CTPAPI开发之⼆：制作CTPjava版API
⽬前上期技术CTP系统提供的API版本是C++版本
SWIG是⼀个能将C/C++接⼝转换为其他语⾔的⼯具，⽬前可以⽀持Python,Java,R等语⾔。
本⽂主要介绍Windows 32/64位平台下利⽤Swig⼯具将CTP C++接⼝API转换为Java可调⽤的接⼝。
1、从CTP官⽹下载最新API包，包中包含32位和64位。API⽂件包清单：
2、下载安装Swig软件：
3、在API⽂件包中创建thostapi.i 和various.i⽂件，thostapi.i是⼀个接⼝⽂件，⽤于告诉swig为哪些类和⽅法创建接⼝various.i是⽤于将C++接⼝中的数组参数转换为java 的Array的⼯具类
%module(directors="1") thosttraderapi
%include "various.i"
%apply char **STRING_ARRAY { char *ppInstrumentID[] }
%{
#include "ThostFtdcMdApi.h"
#include "ThostFtdcTraderApi.h"
%}
%feature("director") CThostFtdcMdSpi;
%include "ThostFtdcUserApiDataType.h"
%include "ThostFtdcUserApiStruct.h"
%include "ThostFtdcMdApi.h"
%feature("director") CThostFtdcTraderSpi;
%include "ThostFtdcTraderApi.h"
4、⽣成java接⼝：
在当前⽂件夹创建src/ctp⽂件夹⽤于放置⽣成的java⽂件
.
.\..\swigwin-2.0. -c++ -java -package ctp.thosttraderapi -outdir src -o thosttraderapi_wrap.cpp thostapi.i
运⾏完成之后，可在当前⽂件夹中看到⽤于包装原来C++接⼝的⽂件：
5、通过C++得到java可调⽤的动态库
创建⼀个C++⼯程，应⽤程序类型选择DLL，将以下⽂件添加到⼯程中去:
将dk⽬录\Java\jdk1.8.0_111\include下的jni.h和win32⽂件夹下的jni_md.h, jawt_md.h⼀共三个⽂件
拷贝到安装vs的include⽬录底下\Microsoft Visual Studio 12.0\VC\include。
因为thosttraderapi_wrap.cpp⽂件中包含了<jni.h>，是⽤于⽣成Java可调⽤接⼝的库⽂件。
将如下8个函数注释掉，这⼏个函数中涉及到将字符串转换为char类型，有问题：
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1VTC_1BankBankToFuture_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1VTC_1BankFutureToBank_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1VTC_1FutureBankToFuture_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1VTC_1FutureFutureToBank_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1FTC_1BankLaunchBankToBroker_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1FTC_1BrokerLaunchBankToBroker_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1FTC_1BankLaunchBrokerToBank_1get
Java_ctp_thosttraderapi_thosttradeapiJNI_THOST_1FTDC_1FTC_1BrokerLaunchBrokerToBank_1get
之后进⾏编译，⽣成java可调⽤的动态库⽂件thosttraderapi_wrap.dll：
6、创建java项⽬，将三个动态库和之前⽣成的src/ctp包拷贝到项⽬，并加载动态库进来：
到此java API制作完成，可以进⾏java开发了
附various.i:
/*
* char **STRING_ARRAY typemaps.
* These typemaps are for C String arrays which are NULL terminated.
*  char *values[] = { "one", "two", "three", NULL }; // note NULL
* char ** is mapped to a Java String[].
*
* Example usage wrapping:
*  %apply char **STRING_ARRAY { char **input };
*  char ** foo(char **input);
*
* Java usage:
*  String numbers[] = { "one", "two", "three" };
*  String[] ret = modulename.foo( numbers };
*/
%typemap(jni) char **STRING_ARRAY "jobjectArray"
%typemap(jtype) char **STRING_ARRAY "String[]"
%typemap(jstype) char **STRING_ARRAY "String[]"
%typemap(in) char **STRING_ARRAY (jint size) {
int i = 0;
size = JCALL1(GetArrayLength, jenv, $input);
#ifdef __cplusplus
$1 = new char*[size+1];
#else
$1 = (char **)calloc(size+1, sizeof(char *));
#endif
for (i = 0; i<size; i++) {
jstring j_string = (jstring)JCALL2(GetObjectArrayElement, jenv, $input, i);
const char *c_string = JCALL2(GetStringUTFChars, jenv, j_string, 0);
#ifdef __cplusplus
$1[i] = new char [strlen(c_string)+1];
#else
$1[i] = (char *)calloc(strlen(c_string)+1, sizeof(const char *));
#endif
strcpy($1[i], c_string);
JCALL2(ReleaseStringUTFChars, jenv, j_string, c_string);
JCALL1(DeleteLocalRef, jenv, j_string);
}
$1[i] = 0;
}
%typemap(freearg) char **STRING_ARRAY {
int i;
for (i=0; i<size$argnum-1; i++)
#ifdef __cplusplus
delete[] $1[i];
delete[] $1;
#else
free($1[i]);
free($1);
#endif
}
%typemap(out) char **STRING_ARRAY {
int i;
int len=0;
jstring temp_string;
const jclass clazz = JCALL1(FindClass, jenv, "java/lang/String");
while ($1[len]) len++;
jdk最新下载安装步骤jresult = JCALL3(NewObjectArray, jenv, len, clazz, NULL);
/
* exception checking omitted */
for (i=0; i<len; i++) {
temp_string = JCALL1(NewStringUTF, jenv, *result++);
JCALL3(SetObjectArrayElement, jenv, jresult, i, temp_string);
JCALL1(DeleteLocalRef, jenv, temp_string);
}
}
%typemap(javain) char **STRING_ARRAY "$javainput"
%typemap(javaout) char **STRING_ARRAY  {
return $jnicall;
}
/
*
* char **STRING_OUT typemaps.
* These are typemaps for returning strings when using a C char ** parameter type. * The returned string appears in the 1st element of the passed in Java String array. *
* Example usage wrapping:
*  void foo(char **string_out);
*
* Java usage:
*  String stringOutArray[] = { "" };
*  modulename.foo(stringOutArray);
*  System.out.println( stringOutArray[0] );
*/
%typemap(jni) char **STRING_OUT "jobjectArray"
%typemap(jtype) char **STRING_OUT "String[]"
%typemap(jstype) char **STRING_OUT "String[]"
%typemap(javain) char **STRING_OUT "$javainput"
%typemap(in) char **STRING_OUT($*1_ltype temp) {
if (!$input) {
SWIG_JavaThrowException(jenv, SWIG_JavaNullPointerException, "array null");
return $null;
}
if (JCALL1(GetArrayLength, jenv, $input) == 0) {
SWIG_JavaThrowException(jenv, SWIG_JavaIndexOutOfBoundsException, "Array must contain at least 1 element"); return $null;
}
$1 = &temp;
}
%typemap(argout) char **STRING_OUT {
jstring jnewstring = NULL;
if($1) {
jnewstring = JCALL1(NewStringUTF, jenv, *$1);
}
JCALL3(SetObjectArrayElement, jenv, $input, 0, jnewstring);
}
/*
* char *BYTE typemaps.
* These are input typemaps for mapping a Java byte[] array to a C char array.
* Note that as a Java array is used and thus passeed by reference, the C routine
* can return data to Java via the parameter.
*
* Example usage wrapping:
*  void foo(char *array);
*
* Java usage:
*  byte b[] = new byte[20];
*  modulename.foo(b);
*/
%typemap(jni) char *BYTE "jbyteArray"
%typemap(jtype) char *BYTE "byte[]"
%typemap(jstype) char *BYTE "byte[]"
%typemap(in) char *BYTE {
$1 = (char *) JCALL2(GetByteArrayElements, jenv, $input, 0);
}
%typemap(argout) char *BYTE {
JCALL3(ReleaseByteArrayElements, jenv, $input, (jbyte *) $1, 0);
}
%typemap(javain) char *BYTE "$javainput"
/
* Prevent default freearg typemap from being used */
%typemap(freearg) char *BYTE ""

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