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- Error handling
- Operating mode in Windows Vista (and later)
- Encrypting/Decrypting a character string
- Encryption in PHP
- Encryption in Android/Java and decryption by a WINDEV application (or conversely)
fDecrypt (Function) In french: fDécrypte
Warning
From version 24, fUncrypt is kept for backward compatibility. This function has been replaced with fDecrypt.
Decrypts a file that was encrypted by fEncrypt.
Syntax
<Result> = fDecrypt(<Path of file to decrypt> , <Path of decrypted file> , <Password> [, <Type of encryption used> [, <Format of encrypted file>]])
<Result>: Boolean - True if the decryption has been completed,
- False otherwise. To get more details on the error, use ErrorInfo with the errMessage constant.
<Path of file to decrypt>: Character string Name and full (or relative) path of the file to decrypt (up to 260 characters). A UNC path can be used. This file must have been encrypted by fEncrypt.
<Path of decrypted file>: Character string Name and full (or relative) path of the decrypted file (up to 260 characters). A UNC path can be used. <Password>: Character string or Secret string Password used to decrypt the file. This password must be identical to the password used to encrypt the file. A long password provides better encryption security.
New in version 2025Secret strings: If you use the secret string vault, the type of secret string used for this parameter must be "Ansi or Unicode string". To learn more about secret strings and how to use the vault, see Secret string vault. <Type of encryption used>: Optional constant Specifies the type of encryption used. This parameter must be identical to the one specified during the encryption. | | cryptFast (Default value) | Priority was given to the encryption speed (algorithm on 128 bits).
| cryptNone | No encryption was performed. | cryptRC516 | Priority is given to the encryption security (RC5 algorithm on 16 rounds).
| cryptSecure | Priority was given to the encryption security (RC5 algorithm on 128 bits).
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<Format of encrypted file>: Optional Integer constant Specifies the format of the encrypted file. This parameter must be identical to the one specified during the encryption. | | encodeBASE64 | BASE 64 format. The encrypted file will contain printable characters only. | encodeNone or False (Default value) | Binary format. The encrypted file may contain non-printable characters. | encodePCS or True | ASCII format. The encrypted file will contain printable characters only. | encodeUUEncode | UUEncode format. The encrypted file will contain printable characters only. |
Remarks Error handling fDecrypt throws an error in the following cases: - the file to decrypt does not exist or it is locked,
- the path of the file to decrypt is invalid,
- the <Password> is an empty string or it differs from the <Password> used to encrypt the file,
- the <Type of encryption used> differs from the <Type of encryption> specified during the encryption,
- the <Format of encrypted file> differs from the one specified during the encryption,
- the user has no read rights on the file to decrypt,
- the user has no write rights on the file to decrypt.
- a Unicode string was used for the <Path of file to decrypt> or for the <Path of decrypted file> in an operating system such as Windows 98 or Windows Me.
Encrypting/Decrypting a character string
Related Examples:
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Unit examples (WEBDEV): The encryption functions
[ + ] This example explains how to use the encryption/decryption functions of WEBDEV. This example allows you to: - Encrypt a character string - Decrypt a character string
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Unit examples (WINDEV): The encryption functions
[ + ] Using the encryption/decryption functions of WINDEV. This example is used to: - Encrypt a character string - Decrypt a character string
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Unit examples (WINDEV Mobile): The encryption functions
[ + ] Using the WLanguage encryption and decryption functions. This example is used to: - Encrypt a character string - Decrypt a character string
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