使用输入和输出参数在Java中调用C++函数
问题描述:
我有一个C++代码已经被其他人连接到一个可视基本用户界面。这里是连接C++到Visual Basic的功能代码之一:使用输入和输出参数在Java中调用C++函数
extern "C" void PASCAL EXPORT RCS(stAct* act,stResourceDirectory* resDir, stCalendar* calendar, short numOfAct, short numOfRes, short numOfCal, int nDataDate)
{
Network network;
short id;
Activity* p_act;
node<Activity>* p_node;
// Setting
network.create_calendars (calendar, numOfCal);
network.set_data_date (nDataDate);
set_activity(network, act, numOfAct);
// only for id, duration, and description
set_resource(network, act, resDir, numOfAct, numOfRes);
// create resource profile and add required resource for every activity
network.CPM();
p_node = network.get_network_head_p();
while (p_node != NULL) {
p_act = p_node->refer_data();
id = p_act->get_ID();
act[id].TF_in_CPM = p_act->get_TF_min();
act[id].FF_in_CPM = p_act->get_FF();
act[id].EST_in_CPM = p_act->get_EST();
act[id].EFT_in_CPM = p_act->get_EFT();
act[id].LST_in_CPM = p_act->get_LST();
act[id].LFT_in_CPM = p_act->get_LFT();
p_node = p_node->get_link();
}
network.RCS();
p_node = network.get_network_head_p();
while (p_node != NULL) {
p_act = p_node->refer_data();
id = p_act->get_ID();
act[id].TF_in_RCS = p_act->get_TF_min();
act[id].FF_in_RCS = p_act->get_FF();
act[id].EST_in_RCS = p_act->get_EST();
act[id].EFT_in_RCS = p_act->get_EFT();
act[id].LST_in_RCS = p_act->get_LST();
act[id].LFT_in_RCS = p_act->get_LFT();
p_node = p_node->get_link();
}
}
我想更换使用Java GUI的Visual Basic中的一部分,它似乎混淆了我写的连接代码。有没有人可以通过JNA/SWIG/Runtime或其他任何你认为会更容易更好的方法来调用三个C++函数,并传递参数给本地方法并从中接收结果?
答
以下是帮助您入门的指导性示例。在这个片段中,Java2Win64是包含要执行的本机代码的DLL。函数functionMaryam()将1个参数作为int并返回一个int。易于扩展任何数据类型。 公开课JnaExampleMaryam {
// ------------------------------------------
// Java2Win.class
// ------------------------------------------
public interface Java2Win extends Library {
Java2Win call = (Java2Win) Native.loadLibrary("Java2Win64", Java2Win.class);
int functionMaryam(int i);
}
// ------------------------------------------
// ------------------------------------------
// Test
// ------------------------------------------
public static void main(final String args[]) throws Exception {
final File file = new File("rootToDLL", "Java2Win64.dll");
LibraryLoader.loadLibrary(file);
int result = Java2Win.call.functionMaryam(42);
}
// ------------------------------------------