C Runtime Error R6034

[bhanks]

We are writing a MSI installer using a setup project in Visual Studio 2005.
All dll's are built with VC 8 so each dll uses a Manifest embedded in a
resource. The installer does the following.

1) install VC8 runtime on the target machine,

2) moves and registers the dlls for the application

3) Run a custom action c# script on the commit event. The script loads a dll
via pinvoke and ivokes a function. The function itself instantiates a com
object from another dll using CoCreateInstance. CoCreateInstance fails and
MSIExec.exe gets the c runtime error R6034

Any ideas. More information can be provided as needed."

[alexcohn]

Does the CoCreateInstance work if you call it not from the installer?

--
alexcohn
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[bhanks]

Yes, CoCreateIntance works correctly outside of the installation process.
The runtime error appears when a dll is loaded from another process that was
started up on the Commit event during installation.

"alexcohn" wrote:

>
Does the CoCreateInstance work if you call it not from the installer?

--
alexcohn
------------------------------------------------------------------------
Posted via http://www.codecomments.com
------------------------------------------------------------------------

[bhanks]

The problem was solved by msdn support. We are using Tcl in our installation
and it turns out that Tcl changes the SystemRoot envrionment variable to have
a forward slash in the path. We removed the manipulatioin of the environment
variables as we do not use them from Tcl and that solved the problem.

"bhanks" wrote:

We are writing a MSI installer using a setup project in Visual Studio 2005.
All dll's are built with VC 8 so each dll uses a Manifest embedded in a
resource. The installer does the following.

1) install VC8 runtime on the target machine,

2) moves and registers the dlls for the application

3) Run a custom action c# script on the commit event. The script loads a dll
via pinvoke and ivokes a function. The function itself instantiates a com
object from another dll using CoCreateInstance. CoCreateInstance fails and
MSIExec.exe gets the c runtime error R6034

Any ideas. More information can be provided as needed."