Question

Note:

• Pass BSTR variable to COM method, HRESULT return is 8000FFFF
• Previous calls with interface pointer, was successful: HRESULT is 0
• Execution, inside Visual Studio succeeds, outside fails – release and debug

Illustration:

const char *simFile; simFile = new char; //omitted _bstr_t simFileToOpen(simFile); BSTR raw_sim_Open = simFileToOpen.copy(); SysFreeString(simFileToOpen); delete simFile;  hresult = pis8->raw_Open (raw_sim_Open); //0x8000FFFF returned 

Answer 1

simFile looks to be a single character stored inside a const char*.

It is not a NULL terminated string, unless it is an empty string and it’s contents are 0. Are you sure you didn’t mean to do something like:

const char *simFile = new char[1024]; strcpy(simFile, 'path'); 

Even better yet you can just use SysAllocString to get a BSTR directly.

BSTR str = SysAllocString(_T('path'));