static t_BlockInfo* GetBlockInfo(byte *block) {
t_BlockInfo *p_blockinfo;
byte *p_begin;
byte *p_end;
ASSERT(NULL != block);
for (p_blockinfo = g_head; NULL != p_blockinfo; p_blockinfo = p_blockinfo->m_next) {
p_begin = BLOCK_BEGIN(p_blockinfo->m_begin);
p_end = BLOCK_END(p_blockinfo->m_begin, p_blockinfo->m_size);
if (p_begin > block || p_end < block)
continue;
else
break;
}
ASSERT(NULL != p_blockinfo);
return p_blockinfo;
}
JNIEXPORT jobject JNICALL
Java_net_javajeff_jtwain_JTwain_acquire
(JNIEnv *env,
jclass clazz)
{
// Create a static window whose handle is passed to DSM_Entry() when we
// open the data source manager.
HWND hwnd = CreateWindow ("STATIC",
"",
WS_POPUPWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
HWND_DESKTOP,
0,
g_hinstDLL,
0);
// If window could not be created, throw exception. Because the exception
// is not actually thrown until execution returns to Java, we must return
// a value -- (jobject) 0 was chosen to represent Image null. This value
// will not be seen in the Java code because of the exception.
if (hwnd == 0)
{
throwJTE (env, "Unable to create private window (acquire)");
return (jobject) 0;
}
// Ensure that the default data source's dialog box does not disappear
// behind other windows, which can be very disconcerting to the user. We do
// that by making the hwnd -- created above and passed to DSM_Entry() below
// -- the handle of the topmost window.
SetWindowPos (hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE);
TW_UINT16 rc;
jobject image = 0;
BLOCK_BEGIN(1)
// Open the data source manager.
rc = (*g_pDSM_Entry) (&g_AppID,
0,
DG_CONTROL,
DAT_PARENT,
MSG_OPENDSM,
(TW_MEMREF) &hwnd);
// If data source manager could not be opened, throw exception. Because the
// exception is not actually thrown until execution returns to Java, we
// first exit current block to destroy previously-created window and return
// a value (which isn't seen in the Java code).
if (rc != TWRC_SUCCESS)
{
throwJTE (env, "Unable to open data source manager (acquire)");
EXIT_CURRENT_BLOCK
}