Chaning channels with SendMessage

[atanas.bakalov]

Hello guys,

 

Could you please tell me which is the proper way to change a channel using SendMessage?

 

I do the following :

 

struct channelstruct

{

DWORD channelnr;

DWORD channelptr;

};

main()

{

....

channelstruct chnr;

chnr.channelnr = 33;

chnr.channelptr = NULL;

::SendMessage(hwnd1,0xB2C2,0x2204,(LPARAM)&chnr);

...

}

 

and expect the DVBViewer to switch to channel number 33, however it always switches to channel number 0.

I'm using the method proposed by Lars_MQ here

http://www.DVBViewer.info/forum/index.php?...t=0#entry199650

 

Thanks in advance.

[Lars_MQ]

DWORD channelnr;

Should be an integer not dword.

 

Channel[0] means the channelnumber you send is not valid.

[atanas.bakalov]

Hmm.

In C/C++ DWORD is unsigned int which is 4 bytes. I guess the same is for Delhi's Integer.

 

However when I define the struct as follows :

 

struct channelstruct

{

int channelnr;

int channelptr;

};

, the same happens.

 

Probably this is something related to the way C/C++ "packs structs" and Delphi "depacks records". But who knows. Maybe someone who have the source code of DVBViewer

Edited October 2, 2008 by atanas.bakalov

[Lars_MQ]

#pragma pack(1)

struct channelstruct
{
int channelnr;
int channelptr;
};

#pragma pack()

Seems to be the equivalent to packed record...

[atanas.bakalov]

This doesn't help too.

Probably I do something fundamentally wrong here.

I'm wrting my own application (a standalone .exe process) which sends MSG_SETCHANNEL = 0x2204 to the DVBViewer process.

However I suspect the only possible message that could be send between process boundaries is MSG_REMOTE, and MSG_SETCHANNEL is only possible when called from a plugin dll.

 

Is that the reason ?

 

Just the SDK is not very clear about that topic.

[Lars_MQ]

Oh yeah, of course. This only works inprocess. Sorry I assumed you where working on a plugin-dll.

[Isch003]

You can try the following. (quick & dirty)

 

If you want switch to a specific channel no. (e.g. 23).

 

Simply send the following messages to DVBViewer

 

1. PostMessage(hwnd, 0xB2C2, 0x0815, 0x08E) // send the "Channel2" command

2. PostMessage(hwnd, 0xB2C2, 0x0815, 0x08F) // send the "Channel3" command

 

The LPARAM is the channel no. (see actions.ini).

Edited October 2, 2008 by Isch003

[atanas.bakalov]

Thanks guys

 

The "quick and dirty" method of Isch003, saves my a lot of time, because I won't write a plugin.

 

Thanks again