2024年1月11日发(作者：)
DLL 需传出char *类型
[DllImport(“")]
// 传出值public static extern int mySum (StringBuilder abuf, StringBuilder bbuf );
//DLL中申明
extern “C” __declspec(dllexport) int WINAPI mySum(char * astr,char * bstr)
{
//传出char * 改变astr bstr -->abuf, bbuf可以被改变 return a+b;
}
DLL 回调函数
BOOL EnumWindows(WNDENUMPROC lpEnumFunc, LPARAM lParam)
using System;
using pServices;
public delegate bool CallBack(int hwnd, int lParam); //定义委托函数类型
public class EnumReportApp
{
[DllImport("user32")]
public static extern int EnumWindows(CallBack x, int y);
public static void Main() {
CallBack myCallBack = new CallBack(); EnumWindows(myCallBack, 0);
}
public static bool Report(int hwnd, int lParam)
{
("Window handle is ");
ine(hwnd); return true;
}
}
DLL 传递结构
BOOL PtInRect(const RECT *lprc, POINT pt);
using pServices;
[StructLayout(tial)]
public struct Point { public int x;
public int y; }
[StructLayout(it)]
public struct Rect
{
[FieldOffset(0)] public int left;
[FieldOffset(4)] public int top;[FieldOffset(8)] public int right;
[FieldOffset(12)] public int bottom; }
Class XXXX {
[DllImport("")]
public static extern bool PtInRect(ref Rect r, Point p);
}
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