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Microsoft: Visual C++ FAQ
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Registry Handling
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How to read values of the system's registry
Posted: 18 Feb 04
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Hi all,
Here is a small piece of code that reads any key/value from registry. This program will compile right away (Win32), tested on VC++6.0 .
#include "windows.h"
#include <winreg.h>
#include <stdio.h>
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HKEY keyHandle;
char rgValue [1024];
char fnlRes [1024];
DWORD size1;
DWORD Type;
if( RegOpenKeyEx( HKEY_LOCAL_MACHINE,
"SOFTWARE\\Microsoft\\Windows\\CurrentVersion",0,
KEY_QUERY_VALUE, &keyHandle) == ERROR_SUCCESS)
{
size1=1023;
RegQueryValueEx( keyHandle, "Productid", NULL, &Type,
(LPBYTE)rgValue,&size1);
sprintf(fnlRes,"Product ID of your Windows system is:: %s",rgValue);
}
else strcpy(fnlRes,"Couldn't access system information!");
RegCloseKey(keyHandle);
MessageBox(NULL, fnlRes, "Product ID of Windows", MB_SYSTEMMODAL|MB_ICONINFORMATION);
return 0;
}
I hope it helps, have fun! 
Cheers!
Roy.
PS: This code snippet should be taken as a starting point, not as a final solution. |
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