sort a struct array - C / C++ / MFC Discussion Boards

Help me please, cos there's no help on the web either for this topic.

The platform is Windows XP service pack 2.

I have installed VS.Net 2003 and several other compilers such as Metrowerks CodeWarrior for Symbian OS C++, Symbian OS SDK.... and that's all. Well also the SDKs for Java and J2EE.
But Im baffled, when I try to install from the Hard drive it goes into the installer but fails to go beyond " Searching for installed components ". Why is this happening ? I tried several times but failed. I even uninstalled the Metrowerks compiler hoping that there might be some dependencies, but that doesnt work either. I didnt remove VS.Net yet cos I dont want to go thru the trouble of reinstalling it again. What do u suggest I should do.

P.S. A month back I tried installing VS6 from a CD. But I think the CD was corrupt, since the installation went fine, except for copying certain files. However the installation aborted cos these files were corrupt. Im jus thinkin, if that "half installation" could have effects on this strange behaviour.

I have a C# code below:

Header=Encoding.ASCII.GetString(Header_byte);

How to convert it into visual c++?
I really weak in programming, can somebody help me..

Anyone know if Access 97 can work on Windows XP. Hoping there is a conversion, 'cause I can't get it to work
HELP

I am writing a small application using ODBC API calls to display unicode character. For example, euro sign, the hex value is 0x20AC. How can I display the euro sign character through its hex value in VC++?

Thanks,

- Colin

For our next release, we need to import data from a competitor's product. They use Microsoft Access/Jet. I do know I'll need to install a run-time on the user's system, but am not sure what package that I should be looking at.

As a side note, does anyone have suggestions on the best run-time solutions to read (not write) Access/Jet files? Is there a third party tool available that can read the files directly and do a data dump?

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

You don't need much, just MDAC and the Jet drivers. Both of those are distributed as part of the OS with Windows 2000 and above, but not for NT4. No idea about Windows 9x/Me.

Links: MDAC[^] and the Jet drivers[^].

Thanks much (I was confused about the relationship of MDAC with Jet.)

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

hi, maybe someone can help me to with my code.
I need to sort some tchars which are stored in a struct array by "szNtDeviceName". I tried to use qsort but I'm a noob in C++ and not familiar with pointers, so I can't get it running.

here is the code:

#define _WIN32_WINNT 0x0501

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <cstring>
#include <string.h>
#include <stdlib.h>

#define BUFSIZE MAX_PATH
#define MAXDRIVELETTERS 25

struct DriveInfo
{
bool bIsValidLogicalDrive;
TCHAR szDriveLetter[4];
TCHAR szVolumeName[BUFSIZE];
TCHAR szNtDeviceName[BUFSIZE];
};

int compare( const void *, const void * );

int _tmain(int argc, _TCHAR* argv[])
{
BOOL bFlag;
TCHAR Buf[BUFSIZE]; // temporary buffer for volume name
TCHAR Drive[] = TEXT("c:\\"); // template drive specifier
TCHAR Temp[] = TEXT("c:\\"); // template drive specifier
TCHAR I; // generic loop counter
int i = 0;
char szNtDeviceNameTemp[BUFSIZE]; // temporary buffer for NTDeviceName
int iVolumeMountPoints = 0;

DriveInfo* Arr = new DriveInfo[MAXDRIVELETTERS];

// Walk through legal drive letters, skipping floppies.
for (I = TEXT('c'); I < TEXT('z'); I++ ){

// Stamp the drive for the appropriate letter.
Drive[0] = I;

//LogicalDrivesArray[i].szDriveLetter=I;

bFlag = GetVolumeNameForVolumeMountPoint(
Drive, // input volume mount point or directory
Buf, // output volume name buffer
BUFSIZE // size of volume name buffer
);

if (bFlag){
//found MountPoint add them to array
lstrcpy(Arr[iVolumeMountPoints].szVolumeName, Buf);
Arr[iVolumeMountPoints].bIsValidLogicalDrive = true;

// remove end backslash for query
Temp[0] = Drive[0];
Temp[1] = Drive[1];
Temp[2] = '\0';

lstrcpy(Arr[iVolumeMountPoints].szDriveLetter, Temp);

// get NTDeviceName from DriveLetter
if (QueryDosDevice (Temp, szNtDeviceNameTemp, MAX_PATH)){
lstrcpy(Arr[iVolumeMountPoints].szNtDeviceName, szNtDeviceNameTemp);
}

iVolumeMountPoints++;
}
}

// unsing quicksort to sort by .szNtDeviceName
qsort( Arr, sizeof(Arr[0].szNtDeviceName ), sizeof(Arr[0]), compare );

if (iVolumeMountPoints>0){
printf("%i VolumeMountPoint(s) found\n", iVolumeMountPoints);
for (i=0; i<iVolumeMountPoints; i++){
//if (Arr[i].bIsValidLogicalDrive){
printf("\n%s %s %s", Arr[i].szDriveLetter, Arr[i].szVolumeName, Arr[i].szNtDeviceName);
//}
}
}
else{
printf("no VolumeMountPoint found");
}

//cleanup array
delete[] Arr;

return 0;
}

int compare( const void *a, const void *b )
{
DriveInfo **pa = (DriveInfo **) a, **pb = (DriveInfo **) b;

/* Compare */
return strcmp( (*pa)->szNtDeviceName, (*pb)->szNtDeviceName );
}

qsort (Arr,               // The start of the array. 
       MAXDRIVELETTERS    // Number of elements in the array
       sizeof (DriveInfo) // The size of each element in the array
       compare);          // comparison function

int compare (const void *a, const void *b)
{
    DriveInfo *pa = (DriveInfo *)a, *pb = (DriveInfo *)b;
 
    // Using TCHARs, so use the correct comparison function
    return _tcscmp(pa->szNtDeviceNmae, pb->szNtDeviceName);
}

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" - mYkel - 21 Jun '04

"There's not enough blatant self-congratulatory backslapping in the world today..." - HumblePie - 21 Jun '05

Within you lies the power for good - Use it!

How will I be able to call VB forms and get along with their forms and dialogs? is it possible? if not, is there a way to link VB and VC++ together?

as far as i know there is not
direct way to use a form created by VC
in a VC++ application.
If u get to know inform me also.
U can create an Active X and then use it .

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

I just found out that using COM/ATL will allow you to make dll files in VC++ to be used and called by VB.

Hi,
I am doing a project in win32. I need to delete a registry key and before that I want to set the permissions of that particular key to be able to delete it.
how do I set the permissions and what permissions do I set in order to delete the key.
Pls help.Thanks.

Something like this comes to mind:

RegOpenKeyEx()
GetSecurityInfo(hKey, ...)
BuildExplicitAccessWithName(..., DELETE, GRANT_ACCESS, CONTAINER_INHERIT_ACE)
SetEntriesInAcl(1, ...)
SetSecurityInfo(hKey, ...)
RegCloseKey(hKey)
RegDeleteKey()

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

That's an odd situation you're describing. You're saying that you don't have permission to delete the key, but you do have permission to change the permissions?

Hi

I copied source files and its interfaces from one project to another , and even I've copied the Dialog resource.When I compile it gives errors

error C2065: 'IDC_MASS_RANGE_PANEL' : undeclared identifier
'IDC_MASS_RANGE_MIN_BOXES' : undeclared identifier

The source code is

m_rangeLabelsPanel->Create("", WS_VISIBLE | WS_CHILD, rect, this, (IDC_MASS_RANGE_PANEL));

The only solution I do is to modify the resource.h file each time I get this error with some random numbers.Is it the correct way? Is there anything I must change ? any help is highly appreciated..

Did you copy or cut and paste the needed entries from resource.h?

Dave

I copy it but chnage the number as the number sometimes clashes with other..!

sunguy wrote:
I copy it but chnage the number as the number sometimes clashes with other..

Do u check our Identifier is defined in your header or cpp file or not?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Did you #include "resource.h" in the source or header file?

Hi there!

I have a derived class from CFormView, and sice this form needs to load lots of data, I would like to show a progress bar that is already in the form.

If I do the load and show the progress in the OnInitialUpdate(), I cannot see the progress going!

I've tried to do a PostMessage in the OnInitialUpdate, and manage the message afterwards... but no progress in sight!
I also tried to do a PostMessage in the OnShowWindow when the bShow is TRUE. Again not yet visible!

Does any one knows what message should I catch after the form is visible?
I'm using a variable to count if its the first time I have a Paint... but it seems that its not the way to do it...

Thanks for your time in advance.

why not use a splash screen?

Yes it could be. And I also could use a dialog with a progress, which I already have.

But, I don't want them! Besides, the problem remains, and I don't want a workarround (wich I already have, via the WM_PAINT).

The real problem is: why do I get a WM_SHOWWINDOW message and the form is not visible? What message sould I expect after the form is shown?

I don't want a workarround, just to understand the message sequence...

ALMC

Hello everybody,
I am writing a simple application in MFC , similar to Spy++ Utility , that displays different information about chosen window.
I want to draw that black rectangle(like in Spy++) over windows ,when mouse is over that window. I manage to draw it , but when i move mouse to another window the rectangle stays on the previous window and on the new also.
I used to store previous windows handle and when the mouse was over another window i used to call the Invalidate() function for the previous window.
For some strange reasons this worked on 90% of the windows , there were some windows where the rectangle stayed partialy.

Can anyone suggest me any another way of achieving this??

"Success is the ability to go from one failure to another with no loss of enthusiasm." - W.Churchill

Look here:

http://www.codeproject.com/dialog/windowfinder.asp

Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements. -- Peter Gibbons