Mapping function signatures

In "PL/SQL Developer Plug-In interface Documentation" which is shiped with PL/SQL Developer installation and is in <PL/SQL Developer home>\plugindoc directory, all functions signature are given in C++ and Delphi languages using their data types. In order to call PL/SQL Developer callback functions from the plug-in or PL/SQL Developer to call plug-in's exported functions, the correct function signature must be used. In other words, data types must match. Parameter name does not affect signature, thus any name you like can be used.

According to "PL/SQL Developer Plug-In interface Documentation", the number of data types is limited to 3:

...Boolean (32 bit), Integer (32 bit) and zero terminated strings.

This table provides mapping rules between C#, C++ and Delphi data types.

C++	Delphi	C#
char*	PChar	string, when passing as an argument IntPtr, when using as return type
char**	var PChar	out string
int	int	int
void	procedure	void
BOOL	Bool	[MarshalAs(UnmanagedType.Bool)] bool
void*	Pointer	IntPtr

See Passing and returning arguments for more details on passing arguments to and receiving values back from the unmanaged code.

Some examples of matching function signatures.

Tip: different names, maching your naming convention, can be used for functions and parameters names. Not necessarilly those given in the API documentation. Names do not affect signature. Anyway it is recommended that looking at the name of your function you could easily map it to the name in the API documentation. For instance, IDE_RefreshMenus could be IdeRefreshMenus. See Recommended naming for some hints.

IDE_RefreshMenus:

void      IDE_RefreshMenus(int ID);      // C++
procedure IDE_RefreshMenus(ID: Integer); // Delphi
void      IDE_RefreshMenus(int id);      // C#

IDE_SetMenuCheck:

void      IDE_SetMenuCheck(int ID, int Index, BOOL Enabled);                                 //C++
procedure IDE_SetMenuCheck(ID, Index: Integer; Enabled: Bool);                               // Delphi
void      IDE_SetMenuCheck(int id, int index, [MarshalAs(UnmanagedType.Bool)] bool enabled); // C#

IDE_SetConnection (note how return value is marshalled):

BOOL     IDE_SetConnection(char *Username, char *Password, char *Database); // C++
function IDE_SetConnection(Username, Password, Database: PChar): Bool;      // Delphi

[return: MarshalAs(UnmanagedType.Bool)]
bool     IDE_SetConnection(string username, string password, string db);    // C#

IDE_GetConnectionInfo (demonstrates usage of out parameters):

void      IDE_GetConnectionInfo(char **Username, char **Password, char **Database);       // C++
procedure IDE_GetConnectionInfo(var Username, Password, Database: PChar);                 // Delphi
void      IDE_GetConnectionInfo(out string username, out string password, out string db); // C#