Debug code consultation

[GuBuChang]

i am use VS2022 debug current project.
but i find filefakeclient.dll can not be load.
so connectnamedpipe return false.
if i run from local the filefakeclient.dll can be load correctly. and i can debug filefakeclient.dll code by attach to notepad.exe
so how to do debug current project by VS2022

and another question

i just find code

extern HANDLE(*CreateFileA_Original)(LPCSTR, DWORD, DWORD, LPSECURITY_ATTRIBUTES, DWORD, DWORD, HANDLE);
is declare
it do not have implement.

but i find this function call. why? can we call a function without implement?

Thank you very much for your reply。

[Danleb]

@GuBuChang
Regarding #1, I don't have enough info to reproduce it. Please provide more detailed steps to reproduce this issue.

Regarding #2, those are not function declarations. That are variables, pointers to functions. That are just pointers which store addresses of the original I/O functions before that are hooked.

[GuBuChang]

regarding #1 i maybe find why.

use GetFullPathName in debug model can not fetch full path of FileFakerClient.dll correctly.
GetFullPath use dir is VS project dir