One or more of the following flags:. The lpszDate parameter can take a variety of formats. Zero if the value of this COleDateTime object was set successfully; otherwise, 1.
This return value is based on the DateTimeStatus enumerated type. For more information, see the SetStatus member function. A day value of zero indicates the last day of the previous month. If the date value specified by the parameters is not valid, the status of this object is set to COleDateTime::invalid.
For information on member functions that query the value of this COleDateTime object, see the following member functions:. If the date or time value specified by the parameters is not valid, the status of this object is set to invalid and the value of this object is not changed. This function is for advanced programming situations. This function does not alter the data in this object. It will most often be used to set the status to null or invalid. If the time value specified by the parameters is not valid, the status of this object is set to invalid and the value of this object is not changed.
Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Returns the year, based on local time, in the range January 1,, to January 18, inclusive.
This overloaded assignment operator copies the source time into this CTime object. The internal time storage in a CTime object is independent of time zone. Time zone conversion is not necessary during assignment. CTime objects represent absolute time, CTimeSpan objects represent relative time. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No.
Any additional feedback? In particular, you should avoid as much as possible to depend on versions, and check for capabilities instead. Checking for versions quickly leads to complicated, interleaved conditionals, whereas with the technique above, everything is controlled from one config. In scons and cmake, they will have tests which are run automatically to check whether the function is available, and define the variable in the config. Note that this can handle cases where you need to build binaries which run on different platforms say run on XP even if built on Vista.
It is just a matter of changing the config. If dones poperly, that's just a matter of changing the config. I don't think it is specific to unix at all. Previous answers have pointed out checking for the particular define that would be present for your particular case.
This answer is for a more general case of compiling different code whether a function is available or not. Rather than trying to do everything in the C file itself, this is the sort of thing where configure scripts really shine. A simple and very very ugly script that could work if you have sh handy I don't have a Windows setup handy to test this on would look something like this:.
This should be easy enough to translate into your scripting language of choice. If your program requires extra include paths, compiler flags, or whatever, make sure to add the necessary flags to both the test compile and the real compile.
Is it possible to write a template to check for a function's existence? You need to determine at runtime which operating system you are running and then call the correct function. In general both calls need to be in the code. I would also point out that maybe GetTickCount isn't the right thing to use at all. The docs say it returns a number of milliseconds, but in reality the precision of the function isn't even close to 1 millisecond.
Depending on the machine and there's no way to know at runtime AFAIK the precision could be 40 milliseconds or even more. If you need 1 millisecond precision you should be using QueryPerformanceCounter. If it is then you're running Vista. Edit: For the semantic pecker head, I meant running a compiler in a Vista environment. The question only refers to compiling, the question only refers to header files which are only used at compile time.
Most people understood that it was intended that you're compiling in a Vista env. The question made no reference to runtime behaviour. Add your solution here.
OK Paste as. Treat my content as plain text, not as HTML. Existing Members Sign in to your account. This email is in use. Do you need your password? Submit your solution! When answering a question please: Read the question carefully. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question. Let's work to help developers, not make them feel stupid.
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