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(Unicode C) SFTP Upload Large File in PartsSee more SFTP ExamplesDemonstrates how to split a large file into N parts and then upload each part separately. This technique can be used to potentially avoid limits a SFTP server might impose on upload file size.
#include <C_CkSFtpW.h> #include <C_CkFileAccessW.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkSFtpW sftp; const wchar_t *hostname; int port; BOOL success; const wchar_t *handle; const wchar_t *localFilePath; HCkFileAccessW fac; int blockSize; int numBlocks; HCkBinDataW bd; int i; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. sftp = CkSFtpW_Create(); // Set some timeouts, in milliseconds: CkSFtpW_putConnectTimeoutMs(sftp,5000); CkSFtpW_putIdleTimeoutMs(sftp,10000); // Connect to the SSH server. // The standard SSH port = 22 // The hostname may be a hostname or IP address. hostname = L"sftp.example.com"; port = 22; success = CkSFtpW_Connect(sftp,hostname,port); if (success != TRUE) { wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp)); CkSFtpW_Dispose(sftp); return; } // Authenticate with the SSH server. Chilkat SFTP supports // both password-based authenication as well as public-key // authentication. This example uses password authenication. success = CkSFtpW_AuthenticatePw(sftp,L"myLogin",L"myPassword"); if (success != TRUE) { wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp)); CkSFtpW_Dispose(sftp); return; } // After authenticating, the SFTP subsystem must be initialized: success = CkSFtpW_InitializeSftp(sftp); if (success != TRUE) { wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp)); CkSFtpW_Dispose(sftp); return; } // Open a remote file for writing on the SSH server. // If the file already exists, it is overwritten. // (Specify "createNew" instead of "createTruncate" to // prevent overwriting existing files.) handle = CkSFtpW_openFile(sftp,L"big.zip",L"writeOnly",L"createTruncate"); if (CkSFtpW_getLastMethodSuccess(sftp) != TRUE) { wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp)); CkSFtpW_Dispose(sftp); return; } // We're going to upload the local file "qa_data/zips/big.zip" (a relative local path from our current working directory) // to the SFTP server. localFilePath = L"qa_data/zips/big.zip"; // Rather than uploading in one shot, we'll read the local file in chunks // and upload a chunk at a time. fac = CkFileAccessW_Create(); success = CkFileAccessW_OpenForRead(fac,localFilePath); if (success == FALSE) { CkSFtpW_CloseHandle(sftp,handle); wprintf(L"%s\n",CkFileAccessW_lastErrorText(fac)); CkSFtpW_Dispose(sftp); CkFileAccessW_Dispose(fac); return; } // If we were to split the local file into 128K chunks, how many chunks (blocks) would // we have, including the last partial block? blockSize = 131072; numBlocks = CkFileAccessW_GetNumBlocks(fac,blockSize); wprintf(L"Number of blocks = %d\n",numBlocks); bd = CkBinDataW_Create(); i = 0; while (i < numBlocks) { // Read the Nth block, which gets appended to the bd. (which means // we must clear the contents of bd before the next iteration) success = CkFileAccessW_ReadBlockBd(fac,i,blockSize,bd); if (success == FALSE) { CkSFtpW_CloseHandle(sftp,handle); wprintf(L"%s\n",CkFileAccessW_lastErrorText(fac)); CkSFtpW_Dispose(sftp); CkFileAccessW_Dispose(fac); CkBinDataW_Dispose(bd); return; } // Upload this block to the open remote file. success = CkSFtpW_WriteFileBd(sftp,handle,bd); if (success == FALSE) { wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp)); CkSFtpW_Dispose(sftp); CkFileAccessW_Dispose(fac); CkBinDataW_Dispose(bd); return; } // Clear the contents for the next iteration. CkBinDataW_Clear(bd); i = i + 1; } // Close the local file. CkFileAccessW_FileClose(fac); // ----------------------------------------------------------------------------- // This is important. You must close the handle on the server. // Otherwise open handles will accumulate on the server until eventually a limit // is reached and the server will fail on a call to OpenFile. // ----------------------------------------------------------------------------- // Close the remote file handle on the server. success = CkSFtpW_CloseHandle(sftp,handle); if (success != TRUE) { wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp)); CkSFtpW_Dispose(sftp); CkFileAccessW_Dispose(fac); CkBinDataW_Dispose(bd); return; } wprintf(L"Success.\n"); CkSFtpW_Dispose(sftp); CkFileAccessW_Dispose(fac); CkBinDataW_Dispose(bd); } |
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