I want to make an application which can download email content by using command line. For example with gmail we can get email by execute following command in Command Promt:
(note you have to install openssl first)

Qt Code: 
  1. >opensslOpenSSL>s_client -connect pop.gmail.com:995
  2. Loading 'screen' into random state - done
  3. CONNECTED(00000168)
  4. depth=1 C = US, O = Google Inc, CN = Google Internet Authority
  5. verify error:num=20:unable to get local issuer certificate
  6. verify return:0
  7. ---
  8. Certificate chain
  9.  0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=pop.gmail.com
  10.    i:/C=US/O=Google Inc/CN=Google Internet Authority
  11.  1 s:/C=US/O=Google Inc/CN=Google Internet Authority
  12.    i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
  13. ---
  14. Server certificate
  15. -----BEGIN CERTIFICATE-----
  16. MIIDfjCCAuegAwIBAgIKVExoXgABAACEMTANBgkqhkiG9w0BAQUFADBGMQswCQYD
  17. VQQGEwJVUzETMBEGA1UEChMKR29vZ2xlIEluYzEiMCAGA1UEAxMZR29vZ2xlIElu
  18. dGVybmV0IEF1dGhvcml0eTAeFw0xMzA0MTUwODQ1MjVaFw0xMzEyMzExNTU4NTBa
  19. MGcxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMRYwFAYDVQQHEw1N
  20. b3VudGFpbiBWaWV3MRMwEQYDVQQKEwpHb29nbGUgSW5jMRYwFAYDVQQDEw1wb3Au
  21. Z21haWwuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJcFLd/CvEAEYb
  22. PComwfh/VJnV4I0AbErRIBztla7KdaOL3SN8a2lnKKZSkX9fhIMQ8mwCyZ8iWzLG
  23. aXaWr64uChCH2lQNA6O5B/kcLeBfWV51Fwqiq6aRQxpYY7sUqOP03oABRLtBiFOq
  24. wCCLLbkeEcjLuWzzebFk2HX6L++02wIDAQABo4IBUDCCAUwwHQYDVR0lBBYwFAYI
  25. KwYBBQUHAwEGCCsGAQUFBwMCMB0GA1UdDgQWBBS3kDe0ZShOJvpTHlTbh4fjZtVf
  26. lDAfBgNVHSMEGDAWgBS/wDDr9UMRPme6npH7/Gra42sSJDBbBgNVHR8EVDBSMFCg
  27. TqBMhkpodHRwOi8vd3d3LmdzdGF0aWMuY29tL0dvb2dsZUludGVybmV0QXV0aG9y
  28. aXR5L0dvb2dsZUludGVybmV0QXV0aG9yaXR5LmNybDBmBggrBgEFBQcBAQRaMFgw
  29. VgYIKwYBBQUHMAKGSmh0dHA6Ly93d3cuZ3N0YXRpYy5jb20vR29vZ2xlSW50ZXJu
  30. ZXRBdXRob3JpdHkvR29vZ2xlSW50ZXJuZXRBdXRob3JpdHkuY3J0MAwGA1UdEwEB
  31. /wQCMAAwGAYDVR0RBBEwD4INcG9wLmdtYWlsLmNvbTANBgkqhkiG9w0BAQUFAAOB
  32. gQA8MCOlbZZGyLz5byFAq6eFhNw74ahaKVW3QeskRkPUI7hkr37Kmoaq8PE9Oosk
  33. lewH6mgDjheUb6DJJhNhnmcgkAvLfyq0fdDKceSwpTbV5xjcKp3/0G0lzKSMxB7C
  34. oOzEcClsFNLx6EP4FsJS1ELJRGbop7xQF8Wz/5mr88HjFw==
  35. -----END CERTIFICATE-----
  36. subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=pop.gmail.com
  37. issuer=/C=US/O=Google Inc/CN=Google Internet Authority
  38. ---
  39. No client certificate CA names sent
  40. ---
  41. SSL handshake has read 2108 bytes and written 443 bytes
  42. ---
  43. New, TLSv1/SSLv3, Cipher is ECDHE-RSA-RC4-SHA
  44. Server public key is 1024 bit
  45. Secure Renegotiation IS supported
  46. Compression: NONE
  47. Expansion: NONE
  48. SSL-Session:
  49.     Protocol  : TLSv1.2
  50.     Cipher    : ECDHE-RSA-RC4-SHA
  51.     Session-ID: 8FD510E5074D67B5052E8B68171CD55FC14132282232B0D4A090CBC3248719BA
  52.  
  53.     Session-ID-ctx:
  54.     Master-Key: 1E0D5DCDD8DB167CCB2C8C3CCDDCE0CF65D41A3D49D113125376801C9706FDAC
  55. FCFBFB32A9A174FFE07AF0939D1BE122
  56.     Key-Arg   : None
  57.     PSK identity: None
  58.     PSK identity hint: None
  59.     SRP username: None
  60.     TLS session ticket lifetime hint: 100800 (seconds)
  61.     TLS session ticket:
  62.     0000 - bc 52 af c7 83 85 57 69-f4 c3 11 a5 de 03 b9 ce   .R....Wi........
  63.     0010 - c1 c7 5d 39 e3 6a d8 d2-fe 9d 8b 4a 1a 61 33 a8   ..]9.j.....J.a3.
  64.     0020 - 3a dc bd 79 b8 f7 ee 44-39 3d bb 24 1f 7a 6a 18   :..y...D9=.$.zj.
  65.     0030 - 0b b9 b5 99 7b ee 9a 15-3a 64 18 78 22 2e 04 5e   ....{...:d.x"..^
  66.     0040 - b3 6a e3 04 6e c3 52 d8-21 00 3d 3b a3 82 7d ca   .j..n.R.!.=;..}.
  67.     0050 - e5 3a e9 c6 4f d8 fa 46-77 4e 1c 2e 93 f3 22 81   .:..O..FwN....".
  68.     0060 - 02 fb cd 9e bc 56 9e a3-10 76 fe 3c 93 1b d6 33   .....V...v.<...3
  69.     0070 - 3a 6c 3c f9 96 81 4b 93-e6 84 01 eb 9e 4c 5d bd   :l<...K......L].
  70.     0080 - 42 b5 8b 4f 9c 27 a5 f8-4d f9 23 c8 cb cd 91 78   B..O.'..M.#....x
  71.     0090 - 58 8b 40 b4                                       X.@.
  72.  
  73.     Start Time: 1374828368
  74.     Timeout   : 300 (sec)
  75.     Verify return code: 20 (unable to get local issuer certificate)
  76. ---
  77. +OK Gpop ready for requests from 113.161.80.171 w3pf6487545pbz.26
  78. USER <your gmail acount>
  79. +OK send PASS
  80. PASS <your gmail password>
  81. +OK Welcome. LIST //show list of mails
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I want to create an application to run these command automatically and get the final result. My code:

Qt Code: 
  1. process = new QProcess(this);
  3. process->setProcessChannelMode(QProcess::MergedChannels);
  4. args << "s_client" << "-connect" << "pop.gmail.com:995";
  5. process->start("openssl", args);
  6. process->waitForStarted();
  7. process->write("USER <username>\n");
  8. process->write("PASS <password>\n");
  9. process->write("LIST\n");
  10.  QString output = process->readAll();
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But the output I get just is:

Qt Code: 
  1. Loading 'screen' into random state -CONNECTED(00000174)---
  2. Certificate chain
  3.  0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=pop.gmail.com
  4.    i:/C=US/O=Google Inc/CN=Google Internet Authority
  5.  1 s:/C=US/O=Google Inc/CN=Google Internet Authority
  6.    i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
  7. ---
  8. Server certificate
  9. -----BEGIN CERTIFICATE-----
  10. MIIDfjCCAuegAwIBAgIKVExoXgABAACEMTANBgkqhkiG9w0BAQUFADBGMQswCQYD
  11. VQQGEwJVUzETMBEGA1UEChMKR29vZ2xlIEluYzEiMCAGA1UEAxMZR29vZ2xlIElu
  12. dGVybmV0IEF1dGhvcml0eTAeFw0xMzA0MTUwODQ1MjVaFw0xMzEyMzExNTU4NTBa
  13. MGcxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMRYwFAYDVQQHEw1N
  14. b3VudGFpbiBWaWV3MRMwEQYDVQQKEwpHb29nbGUgSW5jMRYwFAYDVQQDEw1wb3Au
  15. Z21haWwuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJcFLd/CvEAEYb
  16. PComwfh/VJnV4I0AbErRIBztla7KdaOL3SN8a2lnKKZSkX9fhIMQ8mwCyZ8iWzLG
  17. aXaWr64uChCH2lQNA6O5B/kcLeBfWV51Fwqiq6aRQxpYY7sUqOP03oABRLtBiFOq
  18. wCCLLbkeEcjLuWzzebFk2HX6L++02wIDAQABo4IBUDCCAUwwHQYDVR0lBBYwFAYI
  19. KwYBBQUHAwEGCCsGAQUFBwMCMB0GA1UdDgQWBBS3kDe0ZShOJvpTHlTbh4fjZtVf
  20. lDAfBgNVHSMEGDAWgBS/wDDr9UMRPme6npH7/Gra42sSJDBbBgNVHR8EVDBSMFCg
  21. TqBMhkpodHRwOi8vd3d3LmdzdGF0aWMuY29tL0dvb2dsZUludGVybmV0QXV0aG9y
  22. aXR5L0dvb2dsZUludGVybmV0QXV0aG9yaXR5LmNybDBmBggrBgEFBQcBAQRaMFgw
  23. VgYIKwYBBQUHMAKGSmh0dHA6Ly93d3cuZ3N0YXRpYy5jb20vR29vZ2xlSW50ZXJu
  24. ZXRBdXRob3JpdHkvR29vZ2xlSW50ZXJuZXRBdXRob3JpdHkuY3J0MAwGA1UdEwEB
  25. /wQCMAAwGAYDVR0RBBEwD4INcG9wLmdtYWlsLmNvbTANBgkqhkiG9w0BAQUFAAOB
  26. gQA8MCOlbZZGyLz5byFAq6eFhNw74ahaKVW3QeskRkPUI7hkr37Kmoaq8PE9Oosk
  27. lewH6mgDjheUb6DJJhNhnmcgkAvLfyq0fdDKceSwpTbV5xjcKp3/0G0lzKSMxB7C
  28. oOzEcClsFNLx6EP4FsJS1ELJRGbop7xQF8Wz/5mr88HjFw==
  29. -----END CERTIFICATE-----
  30. subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=pop.gmail.com
  31. issuer=/C=US/O=Google Inc/CN=Google Internet Authority
  32. ---
  33. No client certificate CA names sent
  34. ---
  35. SSL handshake has read 2108 bytes and written 443 bytes
  36. ---
  37. New, TLSv1/SSLv3, Cipher is ECDHE-RSA-RC4-SHA
  38. Server public key is 1024 bit
  39. Secure Renegotiation IS supported
  40. Compression: NONE
  41. Expansion: NONE
  42. SSL-Session:
  43.     Protocol  : TLSv1.2
  44.     Cipher    : ECDHE-RSA-RC4-SHA
  45.     Session-ID: 1C7F9F41B28351AE9C0BD65EC9A235559EE944EDCA6EC30F1D9D3BE12C540B91
  46.     Session-ID-ctx: 
  47.     Master-Key: F4EEF91B5CF9ADC303E544D973A8E804E2E47989B269633B2FE8D02FA68D93269B34F1959C444C228B2481C6EDAC6516
  48.     Key-Arg   : None
  49.     PSK identity: None
  50.     PSK identity hint: None
  51.     SRP username: None
  52.     TLS session ticket lifetime hint: 100800 (seconds)
  53.     TLS session ticket:
  54.     0000 - bc 52 af c7 83 85 57 69-f4 c3 11 a5 de 03 b9 ce   .R....Wi........
  55.     0010 - 75 27 65 b9 8a fd 34 3e-58 7b ea 25 01 ea d9 3a   u'e...4>X{.%...:
  56.     0020 - 84 50 15 9e da d1 f6 a5-3f 7a b9 02 29 67 e3 64   .P......?z..)g.d
  57.     0030 - 6c f9 1e a9 e7 75 11 fe-af f8 3b 91 7d bc cf ab   l....u....;.}...
  58.     0040 - cb f0 8f 00 4f b7 a2 a4-e0 06 4f 25 da a9 8e e2   ....O.....O%....
  59.     0050 - 9c 55 f7 4c b4 a7 e2 cd-3c f9 6b 1f bf ec ab c3   .U.L....<.k.....
  60.     0060 - d5 a8 8d a3 dc 0f 26 e1-38 39 e6 2b bb 71 40 8d   ......&.89.+.q@.
  61.     0070 - 95 1e 3a 71 6a fa 64 84-2b 42 92 36 f3 fb 93 b3   ..:qj.d.+B.6....
  62.     0080 - ba ec 6f e5 48 50 ea 6f-23 4d 2b 5b f4 9c 8a 58   ..o.HP.o#M+[...X
  63.     0090 - 31 24 b5 c0                                       1$..
  64.  
  65.     Start Time: 1374828292
  66.     Timeout   : 300 (sec)
  67.     Verify return code: 20 (unable to get local issuer certificate)
  68. --- +OK Gpop ready for requests from 113.161.80.171 on1pf6530043pbc.6
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This means the lines from USER have not been executed. It seems to be in a session while waiting for USER and PASS after "+OK Gpop ready for requests from 113.161.80.171 on1pf6530043pbc.6" line and our current QProcess can not write anything into. Anyone can help me on this? I am e newbie in Qt so I do not know much about QProcess.