我用JNative调用dll里面的方法的问题，dll里有3个方法
extern "C" __declspec(dllexport) int __stdcall Calc(int a, int b) //导出函数
{
return a+b;
}
这个方法可以成功调用
调用代码
- Java code
public int Max(int a,int b){ JNative n = null; try { n = new JNative("Project1.dll", "Calc"); n.setRetVal(Type.INT); // 设置参数 int i = 0; n.setParameter(i++, Type.INT, a + ""); n.setParameter(i++, Type.INT, b + ""); n.invoke(); return Integer.parseInt(n.getRetVal()); } catch (NativeException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ if(n != null){ try { n.dispose(); } catch (NativeException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return 0; }但是调用dll里的其他方法时候控制台出现这个
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7c92ebd1, pid=4820, tid=4344
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_16-b02 mixed mode, sharing)
# Problematic frame:
# C [ntdll.dll+0xebd1]
#
# An error report file with more information is saved as hs_err_pid4820.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#
不知道为什么
这个dll里的方法如下
extern "C" __declspec(dllexport) int __stdcall ToPC(String AppPath) //导出函数
{
//String AppPath = ExtractFilePath(Application->ExeName);
int com = 0;
//String fname = AppPath + "receive";
// readTxt();
ShowMessage(AppPath);
int i = dt900comm(com,AppPath.c_str(),2,0); // 采集器文件传输到电脑
return i;
}
java调用方法如下：
- Java code
public int topc(){ JNative n = null; try { //设置c++里的对应函数 n = new JNative("Project1.dll", "ToPC"); //设置返回类型 n.setRetVal(Type.INT); // 设置参数 int i = 0; n.setParameter(i++, "c:\\"); n.invoke(); return Integer.parseInt(n.getRetVal()); } catch (NativeException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ if(n != null){ try { n.dispose(); } catch (NativeException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return 0; }调用第二个就抱那个，不知道为什么，请问谁帮帮忙啊，很急啊！今天就得交
------解决方案--------------------
帮顶
------解决方案--------------------
dll 里面的那个参数String类型 改成char* 试试看