将标准输出重定向到编辑控件 (Win32).马克二世 [英] Redirect stdout to an edit control (Win32). Mark II
问题描述
我已经看到一个完全类似的问题已经存在:将标准输出重定向到一个编辑控件(Win32)
I've seen a question exactly like this already exists: Redirect stdout to an edit control (Win32)
然而，给出的解决方案要求程序员实现一个 my_printf 函数，该函数执行 {printf;从管道读取以编辑控件}.我不能这样做，因为我的 printf 位于外部库中.
However, the solution given requires the programmer to implement a my_printf function that does a {printf; read from pipe to edit control}. I cannot do that because my printf's are in a external library.
理想情况下，我在考虑:
Ideally, I'm thinking of:
- 将应用的标准输出重定向到编辑控件
- 运行应用程序，瞧
但是如果编辑控件的 API 只允许你向它写入一个字符串，我会想到这样的:
But if edit control's API only allows you to write a string to it, I would think of something like:
1 - 将标准输出复制到管道输出描述符
3 - 从描述符中的管道读取到缓冲区
4 - 从缓冲区写入编辑控件
1 - dup'ing stdout to a pipe out descriptor
3 - read from pipe in descriptor into a buffer
4 - write from buffer to edit control
但是，这里缺少第 2 步:
However, there is a missing step 2 there:
2 - 获取该管道输出描述符何时完成写入的信号.
2 - getting a signal of when a write to that pipe out descriptor is done.
我怎样才能自动化那部分.我可以在这里使用类似套接字 select 的东西吗?
How could I automate that part. Could I use something like a socket select here?
所以，根据 David Heffernan 的评论，我会有类似的内容:
So, according to David Heffernan's comments, I would have something like:
#define MYPRINT 1
#define WM_MYMESSAGE (WM_USER+1)
INT_PTR CALLBACK Foo::DialogProc(
...
case WM_COPYDATA:
{
PCOPYDATASTRUCT pMyCDS = (PCOPYDATASTRUCT) lParam;
LPCSTR szString = (LPCSTR)(pMyCDS->lpData);
AppendLog(szString);
}
break;
...
}
/* static */
void Foo::MainThread()
{
// Create worker thread
DWORD dwThreadId = 0;
m_hRedirectStdoutThread = CreateThread(
// default security
NULL,
// default stack size
0,
// routine to execute
(LPTHREAD_START_ROUTINE) &CTracesConsole::RedirectStdoutThreadRun,
// thread parameter
NULL,
// immediately run the thread
0,
// thread Id
&dwThreadId);
if (NULL == m_hRedirectStdoutThread)
{
printf("Error creating stdin thread\n");
return;
}
// Loop forever
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
/* static */
void Foo::RedirectStdoutThreadRun()
{
// Redirect stdout to pipe
int fds[2];
_pipe(fds, 1024, O_TEXT);
_dup2(fds[1], 1); // 1 is stdout
char buffer[1024];
for (;;)
{
// Need to flush the pipe
_flushall();
// Read stdout from pipe
DWORD dwNumberOfBytesRead = 0;
dwNumberOfBytesRead = _read(fds[0], buffer, 1024 - 1);
buffer[dwNumberOfBytesRead] = 0;
// Send data as a message
COPYDATASTRUCT myCDS;
myCDS.dwData = MYPRINT;
myCDS.cbData = dwNumberOfBytesRead + 1;
myCDS.lpData = buffer;
PostMessage(g_hWindow,
WM_MYMESSAGE,
0,
(LPARAM)(LPVOID) &myCDS);
}
}
其中 AppendLog 将字符串写入编辑控件.
Where AppendLog writes a string to the edit control.
此代码现在可以正常工作.有一点不便，当我从 libcurl 重定向标准输出跟踪时，libcurl 停止工作:) 但那是另一回事了...
This code works properly now. With the little inconvenience that, when I redirect stdout traces from libcurl, libcurl stops working :) But that's another story...
推荐答案
据我所知，您无法通过管道获得通知".如果您确实想这样做，也许您应该改用 WM_COPYDATA，这也将提供更简单的解决方案.当文本被发布到您的窗口时，您将收到一条消息，然后您可以将其附加到编辑控件中.
As far as I'm aware you can't get 'notifications' with a pipe. If you do want to do that maybe you should use WM_COPYDATA instead which would also provide a simpler solution. You will get a message when text is posted to your window which you can then append to the edit control.
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