Bug 55821 - DllImport not compatible with CLR
Summary: DllImport not compatible with CLR
Status: NEW
Alias: None
Product: Runtime
Classification: Mono
Component: Interop (show other bugs)
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2017-04-29 22:50 UTC by Marius Ungureanu
Modified: 2017-04-29 23:01 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
NEW

Description Marius Ungureanu 2017-04-29 22:50:26 UTC
Given an extern definition for printf:

static extern int printf(string format, int num);

on Windows, the following DllImport's are valid

[DllImport("msvcrt.dll")]
[DllImport("msvcrt.dll    ")]
[DllImport("msvcrt.dll                        ")]


This is not valid though:

[DllImport(" msvcrt.dll")]

On Mono, this fails with dll not found. Probably, Windows does a TrimEnd on the library name.
Comment 1 Marius Ungureanu 2017-04-29 23:01:46 UTC
var attr = typeof(MainClass).GetMethod("printf", BindingFlags.Static | BindingFlags.NonPublic).GetCustomAttribute<DllImportAttribute>();

attr.Value includes the whitespace.

So the fix is in the library loading code.

This is the only member that supports trailing whitespace removal.