Forms::Button^ button2;
private:
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
void InitializeComponent(void)
{
this->textBox1 = (gcnew System::Windows::Forms::TextBox());
this->label1 = (gcnew System::Windows::Forms::Label());
this->list = (gcnew System::Windows::Forms::ListBox());
this->button1 = (gcnew System::Windows::Forms::Button());
this->button2 = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
this->textBox1->Location = System::Drawing::Point(97, 23);
this->textBox1->Name = L"textBox1";
this->textBox1->Size = System::Drawing::Size(518, 20);
this->textBox1->TabIndex = 0;
this->textBox1->TextChanged += gcnew System::EventHandler(this, &Form1::textBox1_TextChanged);
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(12, 26);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(79, 13);
this->label1->TabIndex = 1;
this->label1->Text = L"Libray Location";
this->list->FormattingEnabled = true;
this->list->Location = System::Drawing::Point(15, 63);
this->list->Name = L"list";
this->list->Size = System::Drawing::Size(757, 238);
this->list->TabIndex = 2;
this->button1->Location = System::Drawing::Point(697, 337);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(75, 23);
this->button1->TabIndex = 3;
this->button1->Text = L"Play";
this->button1->UseVisualStyleBackColor = true;
this->button2->Location = System::Drawing::Point(616, 337);
this->button2->Name = L"button2";
this->button2->Size = System::Drawing::Size(75, 23);
this->button2->TabIndex = 4;
this->button2->Text = L"Refresh";
this->button2->UseVisualStyleBackColor = true;
this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(784, 372);
this->Controls->Add(this->button2);
this->Controls->Add(this->button1);
this->Controls->Add(this->list);
this->Controls->Add(this->label1);
this->Controls->Add(this->textBox1);
this->Name = L"Form1";
this->Text = L"Form1";
this->ResumeLayout(false);
this->PerformLayout();
}
private: System::Void textBox1_TextChanged(System::Object^ sender, System::EventArgs^ e) {
}
private: System::Void button2_Click(System::Object^ sender, System::EventArgs^ e) {
}
void GetAllFiles( string sPath )
{
WIN32_FIND_DATA FindFileData;
string sTmpPath = sPath;
sTmpPath += "\\*.*";
HANDLE hFind = FindFirstFile( sTmpPath.c_str(), &FindFileData );
if ( hFind == INVALID_HANDLE_VALUE )
return;
else {
do {
if ( ( FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) ) {
if ( strcmp(".", FindFileData.cFileName ) && strcmp("..", FindFileData.cFileName) ) {
sTmpPath = sPath;
sTmpPath += "\\";
sTmpPath += FindFileData.cFileName;
GetAllFiles( sTmpPath.c_str() );
}
}
else {
sTmpPath = sPath;
sTmpPath += "\\";
sTmpPath += FindFileData.cFileName;
cout << sTmpPath << endl;
}
} while ( FindNextFile( hFind, &FindFileData) != 0 );
FindClose( hFind );
}
return;
}
};
1>------ Build started: Project: TestForms, Configuration: Debug Win32 ------
1> TestForms.cpp
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(134): error C2061: syntax error : identifier 'string'
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(136): error C2065: 'WIN32_FIND_DATA' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(136): error C2146: syntax error : missing ';' before identifier 'FindFileData'
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(136): error C2065: 'FindFileData' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(137): error C2065: 'string' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(137): error C2146: syntax error : missing ';' before identifier 'sTmpPath'
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(137): error C2065: 'sTmpPath' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(137): error C2065: 'sPath' : undeclared identifier
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try
#include "windows.h"
#include <string>
at the top of the file
The difficult we do right away...
...the impossible takes slightly longer.
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1>------ Build started: Project: TestForms, Configuration: Debug Win32 ------
1> TestForms.cpp
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(149): error C2664: 'strcmp' : cannot convert parameter 2 from 'WCHAR [260]' to 'const char *'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(149): error C2664: 'strcmp' : cannot convert parameter 2 from 'WCHAR [260]' to 'const char *'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(152): error C2679: binary '+=' : no operator found which takes a right-hand operand of type 'WCHAR [260]' (or there is no acceptable conversion)
1> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(777): could be 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator +=(const std::basic_string<_Elem,_Traits,_Ax> &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(782): or 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator +=(const _Elem *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(787): or 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator +=(_Elem)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> while trying to match the argument list '(std::string, WCHAR [260])'
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(160): error C2679: binary '+=' : no operator found which takes a right-hand operand of type 'WCHAR [260]' (or there is no acceptable conversion)
1> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(777): could be 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator +=(const std::basic_string<_Elem,_Traits,_Ax> &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(782): or 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator +=(const _Elem *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(787): or 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator +=(_Elem)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ax=std::allocator<char>
1> ]
1> while trying to match the argument list '(std::string, WCHAR [260])'
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(161): error C2065: 'cout' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Any idea how to fix this?
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