Here's the code I wrote to save the Enabled status of my GUIEXT.
There are two methods SavePrefs(InstanceStruct) and
LoadPrefs(InstanceStruct).
You need to define REGKEY_ROOT near the top of your guiext.c file.
I put mine near the #define AUTHOR, and #define EMAIL.

Something like:
#define REGKEY_ROOT "Software\\MyCompany\\MyGUIEXT\\"

This is the key under HKCU where the registry keys will be placed.

I catch the error codes, but right now nothing is done with them.

What should I do if an error occurs during this process?  Just ignore it?
Set Enabled false?  Popup a error dialog to the user?  What's the desired
POV error handling approach for GUIEXTs?


void SavePrefs(InstanceStruct *Instance) {
   LONG error;
   DWORD dispositionValue;
   HKEY guiextHKey;
   DWORD value;

   error = RegCreateKeyEx( HKEY_CURRENT_USER,  // Parent hKey.
                           REGKEY_ROOT,        // Path to child.
                           0,                  // reserved
                           "",                 // Type of node to create,
ignored if entry already exists..
                           1,                  // Behavior options
(volatile/non-volatile).
                           KEY_ALL_ACCESS,     // Requested access to key.
                           NULL,               // Security structure that we
don't have.
                           &guiextHKey,        // The child's hKey.
                           &dispositionValue   // Whether the entry was
create or simply opened.
                         );

   value = Instance->Enabled ? 1 : 0;
   error = RegSetValueEx( guiextHKey,    // HKey to set the value on.
                          "Enabled",     // The name of the value under the
hkey to set the value on.
                          0,             // reserved.
                          REG_DWORD,
                          (BYTE*)&value,
                          4
                        );
   if(error != 0) {
      error = RegCloseKey(guiextHKey);
      Instance->Enabled = TRUE;
      SavePrefs(Instance);
   } else {
      error = RegCloseKey(guiextHKey);
      Instance->Enabled = (DWORD)*data;
   }


}

void LoadPrefs(InstanceStruct *Instance) {
   LONG error;
   DWORD dispositionValue;
   HKEY guiextHKey;
   DWORD type;
   DWORD length;
   char data[4];

   error = RegCreateKeyEx( HKEY_CURRENT_USER, // Parent hKey.
                           REGKEY_ROOT,       // Path to child.
                           0,                 // reserved
                           "",                // Type of node to create,
ignored if entry already exists..
                           1,                 // Behavior options
(volatile/non-volatile).
                           KEY_ALL_ACCESS,    // Requested access to key.
                           NULL,              // Security structure that we
don't have.
                           &guiextHKey,       // The child's hKey.
                           &dispositionValue
                         );

   error = RegQueryValueEx( guiextHKey, // HKey to set the value on.
                            "Enabled",  // The name of the value under the
hkey to set the value on.
                            0,          // reserved.
                            &type,
                            data,
                            &length
                          );
   error = RegCloseKey(guiextHKey);
   Instance->Enabled = (DWORD)*data;

}

DWORD WINAPI MenuSelect (IDataStruct *InstanceData, WPARAM Code)
{
   InstanceStruct        *Instance = (InstanceStruct *)
InstanceData->InstanceID ;
   ExternalVarStruct     ExternalVars;

   switch(Code) {
      case CM_ENABLED :
         Instance->Enabled = !Instance->Enabled ;
         CheckMenuItem (InstanceData->hMenu, CM_ENABLED +
InstanceData->FirstMenuItem, Instance->Enabled ? MF_CHECKED : MF_UNCHECKED)
;
         SavePrefs(Instance); // *** Here's where SavePrefs goes.
         return(0) ;
...
...

   // READ THIS FROM AN INI FILE ! it should be persistent.
   //Instance->Enabled = TRUE ;
   LoadPrefs(Instance);  // *** Here's where LoadPrefs goes.





--
#macro Q(A,E,W)box{-A/2,A/2pigment{rgb 9*W}translate E*A+W/1000}#end#macro
M(D,E)#local A=1/pow(3,D);#if(D<3)#local C=D+1;union{M(C,1)M(C,x+y)M(C,x+z)
M(C,y+z)M(C,x+y-z)M(C,x+z-y)M(C,y+z-x)M(C,x-y)M(C,z-x)M(C,y-z)M(C,y-x)M(C,
x-z)M(C,z-y)M(C,x-y-z)M(C,y-x-z)M(C,z-x-y)translate A*E}#else Q(A,E,x)Q(A,E
,y)Q(A,E,z)#end#end union{M(0,0)rotate<45,145,0>translate z*2}//Andrew

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