how to read the registrykey REG_DWORD value

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C++

DWORD dwType = REG_DWORD;
size1=1024;	
			
if((RegQueryValueEx(keyHandle,"Value",NULL,&dwType,(LPBYTE)rgValue1,&size1))
SetDlgItemText(IDC_EDIT, rgValue1);

I want to read a registrykey(value) which is of DWORD type and want to display it in the editbox but RegQueryValueEx function returns empty value.please help me

Posted 6-Jul-15 21:47pm

Member 11648410

Updated 6-Jul-15 22:09pm

Leo Chapiro

v2

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Comments

Richard MacCutchan 7-Jul-15 4:16am

Check the return value from the function call to see what the error is. You also should note that you cannot use SetDlgItemText with a DWORD value, you should use SetDlgItemInt.

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Leo Chapiro · Answer 1 · 2015-07-06T22:19:00

Solution 1

The return value is

VB

ERROR_SUCCESS 0 (0x0)

if no errors occurs!

You need to change

C++

if((RegQueryValueEx(keyHandle,"Value",NULL,&dwType,(LPBYTE)rgValue1,&size1))

with

C++

if(RegQueryValueEx(keyHandle,"Value",NULL,&dwType,(LPBYTE)rgValue1,&size1 == ERROR_SUCCESS)

Posted 6-Jul-15 22:19pm

Leo Chapiro

Updated 6-Jul-15 22:23pm

v2

User 59241 · Answer 2 · 2015-07-06T22:27:00

If you read this: https://msdn.microsoft.com/en-us/library/windows/desktop/ms724911(v=vs.85).aspx[^]

and this:
https://social.msdn.microsoft.com/Forums/windowsdesktop/en-us/21c791ad-f1f3-4941-8ddc-8443447403c5/how-to-use-regqueryvalueex-function-to-query-a-regdword-value-?forum=windowsgeneraldevelopmentissues[^]

You will need something like this (example only)

C++

    DWORD dwData;
DWORD cbData = sizeof(DWORD);
DWORD dwRet;
   dwRet = RegQueryValueEx( HKEY_PERFORMANCE_DATA,
                     TEXT("Global"),
                     NULL,
                     NULL,
                     (LPBYTE)&dwData,
          &cbData );