how does the invoke macro allow

invoke MessageBox,HWND_DESKTOP,"some text in quotes", "and more",MB_OK

im new to assembly and dont understand the stack, and what to do in a standard call function.
i have read about how they use the stack and whether the caller clears the stack but do not understand what to do.

i also dont understand how the invoke macro can use text, as i have usually had a global string variable and "push string_var_name" then call the function

is it possible to set a string variables contents aswell but not in the declaration ?

in data section
mystring db "this is my string", 0

is it possible to do
mystring rb 16 ; 16 bytes buffer

then mystring = "this is my string"
or something similar ?

only simple calls can't be used with params



equal to:



if you want to use string you must operate with him address





yes, it is possible, you can use lstrcpy function (copy string to a buffer)



after this, you have mystring="this is my string"

Vjacheslav, any call macroses (stdcall, invoke, cinvoke, etc.) can be used without parameters. They are macroses, so you can check, whether there are any parameters passed, and if it isn't, make only appropriate call.
In fasm package stdcall (or invoke - I don't remember exactly) doesn't work without params, but you can easily fix it by yourself.
Best regards.

yes, you right