Failed to start because it could not find or load the Qt platform plugin "windows"

dannox

Hi

http://imgur.com/IOzEcGj inside platforms dir there is the content of platforms in Qt5.3/plugins/platform
http://pastebin.com/sfaLzXjW it's weird...

LoadLibraryW("C:\Qt\Qt5.3.0\5.3\msvc2010_opengl\plugins\platforms\qwindowsd.dll") returned NULL. Error: The specified procedure could not be found (127).

is the red line...but it's over there. :/

Maybe depends on something else, infact if I open it separetely with DW, gives me an error, but there is no clue of what misses (a parte qtcore and qtgui, which should be loaded when the executable is launched)

hskoglund

Hi, what happens if you change to compile your app in Release mode instead of Debug?

EDIT: I forgot, also have you tried to compile a barebones app, i.e. just select a Widgets app and compile it without adding any code.

dannox

In Release the same thing without assert dialog.
And I've compiled several apps, with cmake or directly from QtCreator, and don't raise that error.

Instead from DW log I don't understand this section:

LoadLibraryW("C:\Qt\Qt5.3.0\5.3\msvc2010_opengl\plugins\platforms\qwindowsd.dll") called from "QT5CORED.DLL" at address 0x664F8B15.
Loaded "QWINDOWSD.DLL" at address 0x0F500000. Successfully hooked module.
Loaded "WINMM.DLL" at address 0x74570000. Successfully hooked module.

Unloaded "QWINDOWSD.DLL" at address 0x0F500000.
Unloaded "WINMM.DLL" at address 0x74570000.

LoadLibraryW("C:\Qt\Qt5.3.0\5.3\msvc2010_opengl\plugins\platforms\qwindowsd.dll") returned NULL. Error: The specified procedure could not be found (127).

Why the first time is ok, and then it unloads QWINDOWSD.DLL for trying to load it again unsuccessfully?

JKSH

Questions:

Does your app run in Qt Creator?

What version of OpenGL does your PC support?

A few notes:

You have created a Debug build. You should create a Release build for deployment.
"Procedure not found" means that the DLL was found but an expected function was not found inside the DLL.
** In Qt, this error is often encountered when you copy the wrong version of a DLL. Please confirm: Did you make sure you copied the DLLs from C:\Qt\Qt5.3.0\5.3\msvc2010_opengl instead of C:\Qt\Qt5.3.0\Tools\QtCreator?

Suggestion: Delete your current deployment folder, create a Release build, and follow the Wiki again -- "Initial deployment (Quick and dirty)". In particular, make sure you follow Steps #2.3 and #3 under -- you missed these steps before.

dannox

I run this app on msvc 10, after configuring with CMake 3.0

the version is 4.0

I've already created the Release build just to check if I had the same error
u right for the procedure ! :) I check if I mismatched the version but the path is correct :(

Ok, I'll try again, maybe I forgot something

thank you!

dannox

I did the procedure from scratch, so CMaked from the beginning and copy Qt/bin and plugins in the binary dir of my project , and... now works both in release and in debug.
Well... thank you all, actually I think that the build and deploy dirs got dirty with something not correct but I can't say really which file.
ciao! :)

JKSH

Good to hear :) Happy coding!

bapzangbo

i have do follow the instruction of hskoglund
im just copy platforms in \Qt\5.3\msvc2013_32\plugins\ and paste to folder debug contains application file .exe
my program run normally

thanks hskoglund

Jack Jiang

[quote author="hskoglund" date="1404262881"]Hi, I have a "blog post":http://www.tripleboot.org/?p=138 about this problem.
It's for deploying a bare bones app but maybe it'll help you too.[/quote]

Thank you hskoglund! Your blog helped me to solve this problem.

Jack Jiang

[quote author="hskoglund" date="1404262881"]Hi, I have a "blog post":http://www.tripleboot.org/?p=138 about this problem.
It's for deploying a bare bones app but maybe it'll help you too.[/quote]

Thank you hskoglund! Your blog helped me to solve this problem.