winapi - WriteFile字符串字节长度导致崩溃

Question

问题

我一直在尝试各种字节计数，以使WriteFile正常工作。问题是写入文件后立即崩溃。所有文本都在文件中，但是“程序已崩溃，发送给Microsoft？”弹出错误对话框。

当注释掉调用WriteFile及其下面的所有内容时，该程序可以正常运行并且不会崩溃。但是，当我只取消注释WriteFile并在其下面保留所有代码时，将其注释掉，这再次使它变得丑陋。代码在下面，如果有人可以看到我错过的内容，将不胜感激:-)

我尝试过的字节长度。

我尝试了23、24(字符串长度+空值)，25(也许我忘记了一个字节)的字节长度，并且也只是使用SIZEOF WriteText而所有这些都失败了:-(。

代码

.386 
.model flat,stdcall 
option casemap:none ; Case Sensitive

; Windows
include \masm32\include\windows.inc 

; Kernel32
include \masm32\include\kernel32.inc 
includelib \masm32\lib\kernel32.lib 

.data 
FilePath         db "C:\test.txt",0
WriteText        db "This is some test text."

.code 
start: 

; Edit a file

invoke CreateFile, addr FilePath, GENERIC_WRITE, FILE_SHARE_WRITE or FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL
push eax ; save the file handle

; This works other than the crashing, any number less then 23
; and the file has some of the text clipped
; any larger and NUL is appended until the byte count is matched.
invoke WriteFile, eax, addr WriteText, 23, NULL, NULL

pop eax
push eax

invoke CloseHandle, eax

invoke ExitProcess, 0
end start 

Answer 1

根据the documentation for the WriteFile function:

lpNumberOfBytesWritten [out, optional]
[...]
This parameter can be NULL only when the lpOverlapped parameter is not NULL.

lpNumberOfBytesWritten和lpOverlapped都为NULL。将 addr some_writable_variable传递为lpNumberOfBytesWritten，它应该可以工作。