diff --git a/hgdriver/hgdev/hg_ipc.cpp b/hgdriver/hgdev/hg_ipc.cpp
index 4402069..15d4685 100644
--- a/hgdriver/hgdev/hg_ipc.cpp
+++ b/hgdriver/hgdev/hg_ipc.cpp
@@ -359,6 +359,8 @@ int shared_memory::write(const char* data, size_t len)
 	memcpy(buf + off, data, len);
 	len_ = len;
 	release_buf(buf);
+
+	return 0;
 }
 
 
diff --git a/hgdriver/hgdev/hg_scanner_239.cpp b/hgdriver/hgdev/hg_scanner_239.cpp
index 3c23ac7..4e650c5 100644
--- a/hgdriver/hgdev/hg_scanner_239.cpp
+++ b/hgdriver/hgdev/hg_scanner_239.cpp
@@ -1762,7 +1762,7 @@ int hg_scanner_239::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_DEVICE_NO_PAPER;
 			if (paperon)
 			{
-				*paperon = true;
+				*paperon = false;
 			}
 		}
 		else
@@ -1770,7 +1770,7 @@ int hg_scanner_239::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_OK;
 			if (paperon)
 			{
-				*paperon = false;
+				*paperon = true;
 			}
 		}	
 	}
diff --git a/hgdriver/hgdev/hg_scanner_302.cpp b/hgdriver/hgdev/hg_scanner_302.cpp
index 58b4d0b..bf45999 100644
--- a/hgdriver/hgdev/hg_scanner_302.cpp
+++ b/hgdriver/hgdev/hg_scanner_302.cpp
@@ -1870,7 +1870,7 @@ int hg_scanner_302::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_DEVICE_NO_PAPER;
 			if (paperon)
 			{
-				*paperon = true;
+				*paperon = false;
 			}
 		}
 		else
@@ -1878,7 +1878,7 @@ int hg_scanner_302::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_OK;
 			if (paperon)
 			{
-				*paperon = false;
+				*paperon = true;
 			}
 		}	
 	}
diff --git a/hgdriver/hgdev/hg_scanner_402.cpp b/hgdriver/hgdev/hg_scanner_402.cpp
index 4c5acca..30351f5 100644
--- a/hgdriver/hgdev/hg_scanner_402.cpp
+++ b/hgdriver/hgdev/hg_scanner_402.cpp
@@ -1737,7 +1737,7 @@ int hg_scanner_402::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_DEVICE_NO_PAPER;
 			if (paperon)
 			{
-				*paperon = true;
+				*paperon = false;
 			}
 		}
 		else
@@ -1745,7 +1745,7 @@ int hg_scanner_402::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_OK;
 			if (paperon)
 			{
-				*paperon = false;
+				*paperon = true;
 			}
 		}	
 	}
diff --git a/hgdriver/hgdev/hg_scanner_439.cpp b/hgdriver/hgdev/hg_scanner_439.cpp
index 69aa51f..eae898d 100644
--- a/hgdriver/hgdev/hg_scanner_439.cpp
+++ b/hgdriver/hgdev/hg_scanner_439.cpp
@@ -1677,7 +1677,7 @@ int hg_scanner_439::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_DEVICE_NO_PAPER;
 			if (paperon)
 			{
-				*paperon = true;
+				*paperon = false;
 			}
 		}
 		else
@@ -1685,7 +1685,7 @@ int hg_scanner_439::get_scanner_paperon(SANE_Bool* paperon)
 			ret = SCANNER_ERR_OK;
 			if (paperon)
 			{
-				*paperon = false;
+				*paperon = true;
 			}
 		}	
 	}