95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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#include <windows.h>
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#include <assert.h>
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#include "ttwain_win.h"
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#include "ttwain_winPD.h"
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#include "ttwain_state.h"
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#include "ttwain_error.h"
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#define HINSTLIB0 0
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static HWND Dummy = 0; /* proxy window */
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extern int TTWAIN_MessageHook(void *lpmsg);
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static HWND CreateDummyWindow(void) {
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HWND hwnd;
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hwnd = CreateWindow("STATIC", // class
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"Acquire Dummy", // title
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WS_POPUPWINDOW, // style
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CW_USEDEFAULT, CW_USEDEFAULT, // x, y
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CW_USEDEFAULT, CW_USEDEFAULT, // width, height
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HWND_DESKTOP, // parent window
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NULL, // hmenu
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HINSTLIB0, // hinst
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NULL); // lpvparam
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return hwnd;
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}
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/*---------------------------------------------------------------------------*/
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void *TTWAIN_GetValidHwndPD(void *_hwnd)
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// Returns a valid window handle as follows:
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// If hwnd is a valid window handle, hwnd is returned.
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// Otherwise a proxy window handle is created and returned.
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// Once created, a proxy window handle is destroyed when
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// the source manager is unloaded.
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// If hwnd is an invalid window handle (other than NULL)
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// an error box is displayed.
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{
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HWND hwnd = (HWND)_hwnd;
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if (!IsWindow(hwnd)) {
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if (hwnd != NULL) {
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assert(!"Window handle is invalid");
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hwnd = NULL;
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}
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if (!Dummy) {
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Dummy = CreateDummyWindow();
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if (!IsWindow(Dummy)) {
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assert(!"Unable to create Dummy window");
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Dummy = NULL;
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}
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}
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hwnd = Dummy;
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}
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return (void *)hwnd;
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}
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/*---------------------------------------------------------------------------*/
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void TTWAIN_EmptyMessageQueuePD(void) {
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MSG msg;
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#ifdef _DEBUG
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OutputDebugString("EmptyMsgQ<");
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#endif
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while (PeekMessage((LPMSG)&msg, NULL, 0, 0, PM_REMOVE)) {
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if (!TTWAIN_MessageHook((LPMSG)&msg)) {
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TranslateMessage((LPMSG)&msg);
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DispatchMessage((LPMSG)&msg);
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#ifdef _DEBUG
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OutputDebugString("-");
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#endif
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} else {
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#ifdef _DEBUG
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OutputDebugString("T");
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#endif
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}
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}
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#ifdef _DEBUG
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OutputDebugString(">\n");
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#endif
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}
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void TTWAIN_ModalEventLoopPD(void) {
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MSG msg;
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// Clear global breakout flag
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TTwainData.breakModalLoop = FALSE;
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while ((TTWAIN_GetState() >= TWAIN_SOURCE_ENABLED) &&
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!TTwainData.breakModalLoop && GetMessage((LPMSG)&msg, NULL, 0, 0)) {
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if (!TTWAIN_MessageHook((LPMSG)&msg)) {
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TranslateMessage((LPMSG)&msg);
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DispatchMessage((LPMSG)&msg);
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}
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} // while
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TTwainData.breakModalLoop = FALSE;
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}
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int TTWAIN_EnableWindowPD(void *hwnd, int flag) {
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return EnableWindow(hwnd, flag);
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}
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