Writing registry entries

Posted By: TehV

Writing registry entries - 01/08/14 09:16

Hi,
I'd like to associate a file type I have created (*.hwld) with my program, without the user having to manually set this in the file options.
The goal is that the file should be opened in my program when it is double clicked, and I want to be able to set a pretty default icon for these files.

After some reading, I have found out that this requires me to write several keys in HKEY_CLASSES_ROOT.
The sys_set--- functions only allow me to write into HKEY_CURRENT_USER and its subkeys.

Is there a way I can write these keys directly from within the engine, or will I have to create a seperate program to do this for me?

I do see that it is possible to do some pretty nasty hacky stuff with the registry, so I do understand why the registry is (apparently) locked down in these functions.

Posted By: oliver2s

Re: Writing registry entries - 01/08/14 10:29

You can use the Win API functions to do that:

http://msdn.microsoft.com/en-us/library/windows/desktop/ms724875(v=vs.85).aspx

Posted By: TehV

Re: Writing registry entries - 01/08/14 11:19

What include do I use for this?
winreg.h is the one that appears to include all these functions, but it's not available to gamestuio.
windows.h does not contain the functions.

Posted By: oliver2s

Re: Writing registry entries - 01/08/14 11:25

You have to include "windows.h". And you have to add the prototypes by yourself.

I don't really know how to WRITE into the Registry. But here's an example how to READ the registry (got it ages ago on the forums). Maybe this helps you:

Code:

#include <windows.h>

long __stdcall RegOpenKey(long hKey, char* lpSubKey, long phkResult);
#define PRAGMA_API RegOpenKey;advapi32!RegOpenKeyA
long __stdcall RegQueryValueEx(long hKey, char* lpValueName, long lpReserved, long lpType, long  lpData, long lpcbData);
#define PRAGMA_API RegQueryValueEx;advapi32!RegQueryValueExA
long __stdcall RegCloseKey(long hKey);
#define PRAGMA_API RegCloseKey;advapi32!RegCloseKey

var reg_get_STRING(long HKEY, char* KEY, char* VALUE, STRING* *DATA);

var reg_get_STRING(long HKEY, char* KEY, char* VALUE, STRING* *DATA)
{	long regPtr=0, DataType=0, DataLen=999;
	char* dwData = 0;
	dwData = (char*)malloc(sizeof(char*)*DataLen);
	memset(dwData,0,DataLen);
	if(RegOpenKey(HKEY, KEY, &regPtr))	return(false);
	if((RegQueryValueEx(regPtr,VALUE,0,&DataType,NULL,&DataLen))||(DataType!=1))
	{	RegCloseKey(regPtr);	return(false);		}
	STRING* tmpStr = str_create("");
	str_cat_num(tmpStr, "\#%.0f", DataLen);
	if(!*DATA)	*DATA = str_create("");
	str_cpy(*DATA, _chr(tmpStr));		str_remove(tmpStr);
	RegQueryValueEx(regPtr,VALUE,0,0,dwData,&DataLen); 
	str_cpy(*DATA,dwData);
	free(dwData);
	RegCloseKey(regPtr);	return(true);
}

void getRegStr()
{
	STRING* tmpStr = str_create("");
	reg_get_STRING(HKEY_CURRENT_USER, "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders", "Personal", tmpStr);
}

Posted By: TehV

Re: Writing registry entries - 01/08/14 12:13

I'll take a look into this. Thanks!