// 获得记录
// 本函数每次调用前，最好调用一次 TryInitialize()
// 不确保一定可以获得nCount个
// parameters:
// nStart 获取记录的开始位置(从0开始计数)
public async Task <PresentResult> OncePresent(
string strResultSetName,
int nStart,
int nCount,
string strElementSetName,
string strPreferredRecordSyntax)
{
if (nCount == 0)
{
return new PresentResult {
Value = 0, ErrorInfo = "nCount 参数为 0，本次没有真正请求服务器获取记录"
}
}
;
BerTree tree = new BerTree();
PRESENT_REQUEST struPresent_request = new PRESENT_REQUEST();
//byte[] baPackage = null;
//int nRet;
struPresent_request.m_strReferenceId = this._currentRefID;
struPresent_request.m_strResultSetName = strResultSetName; // "default";
struPresent_request.m_lResultSetStartPoint = nStart + 1;
struPresent_request.m_lNumberOfRecordsRequested = nCount;
struPresent_request.m_strElementSetNames = strElementSetName;
struPresent_request.m_strPreferredRecordSyntax = strPreferredRecordSyntax;
int nRet = tree.PresentRequest(struPresent_request,
out byte[] baPackage);
if (nRet == -1)
{
return new PresentResult {
Value = -1, ErrorInfo = "CBERTree::PresentRequest() fail!"
}
}
;
if (this._channel.Connected == false)
{
this.CloseConnection();
return(new PresentResult {
Value = -1, ErrorInfo = "socket尚未连接或者已经被关闭"
});
}
#if DUMPTOFILE
DeleteFile("presentrequest.bin");
DumpPackage("presentrequest.bin",
(char *)baPackage.GetData(),
baPackage.GetSize());
DeleteFile("presentrequest.txt");
tree.m_RootNode.DumpToFile("presentrequest.txt");
#endif
BerTree tree1 = new BerTree();
{
RecvResult result = await this._channel.SendAndRecv(
baPackage);
if (result.Value == -1)
{
return(new PresentResult(result));
}
#if DUMPTOFILE
DeleteFile("presendresponse.bin");
DumpPackage("presentresponse.bin",
(char *)baPackage.GetData(),
baPackage.GetSize());
#endif
tree1.m_RootNode.BuildPartTree(result.Package,
0,
result.Package.Length,
out int nTotalLen);
}
#if DUMPTOFILE
DeleteFile("PresentResponse.txt");
tree1.m_RootNode.DumpDebugInfoToFile("PresentResponse.txt");
#endif
SEARCH_RESPONSE search_response = new SEARCH_RESPONSE();
nRet = BerTree.GetInfo_PresentResponse(tree1.GetAPDuRoot(),
ref search_response,
out RecordCollection records,
true,
out string strError);
if (nRet == -1)
{
return new PresentResult {
Value = -1, ErrorInfo = strError
}
}
;
SetElementSetName(records, strElementSetName);
if (search_response.m_diagRecords.Count != 0)
{
return new PresentResult {
Value = -1, ErrorInfo = "error diagRecords:\r\n\r\n---\r\n" + search_response.m_diagRecords.GetMessage()
}
}
;
return(new PresentResult {
Records = records
});
}
// 解释包
void menuItem_explainContent_Click(object sender,
EventArgs e)
{
TreeNode node = this.treeView_ber.SelectedNode;
if (node == null)
{
MessageBox.Show(this, "尚未选定节点");
return;
}
BerNode bernode = (BerNode)node.Tag;
if (TreeNodeLevel(node) != 1)
{
MessageBox.Show(this, "必须是Ber包根节点");
return;
}
BerNode root = bernode;
int nRet = 0;
string strError = "";
string strDebugInfo = "OK";
if (root.m_uTag == BerTree.z3950_initRequest)
{
// 观察Initial请求包
nRet = BerTree.GetInfo_InitRequest(
root,
out strDebugInfo,
out strError);
}
else if (root.m_uTag == BerTree.z3950_searchRequest)
{
nRet = BerTree.GetInfo_SearchRequest(
root,
out strDebugInfo,
out strError);
}
else if (root.m_uTag == BerTree.z3950_presentRequest)
{
nRet = BerTree.GetInfo_PresentRequest(
root,
out strDebugInfo,
out strError);
}
else if (root.m_uTag == BerTree.z3950_initResponse)
{
nRet = BerTree.GetInfo_InitResponse(root,
out strDebugInfo,
out strError);
}
else if (root.m_uTag == BerTree.z3950_searchResponse)
{
nRet = BerTree.GetInfo_SearchResponse(root,
out strDebugInfo,
out strError);
}
else if (root.m_uTag == BerTree.z3950_presentResponse)
{
RecordCollection records = null;
SEARCH_RESPONSE search_response = new SEARCH_RESPONSE();
nRet = BerTree.GetInfo_PresentResponse(root,
ref search_response,
out records,
true,
out strError);
}
if (nRet == -1)
{
MessageBox.Show(this, strError);
}
else
{
MessageBox.Show(this, strDebugInfo);
}
}