Delete a key from keyring, using gpgme

[Vit Sykacek]

Hello, 
 
I'm using gpgme to use some functions of gpg in my code. 
All other functions are working good, but deleting of key  
doesn't work. It returns gpgme_no_error, but key stays in  
keyring. Here's line of my code: 
 
err = gpgme_op_delete(ctx, key, 1); 
 
Context and key are not null. Does anyone know, where  
is the prob ? 
 
Vit