LabVIEW 消息处理函数 dll callback
我在LabVIEW中通过dll调用，捕获了wm_paint消息！但程序却变得异常！请各位指教！现将dll代码贴上！#include "windows.h"
static WNDPROC prevProc;
static xx=1;
_declspec(dllexport) LRESULT CALLBACK WinSunProc(HWND hWnd,UINT uMsg,WPARAM wParam, LPARAM lParam )//
{
HDC hdc;
PAINTSTRUCT ps;
f(uMsg==WM_PAINT)
{
hdc=::BeginPaint(hWnd,&ps);
::LineTo(hdc,50*xx,50*xx);
xx++;
::EndPaint(hWnd,&ps);
xx=+5;
return 1;
}
else {
return prevProc(hWnd,uMsg,wParam,lParam);
}
}
_declspec(dllexport) int SetWinLong(HWND hWnd)
{
prevProc=(WNDPROC)::GetWindowLong(hWnd,GWL_WNDPROC);
SetWindowLong(hWnd,GWL_WNDPROC,(LONG)WinSunProc);
return(1);
}
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