WIX cannot find app.exe in x86/x64 output directory - wix

Question

I have a C# application which its build targets are x86 or x64. The build output is (for example) ProjectDir/bin/x86|x64/Debug|Release/*
In my *.wxs file I have defined thr following variable
<?define AppTargetPath = "$(var.MyApp.TargetPath)" ?>
Which points to ProjectDir/bin/Debug|Release/app.exe
If I build the installer, it fails because it does not find my app exe
<File Id="AppExe" Source="$(var.AppTargetPath)" KeyPath="yes"/>
If I look on Using Project References and Variables site (http://wixtoolset.org/documentation/manual/v3/votive/votive_project_references.html) I cannot find another variable.

Answer 1

Maybe try this:
Comment out your existing define.
Add the project building the EXE and your WiX project to the same solution.
Add a reference from the WiX project to the EXE / Binary project.
Try this markup (replace project name "TestConsoleApplication" with yours):
<Fragment>
<ComponentGroup Id="ProductComponents" Directory="INSTALLFOLDER">
<Component>
<File Source="$(var.TestConsoleApplication.TargetPath)" />
</Component>
</ComponentGroup>
</Fragment>
Rebuild All.
Toggle Release and Debug builds, then Rebuild All again.
Links:
Summary: My WiX Quick Start Tips.
Basic WiX Project: Step-by-step, Hello WiX project.
Real-World Sample: Real-World Example: WiX/MSI Application Installer

Answer 2

Actually I solved it by putting together the entire path on top of my wxs file:
<?define AppTargetFileName = "$(var.myApp.TargetFileName)" ?>
<?if $(var.Platform) = x64 ?>
<?define AppTargetPath = "$(var.myApp.ProjectDir)\bin\x64\$(var.myApp.Configuration)\$(var.AppTargetFileName)" ?>
<?elseif $(var.Platform) = x86 ?>
<?define AppTargetPath = "$(var.myApp.ProjectDir)\bin\x86\$(var.myApp.Configuration)\$(var.AppTargetFileName)" ?>
<?else ?>
<?define AppTargetPath = "$(var.myApp.TargetPath)" ?>
<?endif ?>