第一种方法:将主程序的窗口句柄传递到DLL中去,通过发送自定义消息传递参数 第二种方法:主程序启动一个线程去主动获得DLL中的数据。 第三种方法:创建回调函数,通过该回调函数传递参数。例如这样一个动态库代码: // TestCallBack.cpp : Defines the initialization routines for the DLL. //#include "stdafx.h" #include <afxdllx.h> #include "process.h"#ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif typedef int (*CallBackFunc )(int nTmp); CallBackFunc theFunc; static void FuncThread(LPVOID lParam); static AFX_EXTENSION_MODULE TestCallBackDLL = { NULL, NULL };extern "C" int APIENTRY DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved) { // Remove this if you use lpReserved UNREFERENCED_PARAMETER(lpReserved); if (dwReason == DLL_PROCESS_ATTACH) { TRACE0("TESTCALLBACK.DLL Initializing!\n");
// Extension DLL one-time initialization if (!AfxInitExtensionModule(TestCallBackDLL, hInstance)) return 0; // Insert this DLL into the resource chain // NOTE: If this Extension DLL is being implicitly linked to by // an MFC Regular DLL (such as an ActiveX Control) // instead of an MFC application, then you will want to // remove this line from DllMain and put it in a separate // function exported from this Extension DLL. The Regular DLL // that uses this Extension DLL should then explicitly call that // function to initialize this Extension DLL. Otherwise, // the CDynLinkLibrary object will not be attached to the // Regular DLL's resource chain, and serious problems will // result. new CDynLinkLibrary(TestCallBackDLL); } else if (dwReason == DLL_PROCESS_DETACH) { TRACE0("TESTCALLBACK.DLL Terminating!\n"); // Terminate the library before destructors are called AfxTermExtensionModule(TestCallBackDLL); } return 1; // ok } int WINAPI CallBackTmp(CallBackFunc f) { theFunc=f; _beginthread(FuncThread,0,NULL); return 1; }void FuncThread(LPVOID lParam) { theFunc(10); }
然后:PostMessage( hWnd , wParam , lParam ) ;
第二种方法:主程序启动一个线程去主动获得DLL中的数据。
第三种方法:创建回调函数,通过该回调函数传递参数。例如这样一个动态库代码:
// TestCallBack.cpp : Defines the initialization routines for the DLL.
//#include "stdafx.h"
#include <afxdllx.h>
#include "process.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
typedef int (*CallBackFunc )(int nTmp);
CallBackFunc theFunc;
static void FuncThread(LPVOID lParam);
static AFX_EXTENSION_MODULE TestCallBackDLL = { NULL, NULL };extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
// Remove this if you use lpReserved
UNREFERENCED_PARAMETER(lpReserved); if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("TESTCALLBACK.DLL Initializing!\n");
// Extension DLL one-time initialization
if (!AfxInitExtensionModule(TestCallBackDLL, hInstance))
return 0; // Insert this DLL into the resource chain
// NOTE: If this Extension DLL is being implicitly linked to by
// an MFC Regular DLL (such as an ActiveX Control)
// instead of an MFC application, then you will want to
// remove this line from DllMain and put it in a separate
// function exported from this Extension DLL. The Regular DLL
// that uses this Extension DLL should then explicitly call that
// function to initialize this Extension DLL. Otherwise,
// the CDynLinkLibrary object will not be attached to the
// Regular DLL's resource chain, and serious problems will
// result. new CDynLinkLibrary(TestCallBackDLL);
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("TESTCALLBACK.DLL Terminating!\n");
// Terminate the library before destructors are called
AfxTermExtensionModule(TestCallBackDLL);
}
return 1; // ok
}
int WINAPI CallBackTmp(CallBackFunc f)
{
theFunc=f;
_beginthread(FuncThread,0,NULL);
return 1;
}void FuncThread(LPVOID lParam)
{
theFunc(10);
}
PeekMessage呢