几种获取EDIT文本的方法

标 题： 几种获取 EDIT 文本的方法
作 者：dummy
时 间：2005-12-21 10:10

链 接：http://bbs.pediy.com/showthread.php?threadid=19597

1. GetWindowText

2. SendMessage

//刚刚发现，这个有问题。

//无法成功。。。，不知为什么

//3. DispatchMessage

//MSG msg;

//msg.hwnd = hedit;

//msg.message = WM_GETTEXT;

//msg.wParam = (WPARAM)cchTextMax;

//msg.lParam = (LPARAM)lpszText;

//DispatchMessage(&msg);

4.GetWindowLong

LONG lWndProc;

if (NULL != (lWndProc = GetWindowLong(hedit, GWL_WNDPROC)))

CallWindowProc((WNDPROC)lWndProc, hedit, WM_GETTEXT, (WPARAM)cchTextMax, (LPARAM)lpszText);

6.GetClassInfo、GetClassInfoEx(两者有部分差异)

//GetClassInfo

WNDCLASS wc;

GetClassInfo(hInstance, "EDIT", &wc);

CallWindowProc(wc.lpfnWndProc, hedit, WM_GETTEXT, (WPARAM)cchTextMax, (LPARAM)lpszText);

//GetClassInfoEx 参看 GetClassInfo

6.自己写 EDIT 窗口文本获取的处理过程

可以从 windows 的源码中发现, 我在 editec.c 和 edecrare.c 中摘的，详细情况自己看吧 ^_^

case WM_GETTEXT:

/*

* wParam - max number of _bytes_ (not characters) to copy

* lParam - buffer to copy text to. Text is 0 terminated.

*/

lreturn = (LONG)ECGetText(ped, wParam, (LPSTR)lParam, TRUE);

break;

/////////////////////////////////////////////////////////////////////////////

/***************************************************************************\

* ECGetText AorW

*

* Copies at most maxCchToCopy chars to the buffer lpBuffer. Returns

* how many chars were actually copied. Null terminates the string based

* on the fNullTerminate flag:

* fNullTerminate --> at most (maxCchToCopy - 1) characters will be copied

* !fNullTerminate --> at most (maxCchToCopy) characters will be copied

*

* History:

\***************************************************************************/

ICH ECGetText(

PED ped,

ICH maxCchToCopy,

LPSTR lpBuffer,

BOOL fNullTerminate)

{

PSTR pText;

if (maxCchToCopy) {

/*

* Zero terminator takes the extra byte

*/

if (fNullTerminate)

maxCchToCopy--;

maxCchToCopy = min(maxCchToCopy, ped->cch);

/*

* Zero terminate the string

*/

if (ped->fAnsi)

*(LPSTR)(lpBuffer + maxCchToCopy) = 0;

else

*(((LPWSTR)lpBuffer) + maxCchToCopy) = 0;

pText = ECLock(ped);

RtlCopyMemory(lpBuffer, pText, maxCchToCopy*ped->cbChar);

ECUnlock(ped);

}

return maxCchToCopy;

}