problem with signature verify again

[d_well@isuisse.com]

I have a problem when I will verify a signature. I
have signed a message with the command "gpgme_op_sign
(GCtx, in, out, GPGME_SIG_MODE_CLEAR );" and after I
verify with the command "gpgme_op_verify (GCtx, sig,
text, &status );"
The variable "in" and "text" are the same.
And I take the signature part of the variable "out"
and I put that in the variable "sig".

Exemple of variable "sig" :

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)

iEYEARECAAYFAj24FOoACgkQLXJ8x2hpdzTQygCdGUpZghMIU0iRa
9nSjvhBk3YY
+ZMAnRYr+bnObi+NnTRx5KXnW+Z3Pdw/
=3DgbrJ
-----END PGP SIGNATURE-----

Everytime I have the Error message "Verification
Status: No Signature". How must do to have a good
result when I verify a signature.