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OrbWorks Community Forum • View topic - Adding and subtracting dates

Adding and subtracting dates

Discuss topics that apply across the products, such as the PocketC language, or development in general

Postby FrappyDan on Mon Dec 30, 2002 3:57 am

In java there was a method to add and subtract dates. If I have a date in a systemdatepicker, to say page through days, how would I say subtract 8 days or 10 days from the date in the box and not come up with something like feb 31st. So to speak...

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Postby guy on Mon Dec 30, 2002 11:51 am

Use a DTM_GETSYSTEMTIME message to get the date out of the date/time picker and into a real memory array (the opposite of setting the date/time).

Allocate enough real memory for a FILETIME structure (two LONGS).

Call the function SystemTimeToFileTime() passing it the address of the SYSTEMTIME structure in real memory and the address of the FILETIME structure in real memory.

The FILETIME structure in memory now contains a 64 bit number representing the time since 1st January 1601 in 100 nanosecond intervals.

Perform a 64 bit addition or subtraction on the FILETIME structure using the appropriate number of 100 nanosecond intervals. I suggest that you do this 16 bits at a time in (32 bit) integers. You can then use the 0x00010000 bit of the result as the carry or borrow flag.

Call the FileTimeToSystemTime() function to convert the time back into a SYSTEMTIME.

Use the result for whatever you want.

The only small problem is that CEAPI doesn't provide direct access to the two time conversion functions. You can easily call them anyway by binding to them at runtime. Look at the stdcall.pc program supplied with CEAPI and the documentation in the CEAPI readme on the CEAPI_stdcall() function to see how to do this.

The function names to lookup using GetProcAddress() are "SystemTimeToFileTime" and "FileTimeToSystemTime". There is no name mangling required and you don't need to add a "W" or "A" to the end as you would for functions that have ASCII and UNICODE versions. Both functions are in "coredll.dll" which you need in the LoadLibrary() call.





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Guy
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Postby guy on Sat Jan 04, 2003 12:09 pm

If you want to test this before Monday 6th January then you will need to add dummy parameters to the end of any function with between one and three parameters that you call through CEAPI_stdcall(). ie Add extra int fields to the end of the parameters struct to make the number up to four, and set the parameter count to 4.

This will affect your calls to the date/time conversion functions.

Functions with no parameters and functions with four or more parameters can be called with no problems.

I will upload a new version of the library with the problem fixed between now and Monday afternoon. I'll post back here, or in the CE section of the board, once I've updated the library.




Guy
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Guy
[url]mailto:pcform@pcform.net[/url]
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