DecryptFile Method
Decrypts a file.
Syntax
int DecryptFile(const QString& qsSourceFile, const QString& qsDestFile);
Remarks
Use this method to decrypt an encrypted file and save the decrypted data to another file.
Specify the decryption key in Key property before calling this method.
Error Handling
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)