Xceed Zip for COM/ActiveX on x86/x64 Documentation
Direct DLL API / DLL API event parameter structure reference / xcdWritingZipContentsStatusParams structure
xcdWritingZipContentsStatusParams structure

typedef struct _xcdWritingZipContentsStatusParams
{
   const SHORT nFilesPercent; 
} xcdWritingZipContentsStatusParams; 

This structure is available in both ANSI and UNICODE versions.