Please help to see why this code compiler error？

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MR.Z

Joined: 12 Mar 2025
Posts: 18

MR.Z 17 Mar 2025, 13:09

The fasm program generated by AI in windows10 environment pops up a confirmation box, but why the prompt "push MB_YESNOCANCEL|MB_ICONQUESTION" when compiling is wrong? The full code is as follows:
format PE console
entry main

include 'win32a.inc'

section '.data' data readable writable
msg db 'Do you want to continue?', 0
caption db 'Confirmation', 0

section '.text' code readable executable
main:
; 初始化数据段
mov eax, [esp+4] ; 获取命令行参数的起始地址（我们不需要，但保持堆栈平衡）
and esp, 0FFFFFFF0h ; 16字节对齐堆栈
call __main_startup ; FASM 启动代码，初始化数据段等

; 调用 MessageBoxA 函数
push MB_YESNOCANCEL|MB_ICONQUESTION ; uType
push caption ; lpCaption
push msg ; lpText
push 0 ; hWnd
call [MessageBoxA]

; 检查返回值
test eax, eax
jz exit_no

; 用户点击了“是”或“确定”
push msgbox_yes
call [printf]
add esp, 4

jmp exit

exit_no:
; 用户点击了“否”或“取消”
push msgbox_no
call [printf]
add esp, 4

exit:
; 退出程序
push 0
call [ExitProcess]

section '.idata' import data readable
library user32, 'user32.dll', kernel32, 'kernel32.dll'

import user32, \
MessageBoxA, 'MessageBoxA'

import kernel32, \
ExitProcess, 'ExitProcess', \
__main_startup, '__mainCRTStartup' ; FASM 启动代码和 C 运行时启动代码（可选）

section '.bss' resb 1

msgbox_yes db 'User clicked Yes or OK!', 13, 10, 0
msgbox_no db 'User clicked No or Cancel!', 13, 10, 0

17 Mar 2025, 13:09

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20632
Location: In your JS exploiting you and your system

revolution 17 Mar 2025, 13:22

fasm uses or for numerical bitwise ORing.

fasm uses | for logical ORing.

push expects a numerical value and doesn't accept logical values.

Therefore use:

Code:

push MB_YESNOCANCEL or MB_ICONQUESTION

17 Mar 2025, 13:22

MR.Z

Joined: 12 Mar 2025
Posts: 18

MR.Z 17 Mar 2025, 14:09

revolution wrote:

fasm uses or for numerical bitwise ORing.

fasm uses | for logical ORing.

push expects a numerical value and doesn't accept logical values.

Therefore use:
Code:
push MB_YESNOCANCEL or MB_ICONQUESTION     

You're so amazing! How did you know that?

17 Mar 2025, 14:09

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20632
Location: In your JS exploiting you and your system

revolution 17 Mar 2025, 23:08

MR.Z wrote:

How did you know that?

Because I am not an "AI".

17 Mar 2025, 23:08

MR.Z

Joined: 12 Mar 2025
Posts: 18

MR.Z 18 Mar 2025, 00:39

revolution wrote:

MR.Z wrote:
How did you know that?
Because I am not an "AI".

Wow, relying on AI learning is still relatively easy to mislead.

18 Mar 2025, 00:39

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20632
Location: In your JS exploiting you and your system

revolution 18 Mar 2025, 00:51

"AI" isn't about precision, it is about generalisation.

Programming requires precision.

18 Mar 2025, 00:51

MR.Z

Joined: 12 Mar 2025
Posts: 18

MR.Z 18 Mar 2025, 01:03

revolution wrote:

"AI" isn't about precision, it is about generalisation.

Programming requires precision.

So how do I learn fasm? I don't want to waste your time because of a small problem.

18 Mar 2025, 01:03

Mat-Quasar

Joined: 02 Mar 2025
Posts: 82

Mat-Quasar 18 Mar 2025, 06:35

MR.Z wrote:

So how do I learn fasm?

As suggested by bzt in reply to your thread ( https://board.flatassembler.net/topic.php?p=243066#243066 ), you can read FASM documentation.

If you have downloaded flat assembler for Windows, you can find FASM.pdf in the unzipped folder.

I suggest you read the following section:

Quote:

1.2 Assembly syntax

Chapter 2 Instruction set
2.1 The x86 architecture instructions
2.1.1 Data movement instructions
2.1.2 Type conversion instructions
2.1.3 Binary arithmetic instructions
2.1.4 Decimal arithmetic instructions
2.1.5 Logical instructions
2.1.6 Control transfer instructions
2.1.8 Strings operations
2.1.10 Conditional operations
2.1.11 Miscellaneous instructions

2.4 Formatter directives
2.4.1 MZ executable
2.4.2 Portable Executable
2.4.4 Executable and Linkable Format

Chapter 3 Windows programming

Assembly programming is all about (1) CPU instruction (see Chapter 2), (2) OS library call (see Chapter 3) and (3) Binary file format (see Section 2.4).

You can start with a simple "Hello, world!" program first.

All the best in your learning journey!

18 Mar 2025, 06:35

MR.Z

Joined: 12 Mar 2025
Posts: 18

MR.Z 18 Mar 2025, 08:59

Mat-Quasar wrote:

MR.Z wrote:

So how do I learn fasm?

As suggested by bzt in reply to your thread ( https://board.flatassembler.net/topic.php?p=243066#243066 ), you can read FASM documentation.

If you have downloaded flat assembler for Windows, you can find FASM.pdf in the unzipped folder.

I suggest you read the following section:

Quote:
1.2 Assembly syntax

Chapter 2 Instruction set
2.1 The x86 architecture instructions
2.1.1 Data movement instructions
2.1.2 Type conversion instructions
2.1.3 Binary arithmetic instructions
2.1.4 Decimal arithmetic instructions
2.1.5 Logical instructions
2.1.6 Control transfer instructions
2.1.8 Strings operations
2.1.10 Conditional operations
2.1.11 Miscellaneous instructions

2.4 Formatter directives
2.4.1 MZ executable
2.4.2 Portable Executable
2.4.4 Executable and Linkable Format

Chapter 3 Windows programming

Assembly programming is all about (1) CPU instruction (see Chapter 2), (2) OS library call (see Chapter 3) and (3) Binary file format (see Section 2.4).

You can start with a simple "Hello, world!" program first.

All the best in your learning journey!

Great, finally you don't have to read the entire fasm document all over again, you can look at the required knowledge, thank you for your answers and blessings!

18 Mar 2025, 08:59

Mat-Quasar

Joined: 02 Mar 2025
Posts: 82

Mat-Quasar 18 Mar 2025, 09:09

兄弟，加油！懂得读些英文文档是大有帮助的。

（我不是中国人）

18 Mar 2025, 09:09

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