CODEWITHSUNDEEP
windowswinapivisual-studio-2017
Pierre
Pierre

Reputation: 4416

error RC2247: Symbol name too long (winnt.h)

I'm getting an RC2247 error (Symbol name too long) when attempting to display the dialogs in a Win32 app. The error is occurring in this file:

C:\Program Files (x86)\Windows Kits\10\Include\10.0.17134.0\um\winnt.h

This worked fine under VS2015. The error started when I upgraded to VS2017.

I have seen the following posts, they don't appear to be relevant because they pertain to prsht.h:

RC2247 : Cannot open Rc file : Resource explorer cannot load resource ; Load failed

http://social.msdn.microsoft.com/Forums/en-US/vcprerelease/thread/4a648d6a-ea81-44d3-89c2-57fa5caa6fd6

The error disappears if I comment out the entire resource.rc file. The error occurs if the RC contains the single line:

#include <winnt.h>

When I click on "Edit code"", nothing happens.

I am grateful for any suggestions.

Upvotes: 3

Views: 2908

Answers (2)

CalendarMan
CalendarMan

Reputation: 1

I have run into this complaint rc2247 when trying to edit the rc file in a project compiled in vs2010. This had been upgraded from vs2050. I found that if I chose to open the .sin file via 'version selector' instead of going straight to vs2010, then it still opens in vs2010 but there is no problem in editing the rc. I don't pretend to understand ! CalendarMan

Upvotes: 0

RbMm
RbMm

Reputation: 33706

We must not include windows.h or winnt.h to .rc file - this headers - for are for c/c++ compilers and not designed for RC (resource compiler which process .rc file). as result if we include such files we may get errors.

We need include #include <winres.h> to .rc files. this file specially designed for the RC compiler. Internally it included:

#include <winuser.rh>
#include <commctrl.rh>
#include <dde.rh>
#include <winnt.rh>
#include <dlgs.h>
#include <winver.h>

and define some macros.

All standard windows definitions, which we need/use in rc file - exist in winres.h (and it subincludes). From another side in it no extra symbols/definitions wich exist in windows.h - it's not needed for rc and some time can cause errors.

So simply #include <winres.h> at the beginning of resource files and all will be OK.

Upvotes: 6

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