Open an Excel document with C++ builder

Question

I am trying to open an existing Excel document using C++ builder. but I am having an exception :

Project project1.exe raised exception class EOlSysError with message "incorrect type of variable"

Here is the code I'm using :

try {
    vMSExcel = Variant::GetActiveObject("Excel.Application");
}
catch (...) {
    vMSExcel = Variant::CreateObject("Excel.Application");
}

vMSExcel.OlePropertySet("Visible", true);

Variant vFileName = "C:\\Users\mi\\Desktop\\classeur1.xls";

vXLWorkbooks = vMSExcel.OlePropertyGet("Workbooks");
vXLWorkbook = vXLWorkbooks.OleFunction("Open", vFileName);

The exception is thrown in this line :

vXLWorkbook = vXLWorkbooks.OleFunction("Open", vFileName);

Any help will be appreciated. Thank you

Answer 1

PROBLEM FIXED :

I changed the type of vFileName from Vaiant to String and added c_str() to OleFucntion as following

vXLWorkbook = vXLWorkbooks.OleFunction( "Open",vFileName.c_str());