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What is an undefined reference/unresolved external symbol error and how do I fix it?
(32个答案)
4年前关闭。
这是我第一次学习编码WINAPI,所以我不明白我遇到了什么错误。
错误LNK2001:无法解析的外部符号“ long stdcall WinProc(struct HWND *,unsigned int,unsigned int,long)”(?WinProc @@ YGJPAUHWND __ @@ IIJ @ Z)
请帮我。
非常感谢。
但是您将其作为实际功能:
(32个答案)
4年前关闭。
这是我第一次学习编码WINAPI,所以我不明白我遇到了什么错误。
错误LNK2001:无法解析的外部符号“ long stdcall WinProc(struct HWND *,unsigned int,unsigned int,long)”(?WinProc @@ YGJPAUHWND __ @@ IIJ @ Z)
请帮我。
#include <Windows.h>
LRESULT CALLBACK WinProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPreInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("HelloWorld");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc = WinProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass(&wndclass))
{
MessageBox (NULL, TEXT("The program requires Windows"), szAppName,MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName,TEXT("The hello World program"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,iCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch(msg)
{
case WM_CREATE:
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
GetClientRect(hwnd,&rect);
DrawText(hdc,TEXT("Hello World"),-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,msg,wParam,lParam);
}
int main()
{
MessageBox(NULL, "Hello, world!", "Hello world", MB_OK);
}
非常感谢。
最佳答案
检查您的拼写。您声明了一个名为WinProc
的函数,但实现名为WndProc.
您声明并使用了以下代码:
LRESULT CALLBACK WinProc(HWND, UINT, WPARAM, LPARAM);
//...
wndclass.lpfnWndProc = WinProc;
但是您将其作为实际功能:
LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam,LPARAM lParam)
10-08 09:17