win平台下增加DllMain入口函数并添加模块路径全局变量

hgdriver/hgdev/hg_scanner.cpp

@@ -922,6 +922,8 @@ int hg_scanner::setting_help(void* data)
 	printf("helpfile = %s\r\n",helpfile.c_str());
 
 #ifdef WIN32
+	com = "";
+	helpfile.insert(0, g_module_path);
 	FILE* src = fopen(helpfile.c_str(), "rb");
 	if (src)
 		fclose(src);

hgdriver/hgdev/hg_scanner.h

@@ -22,6 +22,7 @@
 #include "PaperSize.h"
 
 #ifdef WIN32
+extern std::string g_module_path;  // Ending with '\\'
 #else
 #include <unistd.h>
 #endif
@@ -373,6 +374,6 @@ public:
     #else
     static const std::string helpfile_ ="/opt/apps/scanner-driver-huagao/doc/HuaGoScan_scanSettings_Help_manual.pdf";//帮助文档路径
     #endif
-#else
-    static const std::string helpfile_ ="";
+#elif defined(WIN32)
+    static const std::string helpfile_ = "docs\\help_setting.pdf";
 #endif

hgdriver/wrapper/huagaoxxx_warraper_ex.cpp

@@ -99,3 +99,28 @@ extern "C"
 		return hg_scanner_mgr::instance()->hg_scanner_control(h, code, data, len);
 	}
 }
+
+
+#ifdef WIN32
+std::string g_module_path = "";
+
+BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
+{
+	if (reason == DLL_PROCESS_ATTACH)
+	{
+		if (g_module_path.empty())
+		{
+			char	path[MAX_PATH] = { 0 };
+
+			GetModuleFileNameA(inst, path, _countof(path) - 1);
+			if (strrchr(path, '\\'))
+			{
+				strrchr(path, '\\')[1] = 0;
+				g_module_path = path;
+			}
+		}
+	}
+
+	return TRUE;
+}
+#endif

hgsane/sane_hg_mdw.cpp

@@ -2696,3 +2696,26 @@ extern "C" {	// avoid compiler exporting name in C++ style !!!
 }
 
 
+#ifdef WIN32
+std::string g_module_path = "";
+
+BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
+{
+	if (reason == DLL_PROCESS_ATTACH)
+	{
+		if (g_module_path.empty())
+		{
+			char	path[MAX_PATH] = { 0 };
+
+			GetModuleFileNameA(inst, path, _countof(path) - 1);
+			if (strrchr(path, '\\'))
+			{
+				strrchr(path, '\\')[1] = 0;
+				g_module_path = path;
+			}
+		}
+	}
+
+	return TRUE;
+}
+#endif

hgsane/sane_option.h

@@ -9,6 +9,7 @@
 #include <stdio.h>
 #ifdef WIN32
 #define bzero(b, s)		memset(b, 0, s)
+extern std::string g_module_path;	// Ending with '\\'
 #else
 #include <iconv.h>
 #endif