MapPoint Automation with C/C++ - Part 1

This is the first of three articles by Sergey Kostrov on automating MapPoint Automation with C/C++ starting with a simple C/C++ application.

Read the full article here --
http://www.mp2kmag.com/a122--c-c++.a....mappoint.html

To post a comment or question click "Post Reply"

Thanks for the code sample. Why Microsoft does not do a C++ or MFC example baffles me. !

It would be great to get a code sample that allows true integration in my porgram. i.e. a map display within my UI.

Hans W

Hans W wrote some time ago:

"...It would be great to get a code sample that allows true integration in my porgram. i.e. a map display within my UI..."

You can integrate MapPoint functionality in two different ways and it's not difficult:

- with ActiveX MapPoint control ( it can be used with VB, pure C++, MFC etc );
- or, if your application is using only MFC, and you want to use MapPoint automation, try to use CHtmlEditView class.

Best regards,
Sergey

Thanks for the article.
It is on track for what I wanted to do.

But the problem I am having is that I can't get the code sample to run correctly. All works fine until the program exits (after the ConUninitialize()). At this time I get a trap in _Release() accessing m_pInterface. m_pInterface has a non-NULL value but appears to be invalid.

I believe it may be due to not having a myMapPtr->Release(), as well as other object releases.
I have tied this, but I have not found the right combination (if indeed this is the problem).

Any insights as to what is happening or how to diagnose this problem?

My response is related with COM exception ( 0xC0000005 ) at the end of execution MapPoint test application described in article ( Part 1 )...

Unhandled exception 0xC0000005 "Access Violation" happens because:

- all your COM objects were released after g_pMapPoint->Quit() was executed;

- but, pointers to COM objects you worked with are still NOT NULL.

You can fix it in a very simple way:

...
myMapPtr->Saved = true;

try
{
if( g_pMapPoint != NULL )
{
g_pMapPoint->Quit();
}
}
catch( ... ){}

resultsPtr = NULL;
locAddressPtr = NULL;
pinAddressPtr = NULL;
myMapPtr = NULL;
g_pMapPoint = NULL;

CoUninitialize();
}

I tested it and everything is fine now.

Best regards,
Sergey

Don't forget to add this statement: using namespace MapPoint...

So, it should look like:

#include "ComInterfaces.h"

using namespace MapPoint; // <<--

MapPoint::_ApplicationPtr g_pMapPoint = NULL;

void main(void)
{
CoInitialize(NULL);
...
}

Best regards,
Sergey

I receive this error while compiling the demo:

error C2664: 'FindAddressResults' : cannot convert parameter 6 from 'enum MapPoint::GeoCountry' to 'const class _variant_t &'
Reason: cannot convert from 'enum MapPoint::GeoCountry' to 'const class _variant_t'
No constructor could take the source type, or constructor overload resolution was ambiguous

I have european version so i load MPEU82.tlb instead of MPNA82.tlb, but i think this is not important.

Where can i find help about the methods i can call with mapPoint? I mean, how can i know how to use the FindAddressResults method or anyone else? Is there any documentation about using this API?

Thanks a lot

I want to make an application that gets a list of nearby places in text mode (given a long/lat position) and also gets an image map of that point. I know it must be very simple but i'm new on this and i don't know where to begin..

Thanks again!

I solved the problem mentioned above

'FindAddressResults' : cannot convert parameter 6 from 'enum MapPoint::GeoCountry' to 'const class _variant_t &'

by removing the geoCountryDefault argument in the example code leaving the code like this:

FindResultsPtr resultsPtr = myMapPtr->FindAddressResults
(
“400 Coronado Dr”, “Denton”, "", “TX”, “76209”
);

So now it compiles, but when i hit the "Build MapPointApp.exe" option in Microsoft Visual c++ 6, it gives me lots of errors

Code:

Linking...
MapPointApp.obj : error LNK2001: unresolved external symbol "public: long __thiscall MapPoint::_Application::Quit(void)" (?Quit@_Application@MapPoint@@QAEJXZ)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: void __thiscall MapPoint::_Map::PutSaved(short)" (?PutSaved@_Map@MapPoint@@QAEXF@Z)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: long __thiscall MapPoint::Pushpin::Delete(void)" (?Delete@Pushpin@MapPoint@@QAEJXZ)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: long __thiscall MapPoint::_Map::SaveAs(class _bstr_t,enum MapPoint::GeoSaveFormat,short)" (?SaveAs@_Map@MapPoint@@QAEJV_bstr_t@@W4GeoSaveFormat@2@F@Z)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: long __thiscall MapPoint::_Map::ZoomIn(void)" (?ZoomIn@_Map@MapPoint@@QAEJXZ)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: long __thiscall MapPoint::Location::GoTo(void)" (?GoTo@Location@MapPoint@@QAEJXZ)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: void __thiscall MapPoint::Pushpin::PutHighlight(short)" (?PutHighlight@Pushpin@MapPoint@@QAEXF@Z)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: void __thiscall MapPoint::Pushpin::PutBalloonState(enum MapPoint::GeoBalloonState)" (?PutBalloonState@Pushpin@MapPoint@@QAEXW4GeoBalloonState@2@@Z)
MapPointApp.obj : error LNK2001: unresolved external symbol "public: void __thiscall MapPoint::Pushpin::PutSymbol(short)" (?PutSymbol@Pushpin@MapPoint@@QAEXF@Z)
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; class _com_ptr_t<class _com_IIID<struct MapPoint&#58;&#58;Pushpin,&struct __s_GUID _GUID_34b0f619_37e1_4c76_a6da_69bf75a5d3de> > __thiscall MapPoint&#58;&#58;_Map&#58;&#58;AddPushpin&#40;struct MapPoint&#58;&#58;Loca
tion *,class _bstr_t&#41;" &#40;?AddPushpin@_Map@MapPoint@@QAE?AV?$_com_ptr_t@V?$_com_IIID@UPushpin@MapPoint@@$1?_GUID_34b0f619_37e1_4c76_a6da_69bf75a5d3de@@3U__s_GUID@@A@@@@PAULocation@2@V_bstr_t@@@Z&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; class _com_ptr_t<class _com_IIID<struct IDispatch,&struct __s_GUID _GUID_00020400_0000_0000_c000_000000000046> > __thiscall MapPoint&#58;&#58;FindResults&#58;&#58;GetItem&#40;struct tagVARIANT *&#41;" &#40;?G
etItem@FindResults@MapPoint@@QAE?AV?$_com_ptr_t@V?$_com_IIID@UIDispatch@@$1?_GUID_00020400_0000_0000_c000_000000000046@@3U__s_GUID@@A@@@@PAUtagVARIANT@@@Z&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; class _com_ptr_t<class _com_IIID<struct MapPoint&#58;&#58;FindResults,&struct __s_GUID _GUID_188084cf_db96_482b_97a6_2571df9bef81> > __thiscall MapPoint&#58;&#58;_Map&#58;&#58;FindAddressResults&#40;class _bs
tr_t,class _bstr_t,class _bstr_t,class _bstr_t,class _bstr_t,class _variant_t const &&#41;" &#40;?FindAddressResults@_Map@MapPoint@@QAE?AV?$_com_ptr_t@V?$_com_IIID@UFindResults@MapPoint@@$1?_GUID_188084cf_db96_482b_97a6_2571df9bef81@@3U__s_GUID@@A@@@@V_bstr
_t@@0000ABV_variant_t@@@Z&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; class _com_ptr_t<class _com_IIID<struct MapPoint&#58;&#58;_Map,&struct __s_GUID _GUID_90b167c0_923d_4b65_aee2_66938491c916> > __thiscall MapPoint&#58;&#58;_Application&#58;&#58;GetActiveMap&#40;void&#41;" &#40;?GetAc
tiveMap@_Application@MapPoint@@QAE?AV?$_com_ptr_t@V?$_com_IIID@U_Map@MapPoint@@$1?_GUID_90b167c0_923d_4b65_aee2_66938491c916@@3U__s_GUID@@A@@@@XZ&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; void __thiscall MapPoint&#58;&#58;_Application&#58;&#58;PutUnits&#40;enum MapPoint&#58;&#58;GeoUnits&#41;" &#40;?PutUnits@_Application@MapPoint@@QAEXW4GeoUnits@2@@Z&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; void __thiscall MapPoint&#58;&#58;_Application&#58;&#58;PutCaption&#40;class _bstr_t&#41;" &#40;?PutCaption@_Application@MapPoint@@QAEXV_bstr_t@@@Z&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; void __thiscall MapPoint&#58;&#58;_Application&#58;&#58;PutWindowState&#40;enum MapPoint&#58;&#58;GeoWindowState&#41;" &#40;?PutWindowState@_Application@MapPoint@@QAEXW4GeoWindowState@2@@Z&#41;
MapPointApp.obj &#58; error LNK2001&#58; unresolved external symbol "public&#58; void __thiscall MapPoint&#58;&#58;_Application&#58;&#58;PutVisible&#40;short&#41;" &#40;?PutVisible@_Application@MapPoint@@QAEXF@Z&#41;
Debug/MapPointApp.exe &#58; fatal error LNK1120&#58; 17 unresolved externals
Error executing link.exe.

MapPointApp.exe - 18 error&#40;s&#41;, 0 warning&#40;s&#41;

Please, can anyone help me? I know if i get this code to work i could do my own but damn Murphy's Law, DAMN IT!!

Hi, Sergey,
I tried to integrate your example to my CDialog derived class, but always get compiling error like this:
...\source\debug\mpna82.tli(16) : error C2653: '_Application' : is not a class or namespace name

Any idea what's going on with my application?
I alsoe tried to insert a MapPointControl OCX object into my class, but it crashed when I tried to call the OpenMap() method.
Appreciate your help.
Frank