SignFile Method
Signs a file.
Syntax
int SignFile(const QString& qsSourceFile, const QString& qsDestFile, bool bDetached);
Remarks
Use this method to sign a file and save the protected message to another file.
Specify the signing key in Key property before the signing. Please make sure the assigned key has a private key associated with it.
Set Detached parameter to false to create an enveloped/enveloping signature. This maynot be supported by certain algorithms or encryption modes.
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.)