Adobe AIR的本机扩展TWAIN图像扫描仪 [英] Adobe AIR Native Extension TWAIN Image Scanner
问题描述
目前我工作的Adobe AIR本机扩展，它提供了可能性，以简单的使用TWAIN处理图像扫描仪。
我使用 CTwain 班发现 < A HREF =HTTP：//www.$c$cproject.com/Articles/296/AC-Wrapper-for-TWAIN相对=nofollow> HTTP：//www.$c$cproject.com/Articles/ 296 / AC-包装换TWAIN
当我使用这个类的Windows应用程序文件（.exe），它按预期工作，但在DLL（我需要创建ANE文件），它的崩溃时TWAIN设备的用户界面是收盘价（扫描完成时，或通过点击取消按钮）
我的事情，问题是某处DllMain.cpp文件（可能是消息循环），因为在应用程序启动功能的 APIENTRY _tWinMain 它完美的作品。
code
DllMain.cpp
的#includestdafx.h中
＃包括TwainCpp.h
＃包括RESOURCE.H
使用名字空间std;
HWND g_hwnd = NULL;
HINSTANCE g_hInstance = NULL;
BOOL的isValid = FALSE;
BOOL isCreated = FALSE;
CTwain *吐温= NULL;
LRESULT CALLBACK的WndProc（HWND的HWND，未签名的消息，WPARAM wParam参数，LPARAM lParam的）
{
开关（消息）
{
案例WM_CREATE：
打破;
案例WM_DESTROY：
PostQuitMessage（0）;
打破;
}
返回给DefWindowProc（HWND，消息的wParam，lParam的）;
}
BOOL CreateAppWindow（）
{
WNDCLASS厕所;
wc.style = 0;
wc.lpfnWndProc = WndProc的;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = g_hInstance;
wc.hIcon = LoadIcon（NULL，IDI_APPLICATION）;
wc.hCursor =使用LoadCursor（NULL，IDC_ARROW）;
wc.hbrBackground =（HBRUSH）（COLOR_APPWORKSPACE + 1）;
wc.lpszMenuName =FRETwainMenu;
wc.lpszClassName =FRETwainClass;
如果（的RegisterClass（安培; WC））
{
HWND的HWND;
焦炭标题[50];
wsprintf（标题，FRETwain：％X，g_hInstance）;
的hWnd = CreateWindow的（FRETwainClass称号，WS_DISABLED，CW_USEDEFAULT，CW_USEDEFAULT，CW_USEDEFAULT，CW_USEDEFAULT，HWND_MESSAGE，NULL，g_hInstance，NULL）;
如果（HWND）
{
g_hwnd =的hWnd;
返回TRUE;
}
返回FALSE;
}
返回FALSE;
}
DWORD WINAPI CreateAppThread（）
{
如果（CreateAppWindow（））
{
味精味精;
isCreated = TRUE;
而（的GetMessage（安培;味精，NULL，0，0）大于0）
{
如果（TWAIN！= NULL）{
兼容TWAIN＆GT; ProcessMessage的（MSG）;
}
的TranslateMessage（安培;味精）;
在DispatchMessage（＆安培;味精）;
}
返回TRUE;
}
返回FALSE;
}
BOOL WINAPI的DllMain（HINSTANCE的hInstance，DWORD原因，LPVOID lpvReserved）
{
开关（原因）
{
案例DLL_PROCESS_ATTACH：
g_hInstance =实例句柄;
手柄螺纹=的CreateThread（NULL，0，（LPTHREAD_START_ROUTINE）CreateAppThread，（LPVOID）NULL，0，NULL）;
打破;
}
返回TRUE;
}
FRETwain.cpp（背景文件）
的#include＆LT; WINDOWS.H＆GT;
＃包括FRETwain.h
为extern BOOL的isValid;
为extern BOOL isCreated;
为extern HWND g_hwnd;
为extern CTwain *吐温;
为externC
{
FREObject AcquireTwain（FREContext CTX，无效* funcData，uint32_t的ARGC，FREObject的argv []）
{
FREObject结果;
uint32_t的RET = 0;
如果（参考isValid）{
兼容TWAIN＆GT;获取（TWCPP_ANYCOUNT）;
RET = 1;
}
FRENewObjectFromBool（RET，和放大器;结果）;
返回结果;
}
FREObject setDefaultDevice（FREContext CTX，无效* funcData，uint32_t的ARGC，FREObject的argv []）
{
FREObject结果;
uint32_t的RET = 0;
如果（参考isValid）{
兼容TWAIN＆GT; SelectSource（）;
RET = 1;
}
FRENewObjectFromBool（RET，和放大器;结果）;
返回结果;
}
FREObject initTwain（FREContext CTX，无效* funcData，uint32_t的ARGC，FREObject的argv []）
{
FREObject结果;
uint32_t的isTwain = 0;
如果（！的isValid）{
船儿=新CTwain（g_hwnd，CTX）;
的isValid =兼容TWAIN＆GT; IsValidDriver（）;
}
如果（参考isValid）
isTwain = 1;
FRENewObjectFromBool（isTwain，和放大器;结果）;
返回结果;
}
}
我发现了另一个吐温wraper - C ++版本的 EzTwain - 完美的作品
<一href="http://read.pudn.com/downloads81/source$c$c/graph/texture_mapping/312714/ice/win32/Eztwain.h__.htm"相对=nofollow>头文件，<一个href="http://read.pudn.com/downloads81/source$c$c/graph/texture_mapping/312714/ice/win32/Eztwain.h__.htm"相对=nofollow>源文件
所谓的同一个线程内消息循环
无效EZTAPI TWAIN_ModalEventLoop（无效）
{
味精味精;
而（（NSTATE＆GT; = 5）及＆安培;！hDib＆安培;＆安培;的GetMessage（（LPMSG）及味精，NULL，0，0））{
如果（TWAIN_MessageHook（（LPMSG）及！MSG））{
的TranslateMessage（（LPMSG）及味精）;
在DispatchMessage（（LPMSG）及味精）;
}
} // 而
} // TWAIN_ModalEventLoop
不管怎样，谢谢
Currently I am working on Adobe AIR Native extension which gives possibilities to simple manipulate image scanner using TWAIN.
I use CTwain class found at http://www.codeproject.com/Articles/296/A-C-Wrapper-for-TWAIN
When i use this class in Windows Application (.exe) it works as expected, but in dll (which i need to create ane file) it crashes when Twain Device UI is closing (when scan complete or by clicking Cancel button)
I thing the problem is somewhere in DllMain.cpp file (possibly message loop), because in application with starting function APIENTRY _tWinMain it works perfect.
Code
DllMain.cpp
#include "stdafx.h"
#include "TwainCpp.h"
#include "resource.h"
using namespace std;
HWND g_hwnd = NULL;
HINSTANCE g_hInstance = NULL;
BOOL isValid = false;
BOOL isCreated = false;
CTwain *twain = NULL;
LRESULT CALLBACK WndProc(HWND hWnd, unsigned message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_CREATE:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
BOOL CreateAppWindow()
{
WNDCLASS wc;
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = g_hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_APPWORKSPACE + 1);
wc.lpszMenuName = "FRETwainMenu";
wc.lpszClassName = "FRETwainClass";
if(RegisterClass(&wc))
{
HWND hWnd;
char title[50];
wsprintf(title, "FRETwain:%x", g_hInstance);
hWnd = CreateWindow("FRETwainClass", title, WS_DISABLED, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, HWND_MESSAGE, NULL, g_hInstance, NULL);
if(hWnd)
{
g_hwnd = hWnd;
return TRUE;
}
return FALSE;
}
return FALSE;
}
DWORD WINAPI CreateAppThread()
{
if(CreateAppWindow())
{
MSG msg;
isCreated = true;
while(GetMessage(&msg, NULL, 0, 0) > 0)
{
if(twain != NULL){
twain->ProcessMessage(msg);
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return TRUE;
}
return FALSE;
}
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD reason, LPVOID lpvReserved)
{
switch(reason)
{
case DLL_PROCESS_ATTACH:
g_hInstance = hInstance;
HANDLE thread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)CreateAppThread, (LPVOID)NULL, 0, NULL);
break;
}
return TRUE;
}
FRETwain.cpp (context file)
#include <windows.h>
#include "FRETwain.h"
extern BOOL isValid;
extern BOOL isCreated;
extern HWND g_hwnd;
extern CTwain *twain;
extern "C"
{
FREObject AcquireTwain(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[])
{
FREObject result;
uint32_t ret = 0;
if(isValid){
twain->Acquire(TWCPP_ANYCOUNT);
ret = 1;
}
FRENewObjectFromBool(ret, &result);
return result;
}
FREObject setDefaultDevice(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[])
{
FREObject result;
uint32_t ret = 0;
if(isValid){
twain->SelectSource();
ret = 1;
}
FRENewObjectFromBool(ret, &result);
return result;
}
FREObject initTwain(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[])
{
FREObject result;
uint32_t isTwain = 0;
if(!isValid){
twain = new CTwain(g_hwnd, ctx);
isValid = twain->IsValidDriver();
}
if(isValid)
isTwain = 1;
FRENewObjectFromBool(isTwain, &result);
return result;
}
}
I found another Twain wraper - C++ version of EzTwain - works perfect
header file, source file
message loop called within same thread
void EZTAPI TWAIN_ModalEventLoop(void)
{
MSG msg;
while ((nState >= 5) && !hDib && GetMessage((LPMSG)&msg, NULL, 0, 0)) {
if (!TWAIN_MessageHook ((LPMSG)&msg)) {
TranslateMessage ((LPMSG)&msg);
DispatchMessage ((LPMSG)&msg);
}
} // while
} // TWAIN_ModalEventLoop
Thanks anyway
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