Thread: RE: [Dev-C++] Flush or set valeu from a key of Registry.

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Hi,

To manage registry keys and values, you must first open a key and then
manage its values, SO...
	You must have in mind that registry _KEYS_ and registry _VALUES_ are
different things!!!

(Take a look at the code bellow and check variables named: szKey and
szValueName)

Here you have a little C program that reads a DWORD value, increases it and
stores it again in the registry. Values are printed on the screen.
To handle a string you should modify a few values: 
	dwDataType		must macht with REG_STRING,
	dwDataSize  	must be high enough to store the retrieved value,
	and few more...

Hope this helps!

Regards ,Santy

<CODE>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <windows.h>

#define MAX_VALUE	256

// FUNTIONs DEFINITIONs
void OutputString(char* szInfoStr);
void OutputValue(DWORD dwValue, char* lpStr = NULL);

// FUNCTIONs IMPLEMENTATION
void OutputString(char* lpStr)
{
    if (lpStr != NULL)
        printf("%s\n",lpStr);
}

void OutputValue(DWORD dwValue, char* lpStr)
{
    char szStr[256];

    if (lpStr != NULL)
        sprintf(szStr,"[%s] Value: %d",lpStr,(int)dwValue);
    else
        sprintf(szStr,"Value: %d",(int)dwValue);

        OutputString(lpStr);
}

void ShowSystemErrorMsg(DWORD dwError)
{
  LPVOID lpMsgBuf;

  FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |FORMAT_MESSAGE_FROM_SYSTEM,
      NULL, dwError,
      (DWORD)MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), 
      (LPTSTR) &lpMsgBuf, (DWORD) 0,
      NULL);

  OutputString((char*)lpMsgBuf);

  LocalFree(lpMsgBuf);
}

int main(int argc, char *argv[])
{
  char  szKey[]          = "Whatever\\Your\\Key\\Path\\Looks\\Like";
  char  szValueName[]	 = "MyValue";

  UINT  uValue			 = 0;

  HKEY  hRegKey          = NULL;

  DWORD  dwError          = 0;
  DWORD  dwDataType       = 0;                // type buffer
  DWORD  dwDataSize       = sizeof(DWORD);    // size of data buffer
  LPBYTE lpByteData       = NULL;             // data buffer

  // Try to open key
  dwError = (DWORD) RegOpenKeyEx(HKEY_CURRENT_USER, (LPCTSTR)szKey, 0,
KEY_ALL_ACCESS, &hRegKey );

  if (dwError == ERROR_SUCCESS)
  {
     lpByteData = (LPBYTE) LocalAlloc(LPTR,(UINT)dwDataSize);

     if (lpByteData != NULL)
     {
         // Get current value
         dwError = (DWORD)
RegQueryValueEx(hRegKey,(LPCTSTR)szValueName,NULL,

(LPDWORD)&dwDataType,lpByteData,(LPDWORD)&dwDataSize);

         if ( (dwError == ERROR_SUCCESS)&&(dwDataType == REG_DWORD) )
         {
             // Output retrieved data
			 uValue = (UINT) (*lpByteData);
             OutputValue(uValue,"Previous Value");

             // Increase current cycle
             uValue = (++uValue%MAX_VALUE);
             OutputValue(uValue,"Increased Value");

             // Store new value for MyValue at registry
             dwError = RegSetValueEx(hRegKey,(LPCTSTR)szValueName, 0,
                           REG_DWORD, (BYTE*)&uValue, dwDataSize);

             if ( (dwError != ERROR_SUCCESS))
             {
                 OutputValue(dwError,"RegSetValueEx - dwError");
                 ShowSystemErrorMsg(dwError);
             }

             // Flush Data anyway
             RegFlushKey(hRegKey);
         }

         // Free dynamic memory
         LocalFree(lpByteData);
     }

     // Close RegistryKey
     RegCloseKey(hRegKey);
  }
  else
     ShowSystemErrorMsg(dwError);

	return 0;
}
</CODE>

-----Original Message-----
From: we...@ha... [mailto:we...@ha...] 
Sent: Saturday, February 23, 2002 10:01 PM
To: dev...@li...
Subject: [Dev-C++] Flush or set valeu from a key of Registry.

Hi,

I want to flush (delete) a string value from registry.

I tryed to set it to 0 of this mode:

#include <windows.h>

    int main(int argc, char *argv[])
    {
      HKEY hKey;
      DWORD dwDisposition;
      unsigned char *szBuf = (unsigned char *)strdup("0");

      if (RegSetValueEx(HKEY_CURRENT_USER,
"\\Software\\Microsoft\\Security\\say\\", 0, REG_SZ, szBuf,
strlen((char*)szBuf)) != ERROR_SUCCESS)
        return 1;

      RegCloseKey(hKey);

      return 0;
    }

But it didn't set the value of:
\\HKEY_CURRENT_USER\\Software\\Microsoft\\Security\\say to "0". It crate a
key \\Software\\Microsoft\\Security\\say in \\HKEY_CURRENT_USER . :P

How to do to is set this value ??

And how to for example delete a key \\Software\\Microsoft\\Security\\say\\
??

Can someone gave examples ?? :)

Thkz and Best Regards.

[ ]'s

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Thread: RE: [Dev-C++] Flush or set valeu from a key of Registry.

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