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.486 ; create 32 bit code
.model flat, stdcall ; 32 bit memory model
option casemap :none ; case sensitive
; include files
; ~~~~~~~~~~~~~
include \masm32\include\windows.inc
include \masm32\include\masm32.inc
include \masm32\include\gdi32.inc
include \masm32\include\user32.inc
include \masm32\include\kernel32.inc
include \masm32\macros\macros.asm ; the macro file
; libraries
; ~~~~~~~~~
includelib \masm32\lib\masm32.lib
includelib \masm32\lib\gdi32.lib
includelib \masm32\lib\user32.lib
includelib \masm32\lib\kernel32.lib
.data
ScreenhDC dd 0
ScreenW dd 0
ScreenH dd 0
CenterX dd 0
CenterY dd 0
.data?
hInstance dd ?
.code
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start:
push SM_CXSCREEN
call GetSystemMetrics
shr eax, 2
mov ScreenW, eax
push SM_CYSCREEN
call GetSystemMetrics
shr eax, 2
mov ScreenH, eax
push 0
call GetDC
mov ScreenhDC, eax
push SRC_INVERT
push 200
push ScreenW
push ScreenhDC
push 200
push 200
push 0
push 0
push ScreenhDC
call BitBlt
end start
im not sure why but i dont think im getting any values. im using bitblt to test to make sure that its working. i can use any immediate numbers in the bitblt call and it will work. if i use the variables it doesn't work.
the few times that it has worked xp ask me if i want to send an error message.
y does it do that
What do the magic numbers mean?
You should use the defined values in Windows.inc, it makes the code readable. It's too much hassle to work out what the values you are actually pushing mean.
Mirno
I don't understand, but if You trminate process, Windows didn't send error message.
Use:
invoke ExitProcess,NULL
I've just tried that and it all works fine.. but possbily for two corrections
- add invoke ExitProcess, NULL at the end (as joe said), just to tell windows this is the end of the program
- what is the value of "SRC_INVERT"?? -- should it be "SRCINVERT"??
The error message means the program did something bad and caused an exception -- removing the call to exit process causes this every time i've tried it :bdg
ok yeah thanks. and yes SRC_INVERT is suppose to be SRCINVERT i guess from me being use to vb i typed it that way.
how do i go about recieving the windows system messages without having a window.
i added the following code to the program and it takes it so long to load
in the data section
Time SYSTEMTIME <>
in the code section
push Time
Call GetSystemTime
I think you can do a standard message loop without a window - the thread should still receive messages in its queue; just make sure you set the window handle to NULL for the GetMessage function (since you don't have a window handle.)
I have no idea why GetSystemTime should take very long to execute, though it might help if you actually push OFFSET Time rather than the 'value' of Time :wink (For me it just crashes like that anyway.)
At this point I would suggest you try to use the invoke macro, which will actually pick up errors like that for you, as well as making the code easier to read.
invoke GetSystemTime, OFFSET Time
invoke GetSystemMetrics, SM_CXSCREEN
shr eax, 2
mov ScreenW, eax
invoke GetSystemMetrics, SM_CYSCREEN
shr eax, 2
mov ScreenH, eax
invoke GetDC, 0
mov ScreenhDC, eax
invoke BitBlt, ScreenhDC,0,0,200,200,ScreenhDC,ScreenW,200,SRCINVERT
invoke ExitProcess, NULL