VirtualAlloc is pretty straight forward to use, you simply pass in the desired address or NULL , if you are fine with the decision of the OS , size as a multiple of dwAllocationGranularity and flags and you get back the address of the newly allocated memory region. CreateFileMapping is a little more complicated, since it's actual purpose is to map files on disk to memory.
The resulting file handle has to be mapped with MapViewOfFile. Since Windows does not support overcommitting, unlike Linux, all allocated memory, regardless of method, must always be backed by either the swap file [1] or physical memory.
Now that we know how to map memory on Windows, let's look into unmapping. Contrary to any logic, there are four, not just two, ways of unmapping:.
One might think that all function somewhat similar. Either of the three ways should technically only change a couple of bits in some data structure in the kernel. I use it all the time. Very useful to have on my phone. I can't tell you how often it has saved us.
Thanks memory map. Feedback I use a black view phone with its huge battery. I get easily four days in the mountains without a recharge. This app is absolutely fabulous with that potential. To turn off the alarm, either turn down the volume control of the computer, or double-click the mark, and un-check the "Visible" property to hide the mark.
The map is resized to fill the width or height of the printed page. If you want to print with the page vertical portrait , resize the window so it has an aspect ratio similar to the page. The image is sent to printer at a much higher resolution than it is shown on the screen, so you will be able to take advantage of the full resolution of the printer.
See Printing. Given the vagaries of windows printer drivers, it is not a good idea to use the printed maps for navigation. There is no guarantee that the aspect ratio is correct, and this affects the accuracy of plotted bearings. It is possible that the ink may run when a few drops of water get on the page, making the map unusable just when you need it most.
Always carry a proper printed map designed for the activity you are undertaking. Just press the space bar or the Alt toolbar button to show the alternate view of the map. You can scroll and zoom the alternate view just like the normal view, and press the space bar or the Alt button again to switch back. The blue rectangle in the zoomed out view shows the area of the screen in the zoomed in view. It you want to show the normal view and overview side by side, right click on the map to open the popup menu, and select Maps at Cursor.
If the display appears to flicker or scrolling performance becomes sluggish, it is possible that you have collected a track log containing millions of points that is taking a long time to re-draw.
This will occur even if the track is way off-screen, and you can easily fix it by deleting the track or making it invisible. To prevent the track log from getting as large again, you can set the minimum time and the minimum distance between consecutive points to the level of detail you need. Change these parameters in the Track Properties dialog Aim to keep your logs under points and you should have no trouble.
Memory-Map Navigator conveniently allows you to email routes, marks, tracks, or your current position to another user. This is a great way to keep others up to date with your voyage or expedition. You could send data to other parties travelling with you or to friends and relatives at home.
The email recipient will need a copy of Memory-Map Navigator the free map viewer is sufficient and suitable digital maps or charts to view the data. To email a single object, right-click on the object and select "Send by email".
The data is exported into an "MMO" file, and sent to your default email application as an attachment.
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