UpdateFile Method

Feeds the contents of a file to the hash function.

Syntax

• C++
• Objective-C
• C

ANSI (Cross Platform)
int UpdateFile(const char* lpszSourceFile);

Unicode (Windows)
INT UpdateFile(LPCWSTR lpszSourceFile);

- (void)updateFile:(NSString*)sourceFile;

#define MID_HASHFUNCTION_UPDATEFILE 9

SECUREBLACKBOXLITE_EXTERNAL int SECUREBLACKBOXLITE_CALL SecureBlackboxLite_HashFunction_Do(void *lpObj, int methid, int cparam, void *param[], int cbparam[], int64 *lpllVal);

Remarks

Call this method to pass the contents of a file to the hash function. You can call this function repeatedly and mix it with Update to feed the hash function with many separate chunks of data.

Remember to initialize the hash function with an Reset call before starting hashing the data. Once all the data chunks have been submitted, finalize the hash function and obtain the resulting message digest by calling Finish.

Error Handling (C++)

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.)