- 1 year ago
LookupAccountName Always Fails With Error 122 (ERROR_INSUFFICIENT_BUFFER)
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When using the LookupAccountName
function in Windows and encountering an error with code 122 (ERROR_INSUFFICIENT_BUFFER), it indicates that the buffer you provided is not large enough to hold the account name. The error occurs when the buffer size specified by the cchName
parameter is too small.
To resolve this issue, you can follow these steps:
- Determine the required buffer size: Before calling
LookupAccountName
, you need to determine the required buffer size to hold the account name. You can do this by passing a null pointer for thelpName
parameter and settingcchName
to 0:
csharpuint cchName = 0;
LookupAccountName(null, "yourSidOrAccountName", null, ref cchName, null, ref cchDomainName, out _);
- Allocate a buffer of the required size: Use the obtained
cchName
value to allocate a buffer of sufficient size to hold the account name. You can use a character array (char[]
) or a StringBuilder object for this purpose:
csharpvar nameBuffer = new char[cchName];
- Call
LookupAccountName
with the allocated buffer: Pass the allocated buffer and its size toLookupAccountName
to retrieve the account name:
csharpLookupAccountName(null, "yourSidOrAccountName", nameBuffer, ref cchName, null, ref cchDomainName, out _);
- Convert the buffer to a string: Finally, convert the character array or StringBuilder buffer to a string to obtain the account name:
csharpvar accountName = new string(nameBuffer);
Ensure that you are using the correct values for the other parameters in the LookupAccountName
function, such as the account SID or account name.
By following these steps, you can handle the ERROR_INSUFFICIENT_BUFFER
error and retrieve the account name using LookupAccountName
.