checksum

问题 Made a simple batch script to create a .sfv for each file within the folder. I'm far from being a coder but I patched this together from various sites and made it work: for %%f in (*) do (cfv -C -f"%%f".sfv -tsfv "%%f") The issue is, if I run this batch file more than once, existing files get checked again and a separate .sfv file is created as a *.sfv.sfv Just wondering, how can this be written to ignore checking a file/writing a new .sfv if a .sfv exists? Thank you! Edit: I tried the

问题 I'm using WinSCP .NET assembly in my C# WinForms application and I want to synchronize my remote directory with my local directory. This works great with WinSCP. But before the synchronisation starts, I want to check if the remote and the locale directors are different at all. To do this, I want to use the CalculateFileChecksum() method from WinSCP. Here is an example for what I'm trying to do. And here is the code, where I call the method: var checksum = session.CalculateFileChecksum("md5",

问题 I'm using WinSCP .NET assembly in my C# WinForms application and I want to synchronize my remote directory with my local directory. This works great with WinSCP. But before the synchronisation starts, I want to check if the remote and the locale directors are different at all. To do this, I want to use the CalculateFileChecksum() method from WinSCP. Here is an example for what I'm trying to do. And here is the code, where I call the method: var checksum = session.CalculateFileChecksum("md5",

问题 The documentation for DownloadTemporaryFile says this about the RequiredSHA256OfFile parameter: If RequiredSHA256OfFile is set it will compare this to the SHA-256 of the downloaded file and raise an exception if the hashes don't match. An exception will be raised if there was an error. Otherwise, returns the number of bytes downloaded. Returns 0 if RequiredSHA256OfFile is set and the file was already downloaded. From the answer here I have determined that the correct commandline method to

问题 The documentation for DownloadTemporaryFile says this about the RequiredSHA256OfFile parameter: If RequiredSHA256OfFile is set it will compare this to the SHA-256 of the downloaded file and raise an exception if the hashes don't match. An exception will be raised if there was an error. Otherwise, returns the number of bytes downloaded. Returns 0 if RequiredSHA256OfFile is set and the file was already downloaded. From the answer here I have determined that the correct commandline method to

问题 I've been looking for the equivalent python method for the unix cksum command: http://pubs.opengroup.org/onlinepubs/7990989775/xcu/cksum.html $ cksum ./temp.bin 1605138151 712368 ./temp.bin So far I have found the zlib.crc32() function >>> import zlib >>> f = open('./temp.bin','rb') >>> data = f.read() >>> zlib.crc32(data) 1128751837 However this code appears to produce different results. As far as I can tell this should be using the same crc polynomial but I imagine there must be some

问题 I have the following in Postgres 9.2.4: postgres=# SELECT CHECKSUM(O_ORDERKEY) FROM tpch.orders; checksum -------------------- 322119959934139382 (1 row) Time: 41437.050 ms I have an instance of Oracle 11g database, with the same TPCH data, which I want to check consistency with the Postgres instance by comparing table checksums. From this link https://docs.oracle.com/en/database/oracle/oracle-database/20/sqlrf/checksum.html#GUID-3F55C5DF-F23A-4B2F-BC6F-E03B34B78BA8 I found out that CHECKSUM

问题 I have two databases for logging stuff, which I want to check for synchronization. The solution approved is to send periodically (lets say hourly) a select to both, generate a hash of the result set and compare them. If they match then great, otherwise generate some alarms. Currently I'm doing it by (bash script): log_table="SELECT column1, column2, column3 FROM log_table where to_char(timestamp, '$ts_format') = '$tx_moment'"; PSQL="psql -t -q -h $_gp_host -U $_gp_user -d log_schema -c ";

问题 I had some contact with the CRC-16 checksum in the past and was accustomed to verifying it by recalculating the CRC-16 checksum over the file I want to verify, plus the 2 bytes of the CRC-16 itself. If the result was zero, then the file integrity was valid, otherwise not. This can be coded very efficiently like with the following pseudo-C: if (recalculated_crc16_checksum != 0) // Error: file integrity is corrupt else // Success: file integrity is valid I recently wanted to use the CRC-32

问题 I'm trying to use Miniconda3 to create an environment and install packages to it. Here is my current process: Open Miniconda3 prompt conda create --name env conda activate env conda install h5py Here is the output: Downloading and Extracting Packages hdf5-1.10.4 | 7.9 MB | | 0% etc.... ChecksumMismatchError: Conda detected a mismatch between the expected content and downloaded content for url 'https://repo.anaconda.com/pkgs/main/win-64/hdf5-1.10.4-h7ebc959_0.conda'. download saved to: C: