Ramblings...

[sinsi]

In VB you could have code like this

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  If FunctionThatReturnsAnInteger(arg) then
    DoSomethingWhenTrue
  Else
    DoAnotherThingWhenFalse
  End IfThe missing code is implied If FunctionThatReturnsAnInteger(arg) <> 0

False = 0
True = non-zero

But we also have to take into account the size of what we're testing. For example, RegisterClassEx returns an ATOM (16-bit unsigned) but how many of use this code to check for success?

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  test eax,eax ;should be test ax,ax ?
  jz failedHow does C/C++ test for failure with this function?

[sinsi]

does that mean always when being accused of post ramblings anywhere in forum,Stoo needs to move the rambling posts here ?:)

Get off my lawn!

[daydreamer]

does that mean always when being accused of post ramblings anywhere in forum,Stoo needs to move the rambling posts here ?:)

Get off my lawn!

reminds me off old dos game "Red Neck Rampage" enemies walks around -"get off my lawn!" :)

[sinsi]

reminds me off old dos game "Red Neck Rampage" enemies walks around -"get off my lawn!" :)

Ah yes, the cheerleaders in the school bus complaining how "nipply" the weather was 

[TimoVJL]

Create a traditional Windows Desktop application (C++) Benny Hill

[sinsi]

https://learn.microsoft.com/en-sg/answers/questions/1650648/create-a-traditional-windows-desktop-application-

OK, let me rephrase my question.

How does the disassembly of C/C++ code show the test for failure with this function?

[TimoVJL]

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test ax, ax

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00000071  8D45D0                  lea eax, [ebp-30h]
00000074  50                      push eax
00000075  FF1500000000            call dword ptr [__imp__RegisterClassExA@4]
0000007B  6685C0                  test ax, ax
0000007E  7507                    jnz L_87
00000080  31C0                    xor eax, eax
00000082  E98B000000              jmp L_112


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000000AF  488D8C2490000000         lea rcx, [rsp+90h]
000000B7  FF1500000000             call qword ptr [__imp_RegisterClassExA]
000000BD  6685C0                   test ax, ax
000000C0  7507                     jnz L_C9
000000C2  31C0                     xor eax, eax
000000C4  E9C8000000               jmp L_191


[sinsi]

Excellent TimoVJL, cheers

Fun fact, you can use the returned atom in CreateWindowEx

lpClassName If a class atom created by a previous call to RegisterClass or RegisterClassEx, it must be converted using the macro MAKEINTATOM. (The atom must be in the low-order word of lpClassName; the high-order word must be zero.)

[jj2007]

Fun fact, you can use the returned atom in CreateWindowEx

Oh no....! Once more we need to rewrite our templates ;-)

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  invoke CreateWindowEx, WS_EX_ACCEPTFILES, rv(RegisterClassEx, addr wc), chr$("Hello World"),
     WS_OVERLAPPEDWINDOW or WS_VISIBLE,
     600, 150, 750, 400, ; window position: x, y, width, height
     NULL, NULL, wc.hInstance, NULL

[NoCforMe]

In VB you could have code like this

Code Select Expand

  If FunctionThatReturnsAnInteger(arg) then
    DoSomethingWhenTrue
  Else
    DoAnotherThingWhenFalse
  End IfThe missing code is implied If FunctionThatReturnsAnInteger(arg) <> 0

False = 0
True = non-zero

But we also have to take into account the size of what we're testing. For example, RegisterClassEx returns an ATOM (16-bit unsigned) but how many of use this code to check for success?

Code Select Expand

  test eax,eax ;should be test ax,ax ?
  jz failedHow does C/C++ test for failure with this function?

Butbutbut ... even if we do get an ATOM returned (unsigned WORD), it's still going to be non-zero if successful (test eax, eax will evaluate to non-zero), so what's the problem?
After all, AX is half of EAX.

[jj2007]

Theoretically, RegisterClassEx could return BAAD0000h...

[daydreamer]

About atoms in Windows
Atom=atom+atom ; fusion
Atom=atom/2 ; fission 

[sinsi]

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CS_BYTEALIGNCLIENT
0x1000
Aligns the window's client area on a byte boundary (in the x direction).
This style affects the width of the window and its horizontal placement on the display.

CS_BYTEALIGNWINDOW
0x2000
Aligns the window on a byte boundary (in the x direction).
This style affects the width of the window and its horizontal placement on the display.
I see those class flags still used today 

[sinsi]

pprntly fr n nglsh spkr ths s stll rdbl, vn wth n vwls.
Hw d thr lnggs fr? Ds  lngg tht ss ccnt mrks wth thr vwls fr s wll?

Apparently for an english speaker this is still readable, even with no vowels.
How do other languages fare? Does a language that uses accent marks with their vowels fare as well?

[daydreamer]

pprntly fr n nglsh spkr ths s stll rdbl, vn wth n vwls.
Hw d thr lnggs fr? Ds  lngg tht ss ccnt mrks wth thr vwls fr s wll?

Apparently for an english speaker this is still readable, even with no vowels.
How do other languages fare? Does a language that uses accent marks with their vowels fare as well?

Do you mean arabic? Different accent mark above changes what kind of vowels
Japanese hiragana /katakana and swedish extra characters 27, 28,29? Which have in common usage of two dots and a ring over (swedish) or upper right corner(hiragana /katakana) a character
In swedish changes vowels A and O sounds
Swedes are used to read them without accent marks,because all kinds of TV broadcasting sport and music from outside sweden, display showing info are mostly capable of a-z characters
Hiragana /katakana instead can change k's to g's in for example "Anata segoi"

It's fascinating that many complete different languages from Europe, Middle East and Asia, they came up with similar language script system