如何在不同的线程中执行

问题描述

嗨！

我想为WriteDataToPort创建一个单独的线程。如何创建cstring并将其作为参数传递给它。

下面是我的代码片段。

Hi!
I would like to create a separate thread for WriteDataToPort. How to create and pass cstring as parameter to it.
Below is my code snippet.

CString ss=_T("");
while(!feof(fpRead))
{
	size_t count = fread(file_buffer, sizeof(char), l_size, fpRead);
	for(int i=0; i< count; i++)
	{
		ss = file_buffer[i];
		m_CommPort->WriteDataToPort(ss.GetBuffer(ss.GetLength()));
	}
}

void CCommPort::WriteDataToPort(TCHAR* f_WriteData)
{
	WaitForSingleObject(m_hWriteCompleteEvent,INFINITE);
	ResetEvent(m_hWriteCompleteEvent);
	m_bKeyboardWrite =TRUE;
	memset(m_szWriteBuff, 0, sizeof(m_szWriteBuff));
	tcscpy(m_szWriteBuff, f_WriteData);
	SetEvent(m_hWriteEvent);
}

i have tried in this way, but getting exception. Please do the needful.
hThread = CreateThread(NULL,0,WriteDataToPortThread,LPVOID)ss.GetBuffer(ss.GetLength()),0,NULL);

DWORD __stdcall CMainFrame::WriteDataToPortThread(LPVOID lpParam)
{
    CString* ss = (CString*)lpParam;
    ((CMainFrame*)AfxGetMainWnd())->m_CommPort->WriteDataToPort(ss->GetBuffer(ss->GetLength()));
    return 0;
}

非常感谢

Sam。

Thanks much
Sam.

推荐答案

AfxBeginThread(YourThreadFunction, &g_MyString, THREAD_PRIORITY_NORMAL); 

3）在您的线程函数内（例如YourThreadFunction），在开头将LPVOID p转换为CString *然后您可以将它用作指向您线程中字符串的指针'循环：

3) inside your thread function (e.g. YourThreadFunction), cast LPVOID p to CString * in the beginning and then you can use it as a pointer to string in your thread''s loop:

INT YourThreadFunction(LPVOID p)
{
     CString *pStr = (CString *)p;
     while (!gCancel)
     {
          // your loop
     }
     return 0;
}

它当然是粗糙的，但你明白了。所有关于同时访问，重新分配等的常见注意事项仍然适用。



我通常会创建一个线程接口类，其中包含传递数据所需的所有内容两个线程之间 - 可能包含字符串等。

It is of course crude as, but you get the idea. All the usual pre-cautions about simultaneous access, reallocation and so on will still apply.

I normally create a thread interface class that contains everything that is needed to pass data between 2 threads - which could contain strings amongst other things.

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