By the use of this tutorial
(http://www.easysoft.com/developer/languages/c/odbc_tutorial.html), I thought it would be very straightforward to use etc.c.odbc.sqlext and etc.c.odbc.sql to create a simple odbc application. But as soon as I started, I noticed a quirk:
SQLRETURN ret;
SQLHDBC dbc;
ret = SQLDriverConnect(dbc, null, "DNS=*mydns*;", SQL_NTS,
null, 0, null, SQL_DRIVER_COMPLETE);
This gives me an error: function
etc.c.odbc.sqlext.SQLDriverConnect (void* hdbc, void* hwnd, char*
szConnStrIn, short cbConnStrIn, char* szConnStrOut, short
cbConnStrOutMax, short* pcbConnStrOut, ushort fDriverCompletion)
is not callable using argument types (void*, typeof(null),
string, int, typeof(null), int, typeof(null), int)
After some casting, I found out it's all related to the string
literal. I thought it would work straight off the box, after
reading the "Interfacing to C" spec
(http://dlang.org/spec/interfaceToC.html).
When I remove the string literal and replace it with null, it
compiles. .ptr and .toStringz both give immutable char*
references, and don't work. A "cast(char *)"DNS=*maydns*;""
works, but it feels a lot like a hack that will not work in the
long run.
