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I have a sample code about registry.  It is not the function what u wanted.
But hope, it can still help you to understand the registry.

// QueryKey - Enumerates the subkeys of key and its associated values.
//     hKey - Key whose subkeys and values are to be enumerated.

#include <windows.h>
#include <stdio.h>
#include <tchar.h>

#define MAX_KEY_LENGTH 255
#define MAX_VALUE_NAME 16383

void QueryKey(HKEY hKey)
{
    TCHAR    achKey[MAX_KEY_LENGTH];   // buffer for subkey name
    DWORD    cbName;                   // size of name string
    TCHAR    achClass[MAX_PATH] = TEXT("");  // buffer for class name
    DWORD    cchClassName = MAX_PATH;  // size of class string
    DWORD    cSubKeys=0;               // number of subkeys
    DWORD    cbMaxSubKey;              // longest subkey size
    DWORD    cchMaxClass;              // longest class string
    DWORD    cValues;              // number of values for key
    DWORD    cchMaxValue;          // longest value name
    DWORD    cbMaxValueData;       // longest value data
    DWORD    cbSecurityDescriptor; // size of security descriptor
    FILETIME ftLastWriteTime;      // last write time

    DWORD i, retCode;

    TCHAR  achValue[MAX_VALUE_NAME];
    DWORD cchValue = MAX_VALUE_NAME;

    // Get the class name and the value count.
    retCode = RegQueryInfoKey(
        hKey,                    // key handle
        achClass,                // buffer for class name
        &cchClassName,           // size of class string
        NULL,                    // reserved
        &cSubKeys,               // number of subkeys
        &cbMaxSubKey,            // longest subkey size
        &cchMaxClass,            // longest class string
        &cValues,                // number of values for this key
        &cchMaxValue,            // longest value name
        &cbMaxValueData,         // longest value data
        &cbSecurityDescriptor,   // security descriptor
        &ftLastWriteTime);       // last write time

    // Enumerate the subkeys, until RegEnumKeyEx fails.

    if (cSubKeys)
    {
        printf( "\nNumber of subkeys: %d\n", cSubKeys);

        for (i=0; i<cSubKeys; i++)
        {
            cbName = MAX_KEY_LENGTH;
            retCode = RegEnumKeyEx(hKey, i,
                     achKey,
                     &cbName,
                     NULL,
                     NULL,
                     NULL,
                     &ftLastWriteTime);
            if (retCode == ERROR_SUCCESS)
            {
                _tprintf(TEXT("(%d) %s\n"), i+1, achKey);
            }
        }
    }

    // Enumerate the key values.

    if (cValues)
    {
        printf( "\nNumber of values: %d\n", cValues);

        for (i=0, retCode=ERROR_SUCCESS; i<cValues; i++)
        {
            cchValue = MAX_VALUE_NAME;
            achValue[0] = '\0';
            retCode = RegEnumValue(hKey, i,
                achValue,
                &cchValue,
                NULL,
                NULL,
                NULL,
                NULL);

            if (retCode == ERROR_SUCCESS )
            {
                _tprintf(TEXT("(%d) %s\n"), i+1, achValue);
            }
        }
    }
}

int _tmain(void)
{
   HKEY hTestKey;

   if( RegOpenKeyEx( HKEY_CURRENT_USER,
        TEXT("SOFTWARE\\Microsoft"),
        0,
        KEY_READ,
        &hTestKey) == ERROR_SUCCESS
      )
   {
      QueryKey(hTestKey);
   }

   return 0;
}

On Jan 24, 2008 12:40 PM, Ben Melikant <ili...@at...>
wrote:

> Hello all. I recently looked up usage of registry functions to use the
> Windows registry to automatically start a program. I decided to make
> some test applications to practice using them. This is the code I have
> to get the default value of registry key HKEY_LOCAL_MACHINE:
>
> #include <windows.h>
> #include <iostream>
>
> using namespace std;
>
> int main ()
> {
>  LPDWORD retType;
>  LPBYTE retDat;
>
>  RegQueryValueEx (HKEY_LOCAL_MACHINE,
>                               "",
>                               NULL,
>                               retType,
>                               retDat,
>                               20);
>
> cout << retType;
> cout << retDat;
>
>  return 0;
> }
>
> This program compiles fine, but when i run it windows terminates it with
> an error message. If anyone would like to see the error message, i can
> get it. If anyone can possibly come up with an explanation as to why I'm
> coming up with a system error, please help!
>
> -------------------------------------------------------------------------
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> Defy all challenges. Microsoft(R) Visual Studio 2008.
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>

One installation packet only contain the IDE. This packet is intended for
people who already have the MinGW tools. The other installation packet
contains both gcc and the IDE.

It sounds like you have installed the version without any compiler.

/pwm


On Fri, 25 Jan 2008, Eric wrote:

> When I installed the program version 4.9......  it some GNU was not in the
> path satement
>
>
> And you get it, my code will not compile.
> I tried something in the autoexec.bat file but then my computer win98se
> would not reboat  and that caused a bit drama
>
>
> (1) I had a look in program folder and could not see any
> read-me-get-it-working.txt files
> (2) I had a look in the help files and there was no help on "PATH"
>
> I wonder what sun netbeans is likem I will have to go back to windows XP?
>
>
>
>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

Hello all. I recently looked up usage of registry functions to use the 
Windows registry to automatically start a program. I decided to make 
some test applications to practice using them. This is the code I have 
to get the default value of registry key HKEY_LOCAL_MACHINE:

#include <windows.h>
#include <iostream>

using namespace std;

int main ()
{
 LPDWORD retType;
 LPBYTE retDat;

 RegQueryValueEx (HKEY_LOCAL_MACHINE,
                               "",
                               NULL,
                               retType,
                               retDat,
                               20);
 
cout << retType;
cout << retDat;
 
 return 0;
}

This program compiles fine, but when i run it windows terminates it with 
an error message. If anyone would like to see the error message, i can 
get it. If anyone can possibly come up with an explanation as to why I'm 
coming up with a system error, please help!

When I installed the program version 4.9......  it some GNU was not in the
path satement


And you get it, my code will not compile.
I tried something in the autoexec.bat file but then my computer win98se
would not reboat  and that caused a bit drama


(1) I had a look in program folder and could not see any
read-me-get-it-working.txt files
(2) I had a look in the help files and there was no help on "PATH"

I wonder what sun netbeans is likem I will have to go back to windows XP?