• BoQsc (60/61) Aug 19 2023 Today I've tried to use Windows API once again and encountered

BoQsc <vaidas.boqsc gmail.com> writes:

Today I've tried to use Windows API once again and encountered 
very time consuming case.
It's been a long time since the last time I used Windows API.

This time I've had an idea that it would be interesting to get 
thread associated username using Windows API. So after some time 
while trying to come up with something that might seemingly work. 
I've encountered this error:


```
C:\Users\Windows10\Desktop\interpreter>dmd WindowsGetUserName.d
lld-link: error: undefined symbol: GetUserNameA
 referenced by WindowsGetUserName.obj:(_Dmain)



Error: linker exited with status 1

```



```D
import std.stdio;
import core.sys.windows.windows;
import std.conv;
void main() {
     char[256] userName; // Buffer to store the user name

     DWORD userNameSize = userName.length; // Size of the buffer

     // Call GetUserName to retrieve the user name
     if (GetUserNameA(userName.ptr, &userNameSize)) {
         // Successfully retrieved the user name
         writeln("Logged-in user name: ", to!string(userName[0 .. 
userNameSize]));
     } else {
         // Failed to retrieve the user name
         int error = GetLastError();
         writeln("GetUserName failed with error code: ", error);
     }
}

```


Remember to link **advapi32.lib**
* `dmd WindowsGetUserName.d -Ladvapi32.lib`
* `rdmd -Ladvapi32.lib WindowsGetUserName.d`


Remember to include `pragma` into your source code and specify 
`advapi32.lib`

```
import std.stdio;
import core.sys.windows.windows;
import std.conv;

pragma(lib, "advapi32.lib");


void main() {
     char[256] userName; // Buffer to store the user name

     DWORD userNameSize = userName.length; // Size of the buffer

     // Call GetUserName to retrieve the user name
     if (GetUserNameA(userName.ptr, &userNameSize)) {
         // Successfully retrieved the user name
         writeln("Logged-in user name: ", to!string(userName[0 .. 
userNameSize]));
     } else {
         // Failed to retrieve the user name
         int error = GetLastError();
         writeln("GetUserName failed with error code: ", error);
     }
}

```