What is A-share trading interface_(Stock trading c interface) development principle

A-share trading interface refers to the electronic interface or software system used to conduct stock trading transactions with domestic stock exchanges (Shanghai Stock Exchange and Shenzhen Stock Exchange). The A-share trading interface is one of the necessary operating skills for financial institutions, brokerages and individual investors. It provides real-time stock quotes, trading orders, cancellations, querying account information and other interface functions, which is convenient for investors to trade stocks operate.

The development of A-share trading interface mainly includes the following aspects:

1. Market View: Provide real-time stock market data, market order data, time-sharing charts, K-line charts and other relevant information to help investors keep abreast of the stock market situation.

For example, in terms of API functions:

	name	Function
basic function	Init	API initialization
	Deinit	API deinitialization
	Logon	Login to trading account
	logoff	Log out of trading account
	QueryData	Query various transaction data
	QueryHistoryData	Query various historical data
	SendOrder	Order
	CancelOrder	Order Cancellation
	GetQuote	Get five quotes
	Repay	Margin and securities lending account direct repayment
	GetExpireDate	Query API authorization expiration date
Single Account Batch Function	QueryDatas	Single-account batch query of various transaction data
	SendOrders	Single account batch order
	CancelOrders	Single account batch cancellation
	GetQuotes	Get five quotes in batches for a single account
Multi-account batch function	QueryMultiAccountsDatas	Multi-account batch query of various transaction data
	SendMultiAccountsOrders	Batch orders for multiple accounts
	CancelMultiAccountsOrders	Multi-account batch cancellation
	GetMultiAccountsQuotes	Get five quotes in batches for multiple accounts

2. Trading orders: Through the trading interface, investors can place trading orders to buy or sell specified stocks, and set relevant trading parameters, such as price and quantity.

3. Fund management: Investors can query their own account fund balance, available purchase amount, position status, etc. through the interface, which facilitates fund management and decision-making.

4. Transaction query: Investors can query their own transaction status through the interface, including transaction price, transaction quantity and other information, to facilitate the management of transaction records.

For example:

sign	void CancelOrders(int ClientId, const char* ExchangeId[], const char* EntrustId[], int Count, char* Result[], char* ErrorInfo[]);
Function	Batch cancellation of single account, distinguish each cancellation by subscript
parameter	ClientId	Client ID
	ExchangeId[]	Exchange Id array
	EntrustId[]	Array of order IDs to be canceled
	Count	The number of cancellation items, that is, the length of the array
	Result[]	Cancellation result array, each result needs to allocate 1024*1024 bytes of space Please refer to [Result format] for the format
	ErrorInfo[]	Error message array, each error message needs to allocate 256 bytes of space
return value	None, whether the cancellation of item i is successful or not is judged by whether ErrorInfo[i] is an empty string

sign	void CancelMultiAccountsOrders(int ClientId[], const char* ExchangeId[], const char* EntrustId[], int Count, char* Result[], char* ErrorInfo[]);
Function	Multi-account batch cancellation, distinguish each cancellation by subscript
parameter	ClientId[]	ClientId array
	ExchangeId[]	Exchange Id array
	EntrustId[]	Array of order IDs to be canceled
	Count	The number of cancellation items, that is, the length of the array
	Result[]	Cancellation result array, each result needs to allocate 1024*1024 bytes of space Please refer to [Result format] for the format
	ErrorInfo[]	Error message array, each error message needs to allocate 256 bytes of space
return value	None, whether the cancellation of item i is successful or not is judged by whether ErrorInfo[i] is an empty string

sign	void GetQuote(int ClientId, const char* Zqdm, char* Result, char* ErrorInfo);
Function	Get five quotes
parameter	ClientId	Client ID
	Zqdm	Securities code
	Result	Query results, need to allocate 1024*1024 bytes of space Please refer to [Result format] for the format
	ErrorInfo	Error message, need to allocate 256 bytes of space
return value	None, the success of the call is judged by whether ErrorInfo is an empty string

5. Cancellation function: If an investor needs to cancel an unfilled order that has been placed, he can cancel the order through the trading interface. Generally, investors need to complete the configuration and installation of the interface according to the relevant information provided by the securities company after opening the securities account, so that they can normally use the trading interface for stock transactions.

因此，股票交易接口的开发是基于接口系统的性能来制定的，适应a股市场的灵活配置，以及运行，增加市场的活跃性。