vs2012 error C2065: “WndProc”: 未声明的标识符

Question

#include
using namespace std;
#include "Shape.h"
#include "Line.h"
#include "Ellipse.h"
#include "Rectangle.h"
#include
#include
#include
#include
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
WNDCLASS wndclass;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpszClassName = _T("我的窗体");
wndclass.hInstance = hInstance;
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hIcon = 0;
wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wndclass.lpszMenuName = 0;
if (RegisterClass(& wndclass)==0)
{
MessageBox(0,_T("注册窗口类失败"),_T("我的窗体"),MB_OK);
return 0;
}
HWND hWnd = CreateWindow(_T("我的窗体"),_T("窗体绘图"),WS_OVERLAPPEDWINDOW,
100, 100,500,400,0,0,hInstance,0
);
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);
MSG msg;
while (GetMessage(&msg, 0, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return  0;

}
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
CLine Line(50,90,300,90,RGB(0,0,0));
Line.Draw(hdc);
CRectangle rect(102,202,182,282,RGB(192,192,192));
rect.Draw(hdc);
CEllipse ellipse(232,202,312,282,RGB(128,128,0));
ellipse.Draw(hdc);
EndPaint(hWnd, &ps);
}

    break;
case WM_CLOSE:
    PostQuitMessage(0);     
    break;
default:
    return DefWindowProc(hWnd, uMsg, wParam, lParam);
    break;
}
return 0;

}
这是书上的一个程序，按照书上敲的，但是就是没有标识，不知道为什么

Answer 1

在你的源代码前面加上
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
要先申明下