summaryrefslogtreecommitdiffstats
path: root/win/tkWinSendCom.c
blob: 59e2b69aba7acf8e9beb72b338e05341a7912221 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
/*
 * tkWinSendCom.c --
 *
 *	This file provides support functions that implement the Windows "send"
 *	command using COM interfaces, allowing commands to be passed from
 *	interpreter to interpreter. See also tkWinSend.c, where most of the
 *	interesting functions are.
 *
 * We implement a COM class for use in registering Tcl interpreters with the
 * system's Running Object Table. This class implements an IDispatch interface
 * with the following method:
 *	Send(String cmd) As String
 * In other words the Send methods takes a string and evaluates this in the
 * Tcl interpreter. The result is returned as another string.
 *
 * Copyright (C) 2002 Pat Thoyts <patthoyts@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkInt.h"
#include "tkWinSendCom.h"

/*
 * ----------------------------------------------------------------------
 * Non-public prototypes.
 *
 *	These are the interface methods for IUnknown, IDispatch and
 *	ISupportErrorInfo.
 *
 * ----------------------------------------------------------------------
 */

static void		TkWinSendCom_Destroy(LPDISPATCH pdisp);

static STDMETHODIMP	WinSendCom_QueryInterface(IDispatch *This,
			    REFIID riid, void **ppvObject);
static STDMETHODIMP_(ULONG)	WinSendCom_AddRef(IDispatch *This);
static STDMETHODIMP_(ULONG)	WinSendCom_Release(IDispatch *This);
static STDMETHODIMP	WinSendCom_GetTypeInfoCount(IDispatch *This,
			    UINT *pctinfo);
static STDMETHODIMP	WinSendCom_GetTypeInfo(IDispatch *This, UINT iTInfo,
			    LCID lcid, ITypeInfo **ppTI);
static STDMETHODIMP	WinSendCom_GetIDsOfNames(IDispatch *This, REFIID riid,
			    LPOLESTR *rgszNames, UINT cNames, LCID lcid,
			    DISPID *rgDispId);
static STDMETHODIMP	WinSendCom_Invoke(IDispatch *This, DISPID dispidMember,
			    REFIID riid, LCID lcid, WORD wFlags,
			    DISPPARAMS *pDispParams, VARIANT *pvarResult,
			    EXCEPINFO *pExcepInfo, UINT *puArgErr);
static STDMETHODIMP	ISupportErrorInfo_QueryInterface(
			    ISupportErrorInfo *This, REFIID riid,
			    void **ppvObject);
static STDMETHODIMP_(ULONG)	ISupportErrorInfo_AddRef(
				    ISupportErrorInfo *This);
static STDMETHODIMP_(ULONG)	ISupportErrorInfo_Release(
				    ISupportErrorInfo *This);
static STDMETHODIMP	ISupportErrorInfo_InterfaceSupportsErrorInfo(
			    ISupportErrorInfo *This, REFIID riid);
static HRESULT		Send(TkWinSendCom *obj, VARIANT vCmd,
			    VARIANT *pvResult, EXCEPINFO *pExcepInfo,
			    UINT *puArgErr);
static HRESULT		Async(TkWinSendCom *obj, VARIANT Cmd,
			    EXCEPINFO *pExcepInfo, UINT *puArgErr);

/*
 * ----------------------------------------------------------------------
 *
 * CreateInstance --
 *
 *	Create and initialises a new instance of the WinSend COM class and
 *	returns an interface pointer for you to use.
 *
 * ----------------------------------------------------------------------
 */

HRESULT
TkWinSendCom_CreateInstance(
    Tcl_Interp *interp,
    REFIID riid,
    void **ppv)
{
    /*
     * Construct v-tables for each interface.
     */

    static IDispatchVtbl vtbl = {
	WinSendCom_QueryInterface,
	WinSendCom_AddRef,
	WinSendCom_Release,
	WinSendCom_GetTypeInfoCount,
	WinSendCom_GetTypeInfo,
	WinSendCom_GetIDsOfNames,
	WinSendCom_Invoke,
    };
    static ISupportErrorInfoVtbl vtbl2 = {
	ISupportErrorInfo_QueryInterface,
	ISupportErrorInfo_AddRef,
	ISupportErrorInfo_Release,
	ISupportErrorInfo_InterfaceSupportsErrorInfo,
    };
    HRESULT hr = S_OK;
    TkWinSendCom *obj = NULL;

    /*
     * This had probably better always be globally visible memory so we shall
     * use the COM Task allocator.
     */

    obj = (TkWinSendCom *) CoTaskMemAlloc(sizeof(TkWinSendCom));
    if (obj == NULL) {
	*ppv = NULL;
	hr = E_OUTOFMEMORY;
    } else {
	obj->lpVtbl = &vtbl;
	obj->lpVtbl2 = &vtbl2;
	obj->refcount = 0;
	obj->interp = interp;

	/*
	 * lock the interp? Tcl_AddRef/Retain?
	 */

	hr = obj->lpVtbl->QueryInterface((IDispatch*)obj, riid, ppv);
    }

    return hr;
}

/*
 * ----------------------------------------------------------------------
 *
 * TkWinSendCom_Destroy --
 *
 *	This helper function is the destructor for our COM class.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Releases the storage allocated for this object.
 *
 * ----------------------------------------------------------------------
 */
static void
TkWinSendCom_Destroy(
    LPDISPATCH pdisp)
{
    CoTaskMemFree((void*)pdisp);
}

/*
 * ----------------------------------------------------------------------
 *
 * IDispatch --
 *
 *	The IDispatch interface implements the 'late-binding' COM methods
 *	typically used by scripting COM clients. The Invoke method is the most
 *	important one.
 *
 * ----------------------------------------------------------------------
 */

static STDMETHODIMP
WinSendCom_QueryInterface(
    IDispatch *This,
    REFIID riid,
    void **ppvObject)
{
    HRESULT hr = E_NOINTERFACE;
    TkWinSendCom *this = (TkWinSendCom*)This;
    *ppvObject = NULL;

    if (memcmp(riid, &IID_IUnknown, sizeof(IID)) == 0
	    || memcmp(riid, &IID_IDispatch, sizeof(IID)) == 0) {
	*ppvObject = (void**)this;
	this->lpVtbl->AddRef(This);
	hr = S_OK;
    } else if (memcmp(riid, &IID_ISupportErrorInfo, sizeof(IID)) == 0) {
	*ppvObject = (void**)(this + 1);
	this->lpVtbl2->AddRef((ISupportErrorInfo*)(this + 1));
	hr = S_OK;
    }
    return hr;
}

static STDMETHODIMP_(ULONG)
WinSendCom_AddRef(
    IDispatch *This)
{
    TkWinSendCom *this = (TkWinSendCom*)This;

    return InterlockedIncrement(&this->refcount);
}

static STDMETHODIMP_(ULONG)
WinSendCom_Release(
    IDispatch *This)
{
    long r = 0;
    TkWinSendCom *this = (TkWinSendCom*)This;

    if ((r = InterlockedDecrement(&this->refcount)) == 0) {
	TkWinSendCom_Destroy(This);
    }
    return r;
}

static STDMETHODIMP
WinSendCom_GetTypeInfoCount(
    IDispatch *This,
    UINT *pctinfo)
{
    HRESULT hr = E_POINTER;

    if (pctinfo != NULL) {
	*pctinfo = 0;
	hr = S_OK;
    }
    return hr;
}

static STDMETHODIMP
WinSendCom_GetTypeInfo(
    IDispatch *This,
    UINT iTInfo,
    LCID lcid,
    ITypeInfo **ppTI)
{
    HRESULT hr = E_POINTER;

    if (ppTI) {
	*ppTI = NULL;
	hr = E_NOTIMPL;
    }
    return hr;
}

static STDMETHODIMP
WinSendCom_GetIDsOfNames(
    IDispatch *This,
    REFIID riid,
    LPOLESTR *rgszNames,
    UINT cNames,
    LCID lcid,
    DISPID *rgDispId)
{
    HRESULT hr = E_POINTER;

    if (rgDispId) {
	hr = DISP_E_UNKNOWNNAME;
	if (_wcsicmp(*rgszNames, L"Send") == 0) {
	    *rgDispId = TKWINSENDCOM_DISPID_SEND, hr = S_OK;
	} else if (_wcsicmp(*rgszNames, L"Async") == 0) {
	    *rgDispId = TKWINSENDCOM_DISPID_ASYNC, hr = S_OK;
	}
    }
    return hr;
}

static STDMETHODIMP
WinSendCom_Invoke(
    IDispatch *This,
    DISPID dispidMember,
    REFIID riid,
    LCID lcid,
    WORD wFlags,
    DISPPARAMS *pDispParams,
    VARIANT *pvarResult,
    EXCEPINFO *pExcepInfo,
    UINT *puArgErr)
{
    HRESULT hr = DISP_E_MEMBERNOTFOUND;
    TkWinSendCom *this = (TkWinSendCom*)This;

    switch (dispidMember) {
    case TKWINSENDCOM_DISPID_SEND:
	if (wFlags | DISPATCH_METHOD) {
	    if (pDispParams->cArgs != 1) {
		hr = DISP_E_BADPARAMCOUNT;
	    } else {
		hr = Send(this, pDispParams->rgvarg[0], pvarResult,
			pExcepInfo, puArgErr);
	    }
	}
	break;

    case TKWINSENDCOM_DISPID_ASYNC:
	if (wFlags | DISPATCH_METHOD) {
	    if (pDispParams->cArgs != 1) {
		hr = DISP_E_BADPARAMCOUNT;
	    } else {
		hr = Async(this, pDispParams->rgvarg[0], pExcepInfo, puArgErr);
	    }
	}
	break;
    }
    return hr;
}

/*
 * ----------------------------------------------------------------------
 *
 * ISupportErrorInfo --
 *
 *	This interface provides rich error information to COM clients. Used by
 *	VB and scripting COM clients.
 *
 * ----------------------------------------------------------------------
 */

static STDMETHODIMP
ISupportErrorInfo_QueryInterface(
    ISupportErrorInfo *This,
    REFIID riid,
    void **ppvObject)
{
    TkWinSendCom *this = (TkWinSendCom*)(This - 1);

    return this->lpVtbl->QueryInterface((IDispatch*)this, riid, ppvObject);
}

static STDMETHODIMP_(ULONG)
ISupportErrorInfo_AddRef(
    ISupportErrorInfo *This)
{
    TkWinSendCom *this = (TkWinSendCom*)(This - 1);

    return InterlockedIncrement(&this->refcount);
}

static STDMETHODIMP_(ULONG)
ISupportErrorInfo_Release(
    ISupportErrorInfo *This)
{
    TkWinSendCom *this = (TkWinSendCom*)(This - 1);

    return this->lpVtbl->Release((IDispatch*)this);
}

static STDMETHODIMP
ISupportErrorInfo_InterfaceSupportsErrorInfo(
    ISupportErrorInfo *This,
    REFIID riid)
{
    /*TkWinSendCom *this = (TkWinSendCom*)(This - 1);*/
    return S_OK; /* or S_FALSE */
}

/*
 * ----------------------------------------------------------------------
 *
 * Async --
 *
 *	Queues the command for evaluation in the assigned interpreter.
 *
 * Results:
 *	A standard COM HRESULT is returned. The Tcl result is discarded.
 *
 * Side effects:
 *	The interpreters state and result will be modified.
 *
 * ----------------------------------------------------------------------
 */

static HRESULT
Async(
    TkWinSendCom *obj,
    VARIANT Cmd,
    EXCEPINFO *pExcepInfo,
    UINT *puArgErr)
{
    HRESULT hr = S_OK;
    int result = TCL_OK;
    VARIANT vCmd;

    VariantInit(&vCmd);

    hr = VariantChangeType(&vCmd, &Cmd, 0, VT_BSTR);
    if (FAILED(hr)) {
	Tcl_SetStringObj(Tcl_GetObjResult(obj->interp),
		"invalid args: Async(command)", -1);
	SetExcepInfo(obj->interp, pExcepInfo);
	hr = DISP_E_EXCEPTION;
    }

    if (SUCCEEDED(hr)) {
	if (obj->interp) {
	    Tcl_Obj *scriptPtr = Tcl_NewUnicodeObj(vCmd.bstrVal,
		    (int)SysStringLen(vCmd.bstrVal));
	    result = TkWinSend_QueueCommand(obj->interp, scriptPtr);
	}
    }

    VariantClear(&vCmd);

    return hr;
}

/*
 * ----------------------------------------------------------------------
 *
 * Send --
 *
 *	Evaluates the string in the assigned interpreter. If the result is a
 *	valid address then set it to the result returned by the evaluation.
 *	Tcl exceptions are converted into COM exceptions.
 *
 * Results:
 *	A standard COM HRESULT is returned. The Tcl result is set as the
 *	method calls result.
 *
 * Side effects:
 *	The interpreters state and result will be modified.
 *
 * ----------------------------------------------------------------------
 */

static HRESULT
Send(
    TkWinSendCom *obj,
    VARIANT vCmd,
    VARIANT *pvResult,
    EXCEPINFO *pExcepInfo,
    UINT *puArgErr)
{
    HRESULT hr = S_OK;
    int result = TCL_OK;
    VARIANT v;

    VariantInit(&v);
    hr = VariantChangeType(&v, &vCmd, 0, VT_BSTR);
    if (SUCCEEDED(hr)) {
	if (obj->interp) {
	    Tcl_Obj *scriptPtr = Tcl_NewUnicodeObj(v.bstrVal,
		    (int)SysStringLen(v.bstrVal));

	    result = Tcl_EvalObjEx(obj->interp, scriptPtr,
		    TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL);
	    if (pvResult) {
		VariantInit(pvResult);
		pvResult->vt = VT_BSTR;
		pvResult->bstrVal = SysAllocString(
			Tcl_GetUnicode(Tcl_GetObjResult(obj->interp)));
	    }
	    if (result == TCL_ERROR) {
		hr = DISP_E_EXCEPTION;
		SetExcepInfo(obj->interp, pExcepInfo);
	    }
	}
	VariantClear(&v);
    }
    return hr;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */