CreateCursor函数将HINSTANCE作为第一个参数，如下所述： https://msdn.microsoft.com/en-us/library/windows/desktop/ms648385(v=vs.85).aspx
它可以是NULL，但为什么首先需要它？我的猜测是，它可用于查找应用程序主窗口并确定用于创建光标的显示驱动程序。但也许有人有更好的解释？
答案 0 :(得分：0)
在我的Windows Server 2008 R2系统上，根本不使用句柄。这是反汇编，添加了一些评论：
0:000> u createcursor
USER32!CreateCursor:
00000000`77a40cb4 488bc4 mov rax,rsp
00000000`77a40cb7 48895808 mov qword ptr [rax+8],rbx
00000000`77a40cbb 48896810 mov qword ptr [rax+10h],rbp
00000000`77a40cbf 48897018 mov qword ptr [rax+18h],rsi
00000000`77a40cc3 48897820 mov qword ptr [rax+20h],rdi
00000000`77a40cc7 4154 push r12
00000000`77a40cc9 4881ecc0000000 sub rsp,0C0h
00000000`77a40cd0 33db xor ebx,ebx
0:000> u
USER32!CreateCursor+0x1e:
00000000`77a40cd2 458be1 mov r12d,r9d
00000000`77a40cd5 418bf8 mov edi,r8d
00000000`77a40cd8 3bd3 cmp edx,ebx
00000000`77a40cda 8bf2 mov esi,edx
; If xHotSpot is negative, return error
00000000`77a40cdc 0f8c60070100 jl USER32!CreateCursor+0xb0 (00000000`77a51442)
00000000`77a40ce2 413bd1 cmp edx,r9d
; If xHotSpot is greater than nWidth return error
00000000`77a40ce5 0f8f57070100 jg USER32!CreateCursor+0xb0 (00000000`77a51442)
00000000`77a40ceb 443bc3 cmp r8d,ebx
0:000> u
USER32!CreateCursor+0x36:
; If yHotSpot is negative, return error
00000000`77a40cee 0f8c4e070100 jl USER32!CreateCursor+0xb0 (00000000`77a51442)
00000000`77a40cf4 8bac24f0000000 mov ebp,dword ptr [rsp+0F0h]
00000000`77a40cfb 443bc5 cmp r8d,ebp
; If yHotSpot is greater than nHeight return error
00000000`77a40cfe 0f8f3e070100 jg USER32!CreateCursor+0xb0 (00000000`77a51442)
; This LEA overwrites whatever was passed in as the application handle!!!
; RCX was not saved before this point, so handle is lost
00000000`77a40d04 488d4c2430 lea rcx,[rsp+30h]
00000000`77a40d09 33d2 xor edx,edx
00000000`77a40d0b 41b888000000 mov r8d,88h
00000000`77a40d11 e8828affff call USER32!memset (00000000`77a39798)