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i have to list all the hardware devices in the system by c language. is there any function to display all the devices. anyone know this. please help me
Arise Awake Stop Not Till ur Goal is Reached.
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Please don't keep repeating the same question. There is no simple function. You could get all the information you need from the registry.
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Hey, I want to creat a new folder with a new file. Now my code can only creat a new folder but no file.What is the wrong with my code?Please help anyway you can.. Thanks in advance.
m_Luting is the name of the folder , type CString
m_Name is the name of the file ,type CString
My code :
char path[300];
CString stname=".bin";
CString cell;
CreateDirectory(_T(m_Luting), NULL);
strcat(path,m_Luting);
strcat(path,m_Name);
strcat(path,stname);
fstream fMyfile;
fMyfile.open(path,ios:out|ios::binary|ios::trunc);
if(!fMyfile){ exit(-1);}
fMyfile.close();
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zhangguoliming wrote: strcat(path,m_Luting);
This should probably be strcpy() instead.
zhangguoliming wrote: fMyfile.open(path,ios:out|ios::binary|ios::trunc);
What is the value of path at this point?
On a side note, since you are using MFC, have you looked into CFile?
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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1) don't put m_Luting in a _T() macro.
2) Since you're using MFC, use it all the way...
if (CreateDirectory(m_Luting))
{
CString sPath;
sPath.Format("%s\\%s%s", m_Luting, m_Name, stName);
CFile file;
CFileException e;
if (file.Open(sPath, CFile::modeCreate | CFile::modeWrite, &e)
{
#ifdef _DEBUG
afxDump << "File could not be opened " << e.m_cause << "\n";
#endif
return;
}
else
{
file.Close();
}
}
else
{
AfxMessageBox("Could not create folder.");
}
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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zhangguoliming wrote: Hey, I want to creat a new folder with a new file. Now my code can only creat a new folder but no file.What is the wrong with my code?Please help anyway you can.. Thanks in advance.
CDiskObject: Simplifying common disk operations[^]
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You can also use of CreateFile for create or open a file
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Hi,
Can I change executable name which my project will produce after compilation, based on some define in projects code.
For example can I have something like:
#define EXE_NAME "MyApp.exe"
such a way that after building the project I will actually get MyApp.exe file?
Using VS 2003, VC++
Thanks,
Mike
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suggam wrote: Can I change executable name which my project will produce after compilation, based on some define in projects code.
I don't think so. The linker, not the compiler, determines the output file name.
Maybe this will work for your needs: OutputFile Property[^]
Mark
Great job, team. Head back to base for debriefing and cocktails.
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Try coming up with a post-build step?
-or -
You could always create a custom configuration - instead of using "Win32 Debug", create a configuration called "Win32 MyName Debug". That way, you can assign whatever configuration properties you wanted, including what to call the resulting exe file.
I don't know if VS2003 allows you to specify custom configurations, but VS2005 does.
-- modified at 16:28 Wednesday 14th February, 2007
Can whoever voted this a 1 please explain why you felt the need to do so?
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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John Simmons / outlaw programmer wrote: I don't know if VS2003 allows you to specify custom configurations, but VS2005 does.
VS2003 does. "Build" - "Configuration Manager"
John Simmons / outlaw programmer wrote: Can whoever voted this a 1 please explain why you felt the need to do so?
At least I could bring you to 3.0 
Failure is not an option - it's built right in.
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The thing is that builds should happen automatically, so I can not manually create separate build configurations for every executable name I need.
May be there is a way to automatically change project build property by means of some macros which will read the name from some file? Ideally it should parse one of the source files and find particular #define there with the name value to use.
Thanks for yuor answers.
Mike
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I think you're going to have to export the make file and use the command line to build your project using the linker /OUT= parameter to specify the name of the executable file.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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Ok, but even in that case I still need to extract that actual name from source file somehow.
So, right now I am thinking about just having some general name for output file after building. Also I will have POST_BUILD action in project settings where some small self-made application will start, it will parse certain source file looking for that #define, extract desired name, and rename resulting output file according to that extracted value.
That seams to be the most straight forward approach 
Thanks for your replys guys,
Mike
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Some topics bellow, i discover a way to pass a pointer to a function etc. That whas great.
But the code is in a DLL, and must be called from a VB6 application.
That's the code:
#######################################
#include <windows.h>
struct tpteste
{
int i;
};
void __stdcall test( tpteste **l )
{
tpteste *t = new tpteste[4];
t[0].i = 99;
t[1].i = 98;
t[2].i = 97;
t[3].i = 96;
*l = t;
}
void __stdcall doNothing( void )
{
tpteste *w = NULL;
test(&w);
}
#######################################
I need to discover how to call the test function from VB.
If someone can help... thanks in advance.
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Sorry about the tags.
And about the place to ask, i had a problem: i looked at the "Message Boards" menu at the top right of the screen and couldn't find a VB6 forum, only VB.NET. But after i looked better and found a VB / VB.NET forum, and posted it there. So, sorry about that too. I'm a newbie here.
If anyone can answer i'd be glad to know, and in the future i will be more careful.
Thanks.
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I have a CMap that does a mapping between <cstring ,="" cmyobj="" *="">
This map is populated by reading a file ( line by line ) and CMyObj is constructed from information in that line .
So the logic is something like
Map<string, cmyobj="" *=""> map ;
while eof
{
line = readline
string key = line.FirstToken
CMyObj *p= new CMyObj(line)
map[key] = p ;
}
Now I am modifying where p is going to be allocated from Virtual memory instead of heap
Unfortunately i will need to be able to reconstruct this object based on address
Hence when i do the lookup the map will only give me the address but the size is not available as
is there a mechanism that I can use to decide the size and transparently recreate the object from virtual memory ?
Engineering is the effort !
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act_x wrote: Now I am modifying where p is going to be allocated from Virtual memory instead of heap
I don't understand why or what you want to do ?
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act_x wrote: Now I am modifying where p is going to be allocated from Virtual memory instead of heap
and i'd be curious to know how you do that
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All memory in user mode programs is virtualised. The heap is in virtual memory. The heap is build on top of virtual memory. You can only allocate virtual memory in 4k chunks (on x86 platforms): the heap is a data structure to minimise the waste by carving up a virtual memory chunk into pieces to serve requests smaller then the page size.
Steve
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hi
i've an application that installs some files to application folder in program files.a user with limited rights are not able to access that files. but every user wants thats files for modification. it was working properly in xp as program files is not restricted to the administrator. but in vista program file is a restricted area.how can i solve this problem.
thanx in advance
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is this a programming question related to VC++ ?
otherwise if you need some administration, ask the Operating System or Vista Forums...
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I would redesign the way your application set up files.
if this is a single user application, and the "files" are will only be used and modified by one user ( and not shared betweeen other users) use the APPDATA folder ( Document And Settings\<user>\Application Data\ ... )
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The answer is simple but you probably won't like it: Don't write to Program Files. You have a design flaw in the app which has been ignored (or at least was not evident) until now.
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Consider the following code :
vector<int> *testVector = new vector<int>();
testVector->push_back(1);
int &testRef = (*testVector)[0];
cout << testRef << endl;
testVector->clear();
delete testVector;
cout << testRef << endl;
How can i detect that the reference has become invalid ?
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