diff --git a/sane/s2t_api.h b/sane/s2t_api.h
index fac22e1..921ef6d 100644
--- a/sane/s2t_api.h
+++ b/sane/s2t_api.h
@@ -132,7 +132,7 @@ struct __declspec(novtable) IRef
 	COM_API_DECLARE(long, add_ref(void));
 	COM_API_DECLARE(long, release(void));
 };
-struct __declspec(novtable) IScanImg : public IRef
+struct __declspec(novtable) IScanImg : public IRef // 为兼容TWAIN传输方式，位图全部转换为完整的位图文件内容，TWAIN协议层在获取数据时，根据不同传输方式跳过对应的文件头即可 - 2023-07-03
 {
 	COM_API_DECLARE(int, width(void));
 	COM_API_DECLARE(int, line_bytes(void));
@@ -149,6 +149,7 @@ struct __declspec(novtable) IScanImg : public IRef
 	COM_API_DECLARE(void, keep_file(bool keep));
 	COM_API_DECLARE(void, copy_header(SANE_Parameters* head));
 	COM_API_DECLARE(int, image_status(void));
+	COM_API_DECLARE(size_t, get_bits_offset(void));
 };
 struct __declspec(novtable) ISaneInvoker : public IRef
 {
diff --git a/sane/scanned_img.cpp b/sane/scanned_img.cpp
index b8a4a83..24a4cdc 100644
--- a/sane/scanned_img.cpp
+++ b/sane/scanned_img.cpp
@@ -505,7 +505,7 @@ std::string scanned_img::file_header(SANE_ImageType type, float resolution, twai
 {
 	std::string	h("");
 
-	if (type == SANE_IMAGE_TYPE_BMP && xfer != TWAIN_XFER_Memory)
+	if (type == SANE_IMAGE_TYPE_BMP /*&& xfer != TWAIN_XFER_Memory*/)
 	{
 		BITMAPINFOHEADER	bih = { 0 };
 		int					pal_size = 0;
@@ -524,7 +524,7 @@ std::string scanned_img::file_header(SANE_ImageType type, float resolution, twai
 		else if (bih.biBitCount == 8)
 			pal_size = 256 * sizeof(int);
 
-		if (xfer == TWAIN_XFER_File)
+		/*if (xfer == TWAIN_XFER_File)*/
 		{
 			BITMAPFILEHEADER	fh = { 0 };
 			fh.bfType = MAKEWORD('B', 'M');
@@ -535,6 +535,7 @@ std::string scanned_img::file_header(SANE_ImageType type, float resolution, twai
 		}
 
 		h += std::string((char*)&bih, sizeof(bih));
+		pal_size_ = pal_size;
 		if (bih.biBitCount == 1)
 		{
 			int	pal[] = { 0, 0x0ffffff };
@@ -740,6 +741,13 @@ COM_API_IMPLEMENT(scanned_img, int, image_status(void))
 {
 	return status_;
 }
+COM_API_IMPLEMENT(scanned_img, size_t, get_bits_offset(void))
+{
+	if (fmt_.img_format == SANE_IMAGE_TYPE_BMP)
+		return sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + pal_size_;
+	else
+		return 0;
+}
 
 
 
diff --git a/sane/scanned_img.h b/sane/scanned_img.h
index 4beb9bd..c8d8ca0 100644
--- a/sane/scanned_img.h
+++ b/sane/scanned_img.h
@@ -61,6 +61,7 @@ class scanned_img : public IScanImg, virtual public refer
 	std::wstring	file_;
 	unsigned int	header_size_;
 	SANE_FinalImgFormat	fmt_;
+	size_t				pal_size_;
 
 	SANE_Image_Statu	status_;
 
@@ -101,6 +102,7 @@ public:
 	COM_API_OVERRIDE(void, keep_file(bool keep));
 	COM_API_OVERRIDE(void, copy_header(SANE_Parameters* head));
 	COM_API_OVERRIDE(int, image_status(void));
+	COM_API_OVERRIDE(size_t, get_bits_offset(void));
 };
 
 template<class T>
diff --git a/twain/twain/huagaods.cpp b/twain/twain/huagaods.cpp
index 4c04764..3506316 100644
--- a/twain/twain/huagaods.cpp
+++ b/twain/twain/huagaods.cpp
@@ -1141,6 +1141,7 @@ Result huagao_ds::userInterfaceEnable(const Identity&, UserInterface& ui)
 	notfify_close_ = false;
 	bUiOnly_ = false;
 	show_setting_ = false;
+	scanner_->twain_set_transfer((twain_xfer)m_capXferMech);
 	if (!ui.showUi())
 	{
 		scanner_->ui_show_progress((HWND)ui.parent().raw(), m_bIndicator);
@@ -1148,7 +1149,6 @@ Result huagao_ds::userInterfaceEnable(const Identity&, UserInterface& ui)
 		//	return seqError();
 
 		xfer_ready_failed_ = false;
-		scanner_->twain_set_transfer((twain_xfer)m_capXferMech);
 		scanner_status_ = SCANNER_STATUS_SCAN_1;
 		app_trigger_event_ = false;
 		int err = scanner_->start();
@@ -1343,7 +1343,7 @@ Result huagao_ds::imageMemXferGet(const Identity& origin, ImageMemXfer& data)
 	}
 
 	IScanImg		*img = pending_xfer_.img ? pending_xfer_.img : scanner_->take_first_image(TWAIN_XFER_Memory);
-	unsigned long long off = pending_xfer_.img ? pending_xfer_.off : 0;
+	unsigned long long off = pending_xfer_.img ? pending_xfer_.off : img->get_bits_offset();
 	unsigned char	*dst = (unsigned char*)data.memory().data().data();
 	UInt32			buf_l = data.memory().size();
 	unsigned int	line_l = img->line_bytes(),
@@ -1431,8 +1431,8 @@ Result huagao_ds::imageNativeXferGet(const Identity& id, ImageNativeXfer& data)
 		data.release();
 	data = ImageNativeXfer(img->bytes());
 
-	unsigned long long off = 0;
-	unsigned int		total = img->bytes();
+	unsigned long long off = sizeof(BITMAPFILEHEADER);
+	unsigned int		total = img->bytes() - off;
 	unsigned char*		src = img->data(off, &total),
 						* dst = data.data<unsigned char>().data();
 	while (off < img->bytes() && src)
@@ -1713,6 +1713,7 @@ Result huagao_ds::customDataSet(const Twpp::Identity& origin, Twpp::CustomData&
 
 	char* buf = data.lock<char>();
 	scanner_->twain_set_config(buf, data.size());
+	load_sane_util::to_log(1, L"huagao_ds::customDataSet = %d\r\n", strlen(buf));
 
 	return success();
 }