1
2
3 #include <windows.h>
4 #include <assert.h>
5 #include "ttwain_win.h"
6 #include "ttwain_winPD.h"
7 #include "ttwain_state.h"
8 #include "ttwain_error.h"
9
10 #define HINSTLIB0 0
11 static HWND Dummy = 0; /* proxy window */
12
13 extern int TTWAIN_MessageHook(void *lpmsg);
14
CreateDummyWindow(void)15 static HWND CreateDummyWindow(void) {
16 HWND hwnd;
17 hwnd = CreateWindow("STATIC", // class
18 "Acquire Dummy", // title
19 WS_POPUPWINDOW, // style
20 CW_USEDEFAULT, CW_USEDEFAULT, // x, y
21 CW_USEDEFAULT, CW_USEDEFAULT, // width, height
22 HWND_DESKTOP, // parent window
23 NULL, // hmenu
24 HINSTLIB0, // hinst
25 NULL); // lpvparam
26 return hwnd;
27 }
28 /*---------------------------------------------------------------------------*/
TTWAIN_GetValidHwndPD(void * _hwnd)29 void *TTWAIN_GetValidHwndPD(void *_hwnd)
30 // Returns a valid window handle as follows:
31 // If hwnd is a valid window handle, hwnd is returned.
32 // Otherwise a proxy window handle is created and returned.
33 // Once created, a proxy window handle is destroyed when
34 // the source manager is unloaded.
35 // If hwnd is an invalid window handle (other than NULL)
36 // an error box is displayed.
37 {
38 HWND hwnd = (HWND)_hwnd;
39 if (!IsWindow(hwnd)) {
40 if (hwnd != NULL) {
41 assert(!"Window handle is invalid");
42 hwnd = NULL;
43 }
44 if (!Dummy) {
45 Dummy = CreateDummyWindow();
46 if (!IsWindow(Dummy)) {
47 assert(!"Unable to create Dummy window");
48 Dummy = NULL;
49 }
50 }
51 hwnd = Dummy;
52 }
53 return (void *)hwnd;
54 }
55 /*---------------------------------------------------------------------------*/
TTWAIN_EmptyMessageQueuePD(void)56 void TTWAIN_EmptyMessageQueuePD(void) {
57 MSG msg;
58 #ifdef _DEBUG
59 OutputDebugString("EmptyMsgQ<");
60 #endif
61 while (PeekMessage((LPMSG)&msg, NULL, 0, 0, PM_REMOVE)) {
62 if (!TTWAIN_MessageHook((LPMSG)&msg)) {
63 TranslateMessage((LPMSG)&msg);
64 DispatchMessage((LPMSG)&msg);
65 #ifdef _DEBUG
66 OutputDebugString("-");
67 #endif
68 } else {
69 #ifdef _DEBUG
70 OutputDebugString("T");
71 #endif
72 }
73 }
74 #ifdef _DEBUG
75 OutputDebugString(">\n");
76 #endif
77 }
78
TTWAIN_ModalEventLoopPD(void)79 void TTWAIN_ModalEventLoopPD(void) {
80 MSG msg;
81 // Clear global breakout flag
82 TTwainData.breakModalLoop = FALSE;
83
84 while ((TTWAIN_GetState() >= TWAIN_SOURCE_ENABLED) &&
85 !TTwainData.breakModalLoop && GetMessage((LPMSG)&msg, NULL, 0, 0)) {
86 if (!TTWAIN_MessageHook((LPMSG)&msg)) {
87 TranslateMessage((LPMSG)&msg);
88 DispatchMessage((LPMSG)&msg);
89 }
90 } // while
91 TTwainData.breakModalLoop = FALSE;
92 }
TTWAIN_EnableWindowPD(void * hwnd,int flag)93 int TTWAIN_EnableWindowPD(void *hwnd, int flag) {
94 return EnableWindow(hwnd, flag);
95 }
96