error LNK2019: 无法解析的外部符号 _main

1>------ 已启动生成:  项目: Beizer, 配置: Debug Win32 ------
1>  interpolation.cpp
1>h:\2 study\2 专业\3 计算机\2 导师\4 task\求根问题\beizer\beizer\interpolation.cpp(5): warning C4081: 应输入“标识符”；找到“(”
1>h:\2 study\2 专业\3 计算机\2 导师\4 task\求根问题\beizer\beizer\interpolation.cpp(71): warning C4244: “参数”: 从“time_t”转换到“unsigned int”，可能丢失数据
1>MSVCRTD.lib(crtexe.obj) : error LNK2019: 无法解析的外部符号 _main，该符号在函数 ___tmainCRTStartup 中被引用
1>H:\2 study\2 专业\3 计算机\2 导师\4 Task\求根问题\Beizer\Debug\Beizer.exe : fatal error LNK1120: 1 个无法解析的外部命令
========== 生成:  成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ==========

操作方法

  • 01

    测试代码如下（代码来源于网络）： #include<windows.h> #include<stdlib.h> #include<time.h> #define NUM 10 #pragma(lib, "MSVCRTD.lib"); LRESULT CALLBACK Winproc(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstanc, LPSTR lpCmdLine, int nShowCmd) { MSG msg; static TCHAR szClassName[] = TEXT("::Bezier样条计算公式由法国雷诺汽车公司的工程师Pierm Bezier于六十年代提出"); HWND hwnd; WNDCLASS wc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); wc.hInstance = hInstance; wc.lpfnWndProc = Winproc; wc.lpszClassName = szClassName; wc.lpszMenuName = NULL; wc.style = CS_HREDRAW | CS_VREDRAW; if (!RegisterClass(&wc)) { MessageBox(NULL, TEXT("注册失败"), TEXT("警告框"), MB_ICONERROR); return 0; } hwnd = CreateWindow(szClassName, szClassName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); ShowWindow(hwnd, SW_SHOWMAXIMIZED); 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; static POINT pt[NUM]; TEXTMETRIC tm; static int cxClient, cyClient; HPEN hpen; int i, j, k, n, t; switch (message) { case WM_CREATE: static int cxchar; hdc = GetDC(hwnd); GetTextMetrics(hdc, &tm); cxchar = tm.tmAveCharWidth; ReleaseDC(hwnd, hdc); case WM_SIZE: cxClient = LOWORD(lparam); cyClient = HIWORD(lparam); return 0; case WM_PAINT: hdc = GetDC(hwnd); srand(time(0)); Rectangle(hdc, 0, 0, cxClient, cyClient); for (i = 0; i < 5; i++) { SelectObject(hdc, GetStockObject(WHITE_PEN)); PolyBezier(hdc, pt, NUM); for (j = 0; j < NUM; j++) { pt[j].x = rand() % cxClient; pt[j].y = rand() % cyClient; } hpen = CreatePen(PS_INSIDEFRAME, 3, RGB(rand() % 256, rand() % 256, rand() % 256)); DeleteObject(SelectObject(hdc, hpen)); PolyBezier(hdc, pt, NUM); for (k = 0; k < 50000000; k++); } for (i = 0; i < 100; i++) { Ellipse(hdc, rand() % cxClient, rand() % cyClient, rand() % cxClient, rand() % cyClient); Pie(hdc, j = rand() % cxClient, k = rand() % cyClient, n = rand() % cxClient, t = rand() % cyClient, rand() % cxClient, rand() % cyClient, rand() % cxClient, rand() % cyClient); } if ((n = (n + j) / 2) > cxchar * 20) n = cxchar * 20; SetTextColor(hdc, RGB(rand() % 256, rand() % 256, rand() % 256)); ReleaseDC(hwnd, hdc); DeleteObject(hpen); ValidateRect(hwnd, NULL); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wparam, lparam); }

  • 02

    编译时出现如下错误： 1>MSVCRTD.lib(crtexe.obj) : error LNK2019: 无法解析的外部符号 _main，该符号在函数 ___tmainCRTStartup 中被引用

  • 03

    右击项目，打开“属性”页

  • 04

    更改上图红色框内容为/subsystem:windows。如果是刚开始默认的是/subsystem:windows 则改为/subsytem:console

  • 05

    再次编译即过通过测试，运行结果截图如下

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