我用c编写了一些代码来制作简单的win32窗口，但失败了

Question

我收到此错误：

LNK1120：第 1 行上有 1 个未解析的外部

错误 LNK2019：未解析的外部符号_winproc@20在函数 _WinMain@16 C：\Users\giorgi\Documents\Visual Studio 2013\Projects\Hello\Hello\Source.obj 你好

我是WinApi的新手，请帮忙。

#include <windows.h>

LRESULT CALLBACK winproc(WNDPROC lpPrevWndFunc, HWND hwnd, UINT msg, WPARAM wp, LPARAM lp);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR LpCmdLine, int nCmdShow)
{
WNDCLASSEX class;
ZeroMemory(&class, sizeof(WNDCLASSEX));
class.cbSize = sizeof(WNDCLASSEX);
class.style = CS_HREDRAW | CS_VREDRAW;
class.lpfnWndProc = (WNDPROC)winproc;
class.cbClsExtra = 0;
class.cbWndExtra = 0;
class.hInstance = hInstance;
class.hIcon = NULL;
class.hCursor = LoadCursor(NULL, IDC_ARROW);
class.hbrBackground = (HBRUSH)COLOR_WINDOW;
class.lpszClassName = "window class";
class.lpszMenuName = NULL;
class.hIconSm = NULL;
RegisterClassEx(&class);

HWND hwnd = CreateWindowEx
    (
    WS_EX_ACCEPTFILES,
    "window class",
    "window",
    WS_OVERLAPPED,
    200,
    200,
    800,
    600,
    NULL,
    NULL,
    hInstance,
    NULL
    );

ShowWindow(hwnd, nCmdShow);

MSG msg;
ZeroMemory(&msg, sizeof(MSG));

while (GetMessage(&msg, NULL, 0, 0))
{
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}
return 0;
}

LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
switch (msg)
{
case WM_DESTROY:
{
    PostQuitMessage(0);
    return 0;
}
    break;
}
return DefWindowProc(hwnd, msg, wp, lp);
}

Answer 1

正如其他人所说，C 区分大小写，因此 winproc 和 WinProc 将是两个不同的函数。 您还需要确保 Windows 过程的签名与 Windows 的预期相匹配，因此请进行以下更改：

1. 将LRESULT CALLBACK winproc(WNDPROC lpPrevWndFunc, HWND hwnd, UINT msg, WPARAM wp, LPARAM lp);更改为LRESULT CALLBACK winProc(HWND, UINT, WPARAM, LPARAM);

2. 将class.lpfnWndProc = (WNDPROC)winproc;更改为class.lpfnWndProc = (WNDPROC)winProc;

3. 将LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)更改为LRESULT CALLBACK winProc(HWND hwnd, UINT mgs, WPARAM wp, LPARAM lp)

最后，自从我在win32-API级别编程以来已经有一段时间了，但我相信你的Windows过程应该看起来像：

    LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
    {
        switch (msg)
        {
            case WM_DESTROY:
            {
                PostQuitMessage(0);
                return 0;
            }
            break;
            default:
                return DefWindowProc(hwnd, msg, wp, lp);
        }
    }

换句话说，如果您不自己处理消息，则只想返回默认窗口过程（DefWindowProc）。