22. October 2017

SDL2_image for iOS with JPEG image format

Adding SDL2_image with JPEG support for iOS is a little bit different than for Android. In case of Android, it was necessary to add JPEG library in C and build it. iOS has JPEG dependency hidden in another library which is already compiled in frameworks.

If you just add SDL2_image to your project for iOS, you will very likely end up with following linker error:

"_kUTTypeJPEG", referenced from ...
Linker command failed with exit code 1

To resolve this issue, it is sufficient to add two dependencies into your project.

Go to Project and select Build Phases.

In the section Linking add library: ImageIO.framework

Then add the second dependency: MobileCoreServices.framework

Then Clean and Build the project.

These steps should resolve the linker issue, and JPEG should work.

7. September 2017

Gradle Experimental Plugin Android error: Cannot invoke method dependencies()

After initial setup of SDL2 application for Android, I decided to add one activity before launching SDL. So I created the new MainActivity which should launch SDLActivity after a tap on the button.

This time Gradle Experimental Plugin gave me a very fancy error: Cannot invoke method dependencies() on null object.

As always the error message does not provide too many hints how to solve the issue.

Android Studio automatically just appended a dependency into the Gradle file during creation of new MainActivity. So the code in build.gradle looked like this:

tasks.whenTaskAdded { task ->
    if (task.name.contains('compile')) {
        task.dependsOn ':main:distributeLib'
}dependencies {
    compile 'com.android.support.constraint:constraint-layout:+'

Little bit weird code for dependencies. The solution was just to add a new line.

tasks.whenTaskAdded { task ->
    if (task.name.contains('compile')) {
        task.dependsOn ':main:distributeLib'

dependencies {
    compile 'com.android.support.constraint:constraint-layout:+'

The whole project is available at github.com/georgik/sdl2-android-example project.

More articles about SDL2 for Android are available under tag sdl2.

16. July 2017

Android Studio: Failure INSTALL_FAILED_TEST_ONLY

Starting application from Android Studio may fail with the mysterious message: Installation failed with message INSTALL_FAILED_TEST_ONLY.

The IDE will prompt you whether you want to uninstall the existing application.

Even this uninstallation may fail. When you open Run console, you can see something like this:

$ adb shell pm uninstall rocks.georgik.sdlapp
$ adb shell pm install -r "/data/local/tmp/rocks.georgik.sdlapp"
	pkg: /data/local/tmp/rocks.georgik.sdlapp

$ adb shell pm uninstall rocks.georgik.sdlapp
Error while Installing APK

There is a relatively simple fix to this issue. Click drop-down menu with your configuration and choose Edit Configurations…

Select tab General and add -t to Install Flags field. Click Ok.

Now start the application again and it should work.

9. December 2015

Thunderbird and Outlook solution of problem with Courier IMAP sslv3 alert illegal parameter

E-mail clients like Thunderbird or Outlook stopped to communicate with Courier IMAP/SMTP/POP TLS after some upgrade.

The only clue in log file was this error message:

courier couriertls: accept: error:14094417:SSL routines:ssl3_read_bytes:sslv3 alert illegal parameter

The problem was that certificate for IMAP (/etc/courier/imapd.pem) and /etc/courier/dhparam.pem were containing too short key. The short key was sufficient in past for encrypted communication. Unfortunately maintainers of Debian package forgot to add fix for upgrade.

It is very simple to fix the issue. Just generate DH with sufficient length.

DH_BITS=2048 mkdhparams

This command will update /etc/courier/dhparm.pem.

Make sure to update all pem files in case that they contain DH record.

Restart services and clients should be able to reconnect without problem.

If you still experience some issues with PEM files check out article PEM routines:PEM_read_bio:no start line.

31. December 2012

KVM error: internal error no HVM domain loader – solution

It’s very pleasant situation when you reboot Linux server and it starts.

It’s very unpleasant situation when this server contains many KVM virtual servers and none of them start. 🙁

virsh list displays just this:

Id Name State
 0 Domain-0 running

That’s nonsense. There was no such virtual with name Domain-0.

When you try to create domain you can see this fancy error message:

[root@server qemu]# virsh create ./virtual-01.xml
error: Failed to create domain from ./virtual-01.xml
error: internal error no HVM domain loader

What went wrong? How to fix it?

I spare you long story with server diagnostic.

The problem was that server started different kernel after reboot. In this case it was different kernel with Xen support. Centos kernel with Xen support does not have KVM support. That’s quite logical. It was sufficient to change default kernel in grub.conf to non-Xen version, restart machine and everything was working like a charm.