voidtools

IPC C Example

A C example to send a search query to Everything using WM_COPYDATA and retrieve the results.


Sending a query

#define COPYDATA_QUERYCOMPLETE	0

BOOL sendquery(HWND hwnd,DWORD max_results,WCHAR *search_string,BOOL regex,BOOL match_case,BOOL match_whole_word,BOOL match_path)
{
EVERYTHING_IPC_QUERY *query;
DWORD len;
DWORD size;
HWND everything_hwnd;
COPYDATASTRUCT cds;

everything_hwnd = FindWindow(EVERYTHING_IPC_WNDCLASS,0);
if (everything_hwnd)
{
len = (int)wcslen(search_string);

size = sizeof(EVERYTHING_IPC_QUERY) - sizeof(WCHAR) + len*sizeof(WCHAR) + sizeof(WCHAR);

query = (EVERYTHING_IPC_QUERY *)HeapAlloc(GetProcessHeap(),0,size);
if (query)
{
query->max_results = max_results;
query->offset = 0;
query->reply_copydata_message = COPYDATA_QUERYCOMPLETE;
query->search_flags = (regex?EVERYTHING_IPC_REGEX:0) | (match_case?EVERYTHING_IPC_MATCHCASE:0) | (match_whole_word?EVERYTHING_IPC_MATCHWHOLEWORD:0) | (match_path?EVERYTHING_IPC_MATCHPATH:0);
query->reply_hwnd = hwnd;

CopyMemory(query->search_string,search_string,(len+1)*sizeof(WCHAR));

cds.cbData = size;
cds.dwData = EVERYTHING_IPC_COPYDATAQUERY;
cds.lpData = query;

if (SendMessage(everything_hwnd,WM_COPYDATA,(WPARAM)hwnd,(LPARAM)&cds) == TRUE)
{
HeapFree(GetProcessHeap(),0,query);

return TRUE;
}
else
{
// Everything IPC service not running
}

HeapFree(GetProcessHeap(),0,query);
}
}
else
{
// the everything window was not found.
// we can optionally RegisterWindowMessage("EVERYTHING_IPC_CREATED") and
// wait for Everything to post this message to all top level windows when its up and running.
}

return FALSE;
}

Retrieving results


void DisplayPathName(TCHAR *path,TCHAR *filename)
{
// ...
// do something with path and filename
// ...
}

LRESULT CALLBACK window_proc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
DWORD i;
EVERYTHING_IPC_LIST *list

switch(uMsg)
{
case WM_COPYDATA:
{
COPYDATASTRUCT *cds = (COPYDATASTRUCT *)lParam;

switch(cds->dwData)
{
case COPYDATA_QUERYCOMPLETE:

list = (EVERYTHING_IPC_LIST *)cds->lpData;

for(i=0;i<list->numitems;i++)
{
DisplayPathName(EVERYTHING_IPC_ITEMPATH(list,&list->items[i]),EVERYTHING_IPC_ITEMFILENAME(list,&list->items[i]))
}

return TRUE;
}

break;
}
}

return DefWindowProc(hwnd,msg,wParam,lParam);
}

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