Beginner registry problem

Scozturk

Hi! I am trying to use the registry with win32 api c++. But I have difficulties using the RegQueryValue functions. I found some examples on the net but they all use CString and I cant use it because I dont write in MFC... Can someone write an example? ( if possible the whole thing how to get a value?) Thanks in advance! Well... I am a beginner ...

Dominik Reichl

A very simple example how to get the Windows product name:

HKEY hKey;
TCHAR tszProductName[128];
DWORD dwBufSize = 128;

RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("Software\\Microsoft\\Windows\\CurrentVersion"), 0, KEY_READ, &hKey);
RegQueryValueEx(hKey, _T("ProductName"), NULL, REG_SZ, (LPBYTE)tszProductName, &dwBufSize);
RegCloseKey(hKey);

printf("Windows Product Name: ");
printf(tszProductName);

Hope that helps :-D Dominik

_outp(0x64, 0xAD); and __asm mov al, 0xAD __asm out 0x64, al do the same... but what do they do?? ;) (doesn't work on NT)

David Crow

Scolinks wrote: But I have difficulties using the RegQueryValue functions. I found some examples on the net but they all use CString and I cant use it because I dont write in MFC... There are plenty of MSDN examples that do not use MFC. Here's but one:

#define RTN_UNKNOWN 0
#define RTN_SERVER 1
#define RTN_WORKSTATION 2
#define RTN_NTAS 3
#define RTN_ERROR 13

DWORD GetWindowsVariant(void)
{
#define MY_BUFSIZE 32 // Arbitrary initial value.
// Dynamic allocation will be used.
HKEY hKey;
TCHAR szProductType[MY_BUFSIZE];
DWORD dwBufLen = MY_BUFSIZE;
LONG lRet;

if(RegOpenKeyEx(HKEY\_LOCAL\_MACHINE,
    TEXT("SYSTEM\\\\CurrentControlSet\\\\Control\\\\ProductOptions"),
                0,
                KEY\_QUERY\_VALUE,
                &hKey) != ERROR\_SUCCESS) return RTN\_ERROR;

lRet = RegQueryValueEx(hKey,
                TEXT("ProductType"),
                NULL,
                NULL,
                (LPBYTE)szProductType,
                &dwBufLen);

RegCloseKey(hKey);

if(lRet != ERROR\_SUCCESS) return RTN\_ERROR;

// check product options, in order of likelihood
if(lstrcmpi(TEXT("WINNT"), szProductType) == 0) 
     return RTN\_WORKSTATION;
if(lstrcmpi(TEXT("SERVERNT"), szProductType) == 0) 
     return RTN\_SERVER;
if(lstrcmpi(TEXT("LANMANNT"), szProductType) == 0) 
     return RTN\_NTAS;
// else return "unknown variant" code
else return RTN\_UNKNOWN;

}

Here are some searches returned from Google: http://www.windowsitlibrary.com/Content/69/07/1.html http://www.geocities.com/merijn\_bellekom/new/win9xcpu.html http://www.pc-magazin.de/common/forum/forum.php?id=30000624&forum=30&dsp\_start=120&expand=1&suchwort=

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