Draw a pixel to the screen in x86-64 assembly

Asked Nov 07 '19 at 20:20

Active Nov 07 '19 at 20:29

Viewed 318 times

I've been trying to draw even 1 pixel to the screen in x86-64 assembly with masm visual studio

I've found online that you can use int 10h to make the screen into 320x200 256 color mode but when i try to use this i get an error

Exception thrown at 0x00007FF6F2341014 in assemblyproject.exe: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.

and i cant make this go away

I've also found that 0xA0000h is the location in memory to draw to the screen but when i try to write there i get another error

Exception thrown at 0x00007FF7A4AF101F in assemblyproject.exe: 0xC0000005: Access violation writing location 0x00000000000A0000.

i have tried for multiple days to make this work but i have not even gotten 1 pixel onto the screen and i don't know what more i can do or how to fix anything

I'm using windows 10 operating system

edited Nov 07 '19 at 20:29

Ross Ridge

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asked Nov 07 '19 at 20:20

Nathaniel Smith

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You can use BIOS interfaces (`int 10h`) under Windows. You'll have to use the same Windows API calls that you would use in a C or C++ program. – Ross Ridge Nov 07 '19 at 20:30
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@RossRidge You surely mean “You cannot use BIOS interfaces...” – fuz Nov 07 '19 at 21:01
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Sorry, yes. I meant that you cannot use BIOS interfaces under Windows. – Ross Ridge Nov 07 '19 at 21:05
can you call the windows API calls directly from assembly or do you have to do it from c, because my program has no c only assembly – Nathaniel Smith Nov 07 '19 at 21:31
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@NathanielSmith - no different from asm, c,c++ or another language you call api – RbMm Nov 07 '19 at 21:38

Draw a pixel to the screen in x86-64 assembly

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