SOLVED Cannot access #include files – “permission denied” - C / C++ / MFC Discussion Boards

Re: The 'rename' function gives errno == -1

David Crow20-Jan-13 15:17

David Crow

20-Jan-13 15:17

Anthony Appleyard wrote:

The apostrophes are not in the strings.

What about the single backslashes?

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Re: The 'rename' function gives errno == -1

Anthony Appleyard20-Jan-13 18:15

Anthony Appleyard

20-Jan-13 18:15

> What about the single backslashes?

In the strings in the program, the backslashes are double.

Re: The 'rename' function gives errno == -1

Richard MacCutchan20-Jan-13 4:49

Richard MacCutchan

20-Jan-13 4:49

errno does not have a value of -1.

Re: The 'rename' function gives errno == -1

jschell20-Jan-13 6:13

jschell

20-Jan-13 6:13

Recapping scattered comments.

After EACH method call IMMEDIATELY check the return value.
if the return value is not zero then IMMEDIATELY call errno. Do NOT make any other API calls before calling errno.

So you code should look like the following (with the included suggestion of strerror

int ret = rename(...);
if (ret != 0)
{   
   // Do NOT put other API calls here!
   int errNum = errno;
   // At this point you can make other API calls.
   printf("Failed to rename %s", strerror(errNum));
}

BANZAI :: bug found

Anthony Appleyard20-Jan-13 23:50

Anthony Appleyard

20-Jan-13 23:50

I just found that I had fopen()'ed the same file twice without fclose()'ing it between. The offending rename(,)'s now work OK. I am sorry to take up so much of your time.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I just now inserted into my program this instruction:-

i=rename("C:\\Poser4\\Runtime\\Libraries\\character\\Divers\\Divers_rebreathers\\CDBA\\miaow.txt",
"C:\\Poser4\\Runtime\\Libraries\\character\\Divers\\Divers_rebreathers\\CDBA\\wuff.txt");

to rename a file which I had just created and the program never opens it. And the rename went OK.

The file that I was trying to rename it before :: I had fopen()'ed it in read mode, and read from it, and then fclose()'ed it; after that I tried to rename it, and that rename was refused.

modified 21-Jan-13 6:13am.

Is there a way to trace an mpi message through a topology?

Cioroiu Adrian-Nicu19-Jan-13 6:39

Cioroiu Adrian-Nicu

19-Jan-13 6:39

Hello, first of all I have to apologise if my question is stupid or asked in the wrong place.

I'm rather new to mpi and i just discovered how to achiave a topology aware communicator, using mpi_graph_create. The thing that I cannot seem to achieve is to track messages through said topology.

For example if I call MPI_Send/MPI_Recv is 2 "non-adjacent" processes, is there a way to check the route that message takes through the graph?

Re: Is there a way to trace an mpi message through a topology?

Richard MacCutchan19-Jan-13 21:32

Richard MacCutchan

19-Jan-13 21:32

What is "mpi"?

SOLVED Cannot access #include files – “permission denied”

Vaclav_19-Jan-13 4:38

Vaclav_

19-Jan-13 4:38

I have downloaded IVT library ( Integrating Vision Toolkit), I made my app dependent on this library ( as DSP project in VC6.0) , I can partially compile the app because I get “permission denied” when I get to #include preprocessor statement.
I have checked the directory permissions and I have grayed out “read only” checked in IVT directory.
All of the sources I used so far said that such grayed out “read only” checked ( in XP) does not make any difference (?) when directories are involved.
All of my app directories have that grayed out “read only” checked and I have no problem including other (OpenCV) libraries.
I am tempted to recopy / re-download the IVT files , but would like to hear from the forum what is going on here.
Appreciate any advise.
Cheers
Vaclav

Addendum
Here is the real code snippet
I must be doing something really stupid.

#pragma message("include IVT ")
#include <Z:\Program Files\IVT\ivt-1.3.19\IVT\src> // fails
#include <Z:\Program Files\IVT\ivt-1.3.19\IVT\src\Calibration> // fails
#include <Z:\Program Files\IVT\ivt-1.3.19\IVT\src\Calibration\Calibration.h> // OK

-- modified 19-Jan-13 13:10pm.

Re: Cannot access #include files – “permission denied”

Richard MacCutchan19-Jan-13 5:23

Richard MacCutchan

19-Jan-13 5:23

You cannot include entire directories.

Re: Cannot access #include files – “permission denied”

Vaclav_19-Jan-13 7:09

Vaclav_

19-Jan-13 7:09

How stupid of me, I have done some stupid things but this one takes the first dummy price! Thanks Richard.

Re: Cannot access #include files – “permission denied”

Richard MacCutchan19-Jan-13 7:11

Richard MacCutchan

19-Jan-13 7:11

Vaclav_Sal wrote:
I have done some stupid things

So have we all; it's a good learning experience.

Re: Cannot access #include files – “permission denied”

Vaclav_19-Jan-13 12:02

Vaclav_

19-Jan-13 12:02

Richard,
I spoke too soon.
Now I need to figure out how to unclude all the header files of SUBDIRECTORIES. I need the IVT library in debug mode.

Do I have to create my own parent #include file ( such as
stdafx.h) with all the other headers or is it a time to learn how to use CMake?

There is a Make file in the IVT stuff I dowloaded , but I never used Make.

Cheers Vaclav

Re: Cannot access #include files – “permission denied”

Richard MacCutchan19-Jan-13 21:26

Richard MacCutchan

19-Jan-13 21:26

Vaclav_Sal wrote:
Do I have to create my own parent #include file ( such as
stdafx.h) with all the other headers or is it a time to learn how to use CMake?

I'm not sure what you mean, the two are not connected. Using pre-compiled headers via stdafx.h merely helps to reduce the compile time of your source files, but you still need to #include all the individual header files. I have used make in the past and it is a good system, but I don't think it offers any advantages when you are creating Windows applications. Using the VS build system will do all you need.

Writing a non-Windows program

Anthony Appleyard19-Jan-13 1:23

Anthony Appleyard

19-Jan-13 1:23

One of the bygone useful features of the ancient days before DOS programming vanished, was ability, when I wanted to calculate something quickly, to quickly write a program where control started at the beginning and ran down the text like in a knitting pattern and and I did not have to catch Windows messages and events. A short example follows at the end of this message. Please, how can I use Visual C++ to write and run such a program, and how to run it? (I have Windows Vista).

#include <stdio.h>
#include <std.h>
int F; char s[256],*nl="\n";
void v(int i,int j){sprintf(s,"%1d,%-3d %c%c%c%c ",i,j,0xc0,j,i,0xc0);
    write(F,s,11);}
main(){int i,j; F=open("t$$",0x8002);
for(j=0;j<=84;j++) v(4,j); write(F,nl,1);
for(j=0;j<=34;j++) v(5,j); write(F,nl,1);
for(j=0;j<=234;j++) v(6,j); write(F,nl,1);
close(F);}

Re: Writing a non-Windows program

Richard MacCutchan19-Jan-13 1:35

Richard MacCutchan

19-Jan-13 1:35

Just set your project to "Console application".

How to get Visual C++ to use the char* forms of standard functions?

Anthony Appleyard19-Jan-13 1:15

Anthony Appleyard

19-Jan-13 1:15

I am writing a Visual C++ program, using features from an from an older Visual C++ program which I wrote. How can I (for example) get the compiler to use the version of the standard function GetFileName(.....) which needs a char* parameter rather than the version which needs a WCHAR* parameter?

Re: How to get Visual C++ to use the char* forms of standard functions?

SajeeshCheviry19-Jan-13 1:29

SajeeshCheviry

19-Jan-13 1:29

Actualy i don't understand your problem. will you please eloborate?

Re: How to get Visual C++ to use the char* forms of standard functions?

Richard MacCutchan19-Jan-13 1:34

Richard MacCutchan

19-Jan-13 1:34

See my answer.

Re: How to get Visual C++ to use the char* forms of standard functions?

Richard MacCutchan19-Jan-13 1:33

Richard MacCutchan

19-Jan-13 1:33

Check the project settings in your application, and if the Character Set says Unicode, switch to MBCS or Not Set. Alternatively use a properly constructed Unicode parameter.

Re: How to get Visual C++ to use the char* forms of standard functions?

SajeeshCheviry19-Jan-13 1:37

SajeeshCheviry

19-Jan-13 1:37

Oh. good richard.

Re: How to get Visual C++ to use the char* forms of standard functions?

Anthony Appleyard19-Jan-13 12:06

Anthony Appleyard

19-Jan-13 12:06

Thanks.

For beginners introduction to CFormView, CView ?

bosfan18-Jan-13 11:04

bosfan

18-Jan-13 11:04

Hi Community,
is there a Article about CFormView, CView, CListView etc. for Beginners?
I always work with dialog based Applications, so i don’t have any experience with this Classes.
Any help would be great for me.
Here i like to thanks to all who help me before in my problems Smile | :)