为什么我的Win32(c ++，Visual Studio 2013)窗口没有显示？

Why isn't my Win32(c++, visual studio 2013) Window showing up?

本文关键字：窗口 2013 显示 Studio Visual Win32 我的 为什么      更新时间：2023-10-16

代码如下:

#include <windows.h>
#include <windowsx.h>

// the WindowProc callback function prototype
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
// win32 entry point
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){
    ///*
    // window handler
    HWND hwnd;
    // struct for window information
    WNDCLASSEX wc;
    // clear out the window class for use
    ZeroMemory(&wc, sizeof(WNDCLASSEX));
    // setting wc struct with window values/properties
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "TestWindow";
    wc.lpfnWndProc = WindowProc;
    // register window before creation/use
    RegisterClassEx(&wc);
    // creating the window class
    hwnd = CreateWindowEx(NULL, "TestWindow", "First Win32 Program", WS_OVERLAPPEDWINDOW, 100, 100, 1000, 1000, NULL, NULL, hInstance, NULL);
    // show the window 
    ShowWindow(hwnd, nCmdShow);//*/
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam){
    return 0;
}

下面是编译器/调试/运行时控制台输出:

'wintest.exe' (Win32): Loaded 
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64ntdll.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64kernel32.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64KernelBase.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64user32.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64gdi32.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64lpk.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64usp10.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64msvcrt.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64advapi32.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64sechost.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64rpcrt4.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64sspicli.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64cryptbase.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64msvcr120d.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64imm32.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64msctf.dll'. Cannot find or open the PDB file.
'wintest.exe' (Win32): Loaded 'C:WindowsSysWOW64uxtheme.dll'. Cannot find or open the PDB file.
The program '[3484] wintest.exe' has exited with code 0 (0x0).

这是一个非常基本的简单程序，它所做的就是从左上角开始弹出一个1000x1000大小的win32窗口。

我看到的第一个错误是在您的窗口程序中。任何您没有显式处理的消息都应该传递给DefWindowProc。

LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
    return DefWindowProc(hwnd, message, wparam, lparam);
}

这是窗口过程所需的绝对最小值。在现实中，您至少需要处理WM_CLOSE和WM_DESTROY，然后在添加功能时还要处理更多。

你的破窗过程导致CreateWindowEx在创建过程中将WM_NCCREATE消息发送到窗口时失败。

另一个明显的问题是根本不执行任何错误检查。忽略你所做的每个API调用的返回值，你没有任何方法来诊断你的程序在哪里失败。

最后，你没有包含消息循环。因此，即使您可以让窗口显示出来，进程也会立即终止。

程序将显示一个窗口。显然，还有更多的工作要做，但这是一个开始。

#include <windows.h>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
    switch(message)
    {
        case WM_CLOSE:
            DestroyWindow(hwnd);
            return 0;
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hwnd, message, wparam, lparam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, 
    int nCmdShow)
{
    WNDCLASSEX wc = { sizeof(WNDCLASSEX) };
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "TestWindow";
    wc.lpfnWndProc = WindowProc;
    if (!RegisterClassEx(&wc))
        return 1;
    HWND hwnd = CreateWindowEx(0, "TestWindow", "First Win32 Program", 
        WS_OVERLAPPEDWINDOW, 100, 100, 1000, 1000, NULL, NULL, hInstance, NULL);
    if (!hwnd)
        return 1;
    ShowWindow(hwnd, nCmdShow);
    MSG msg;
    while (GetMessage(&msg, 0, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}
相关文章：