如何向对话课发送信息 [英] How to send a message to dialogue class

问题描述

我是MFC的新手，我正在使用线程，并希望使用该线程(ThreadProc)向对话类发送消息，因此我可以使用该线程在对话类中调用函数.请告诉我要使用的消息代码.(Sendmessage(?????????????))

认为我需要发送"ON_CBN_SELCHANGE"且ID为"IDC_PType"(请阅读代码)
坦克
这是代码

Hi,
I am new to MFC, I am using a thread and want to send a message to dialogue class using that thread(ThreadProc) so i can call a function in the dialogue class using that thread. Please tell me the message code to use.(Sendmessage(?????????????))

Think i need to send "ON_CBN_SELCHANGE" and id is "IDC_PType" (Please read the code)
Tanks
Here is the code

// UMKurunegalaDlg.cpp : implementation file
//

#include "stdafx.h"
#include "UMKurunegala.h"
#include "UMKurunegalaDlg.h"
#include "afxdialogex.h"



#ifdef _DEBUG
#define new DEBUG_NEW
#endif
static int Data_Of_Thread_1 = 1;
static HANDLE Handle_Of_Thread = 0;
int val = 0;

void ThreadProc(void *param)// *** The thread i am using
{
    int h=*((int*)param);

	SendMessage(?????????????????????????????????????????????????????);
    
    _endthread();
}
		/*DWORD WINAPI setBitThread(LPVOID lpParam) 
{	
	CUMKurunegalaDlg::OnCbnEditchangePtype();
    return 0; 
} */

// CAboutDlg dialog used for App About

class CAboutDlg : public CDialogEx
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CUMKurunegalaDlg dialog




CUMKurunegalaDlg::CUMKurunegalaDlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CUMKurunegalaDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CUMKurunegalaDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	DDX_Control(pDX, teststt, testt);
	DDX_Control(pDX, IDC_VType, vtypec);
	DDX_Control(pDX, IDC_pricest, pricest);
	DDX_Control(pDX, IDC_VBrand, vbrandc);
	DDX_Control(pDX, IDC_VModel, vmodelc);
	DDX_Control(pDX, IDC_VPart, vpartc);
	DDX_Control(pDX, IDC_PType, ptypec);

}

BEGIN_MESSAGE_MAP(CUMKurunegalaDlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_CBN_SELCHANGE(IDC_VType, &CUMKurunegalaDlg::OnCbnSelchangeVtype)
	ON_CBN_SELCHANGE(IDC_VBrand, &CUMKurunegalaDlg::OnCbnSelchangeVbrand)
	ON_CBN_SELCHANGE(IDC_VModel, &CUMKurunegalaDlg::OnCbnSelchangeVmodel)
	ON_CBN_SELCHANGE(IDC_VPart, &CUMKurunegalaDlg::OnCbnSelchangeVpart)
	ON_CBN_SELCHANGE(IDC_PType, &CUMKurunegalaDlg::OnCbnSelchangePtype)
	ON_CBN_EDITCHANGE(IDC_PType, &CUMKurunegalaDlg::OnCbnEditchangePtype)
	ON_CBN_CLOSEUP(IDC_PType, &CUMKurunegalaDlg::OnCbnCloseupPtype)
END_MESSAGE_MAP()

推荐答案

我建​​议使用PostThreadMessage代替SendMessage，请检查 ^ ]出于某些原因.有关文档，请参见 http://msdn.microsoft.com /en-us/library/windows/desktop/ms644946%28v=vs.85%29.aspx [ 使用SendMessage时，代码将类似于:

I suggest to use PostThreadMessage instead of SendMessage, check PostThreadMessage Demystified[^] for reasons. For Documentation see http://msdn.microsoft.com/en-us/library/windows/desktop/ms644946%28v=vs.85%29.aspx[^]

And by the way if you want to invoke a function of your dialog class from your thread, then you need to send the "this"(present dialog object reference) as a parameter to the thread procedure. Are you sure you are doing this? Because in the code you are casting you lParam into an int which baffles me. When you call your threadproc you need to send "this" as "lParam".
With SendMessage the code would look something like :

 void ThreadProc(LPVOID lParam)
{
   CCurrentDialog* pDlg = (CCurrentDialog*)lParam;
   SendMessage(pDlg->m_hWnd,ON_CBN_SELCHANGE,NULL,NULL);
}

您可以使用 PostMessage [ ^ ].

You can use PostMessage[^] also.

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