怎样消除警告信息？！

[shurphey]

#include<windows.h>
#include<string.h>
#include<stdio.h>
#include<stdlib.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
HWND hwnd;
MSG Msg;
WNDCLASS wndclass;
char lpszClassName[]="Basic Draw";
char lpszTitle[]="My_Drawing";
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.lpszClassName=lpszClassName;
wndclass.lpszMenuName=NULL;
wndclass.style=0;
if(!RegisterClass(&wndclass))
{
MessageBeep(0);
return FALSE;
}
hwnd=CreateWindow(lpszClassName,lpszTitle,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hDC;
PAINTSTRUCT ps;
HPEN hP;
HBRUSH hB;
switch(message)
{
case WM_PAINT:
hP=CreatePen(PS_DASHDOT,1,RGB(0,255,0));
hB=CreateHatchBrush(HS_CROSS,RGB(255,0,0));
SetMapMode(hDC,MM_TEXT);
Rectangle(hDC,130,60,270,200);
SelectObject(hDC,hB);
Ellipse(hDC,130,70,270,190);
SelectObject(hDC,hP);
MoveToEx(hDC,100,130,NULL);
LineTo(hDC,300,130);
MoveToEx(hDC,200,30,NULL);
LineTo(hDC,200,230);
EndPaint(hwnd,&ps);
break;
case WM_DESTROY:
DeleteObject(hP);
DeleteObject(hB);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return 0;
}
在这个程序编译时产生了三条警告信息：'hDC'used without having been initialied.
同时'hB'和'hB'也出现相同的警告信息。
我想问一下各位大虾，这句警告是什么意思？我使用VC＋＋编译时，不能link成exe文件好像就是这几句警告的关系！谢谢！

[imRainman]

hDC没有初始化~~~~

仁兄hdc因该先获取一下hdc句柄

[Dong]

#pragma warning(disable:4001~~4999)

[fallhunter]

楼主看不懂么？用hDC之前应该先初始化啊

hdc = GetDC（hWnd);

[xuzheng318]

#pragma warning(disable: xxxx)

[sharkhuang]

#pragma warning(disable: xxxx)还是要小心用。warning还是要消除的，除非编译器的bug。

[shurphey]

TextOutCHN.obj : error LNK2001: unresolved external symbol "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z)
fatal error LNK1120: 1 unresolved externals
这两个是在link时出现的错误分别表示什么意思？

[mathe]

你的拼写错了，WndProc写成WidProc

[shurphey]

加入了hDC的初始化语句hDC=GetDC(hwnd)和hB=(HBRUSH)GetStockObject(WHITE_BRUSH)，hP=(HPEN)GetStockObject(BLACK_PEN);，现在警告消除了，谢谢指导！可是还是不能编译exe文件啊。为什么？！为什么……