自定义图标未显示在左上角或任务栏上

Question

我已经使用 windows api 创建了一个基本应用程序。它只显示一个小窗口。我从主函数开始，获取实例，创建我的 Windows 类，等等。一切都很顺利。然而，我遇到的问题是我的自定义图标不会显示在窗口的左上角或任务栏上，它只显示窗口的默认小图片。然而，它确实显示为我实际可点击的 exe 文件的图标。我使用 resedit 来制作我的资源，并创建了所有 4 个图标尺寸，因此它应该有一个尺寸合适的可用图标。我得到了句柄，

HICON hMyIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));

然后使用 WNDCLASSEX 并将句柄提供给 hIcon 和 hIconsm。 如果有什么可能导致它不显示在角落或任务栏中，请提供帮助。

#include <Windows.h>
#include <iostream>
#include "resource.h"
//globals
    MSG msg;
    HWND hwndwnd;
    HICON hMyIcon;
//Windows Procedure
LRESULT CALLBACK WndProc( HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam )
{
    switch ( message )
    {
    case WM_CLOSE:    
        exit( 0 );
        break;    
    case WM_CREATE:
        SendMessage(hwndwnd,WM_SETICON,ICON_SMALL,(LPARAM)hMyIcon);
        break;
    }
    return DefWindowProc( hwnd, message, wparam, lparam );
}

int main(int ArgumentNum, char *arg[])
{
    //get instance
    char title[500];
    GetConsoleTitleA( title, 500 );
    HWND hwndConsole = FindWindowA( NULL, title );
    HINSTANCE hInstance = (HINSTANCE)GetWindowLongPtr(hwndConsole, GWLP_HINSTANCE);
    //get icon handle
    hMyIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));
    if (hMyIcon == NULL)
    {
         std::cout<< "NULL\n";
    }
    //create & register class
    WNDCLASSEX wc;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_DROPSHADOW;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = hMyIcon;
    wc.hCursor = LoadCursor(hInstance, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
    wc.lpszMenuName = 0;
    wc.lpszClassName = "Jacob";
    wc.hIconSm = hMyIcon;
    RegisterClassEx(&wc);
    //create window
    hwndwnd = CreateWindow("Jacob", "My Window", 
    WS_OVERLAPPEDWINDOW, 520, 20, 300, 300, NULL, NULL, hInstance, NULL);
    //Tried sendmessage here as well
    //SendMessage(hwndwnd,WM_SETICON,ICON_SMALL,(LPARAM)hMyIcon);
    ShowWindow( hwndwnd, SW_SHOWNORMAL);
    UpdateWindow( hwndwnd );
    //hide console, not using to see if icon is null
    //ShowWindow( hwndConsole, 0 );
    //message loop
    while(GetMessage( &msg, hwndwnd, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

这是我的源代码。我开始怀疑我的问题是否与我的资源有关。当我使用 resedit 时，我制作了各种可能大小的图标。希望这对您有所帮助，并感谢您的耐心等待。

Answer 1

我的第一个建议是尝试加载标准图标而不是您自己的图标：

hMyIcon = LoadIcon(NULL, MAKEINTRESOURCE(IDI_ERROR));

这应该可行，并且您应该看到红色错误消息图标。

接下来要做的就是尝试以不同的方式获取实例句柄。控制台窗口是一个奇怪的品种，不要将它们与 Win32 API 的其余部分混合太多。尝试：

hInstance = GetModuleHandle(NULL);

Answer 2

• 您确定您的 LoadIcon 调用返回 != NULL 吗？
• LoadIcon总是加载一个32x32的图标，MSDN说如果hIconSm为NULL，它会检查图标资源中是否有正确大小的图标，所以也许你应该尝试设置hIconSm=NULL；
• 您可以使用 WM_SETICON

编辑：

//(Having your code from the start would have made things easier)
#include <Windows.h>
#include "resource.h"
MSG msg;
HWND hwndwnd;
HICON hMyIcon;

LRESULT CALLBACK WndProc( HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam )
{
    switch ( message )
    {
    case WM_CLOSE:    
        DestroyWindow(hwnd);//exit( 0 );
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    case WM_CREATE:
//        SendMessage(hwndwnd,WM_SETICON,ICON_SMALL,(LPARAM)hMyIcon);
        break;
    }
    return DefWindowProc( hwnd, message, wparam, lparam );
}


int main(int ArgumentNum, char *arg[]) 
{
/*
    You don't own/control the console window, don't use it's HWND if you don't have to.
    ...And there is even a function to get the HWND if you need it, no need for FindWindow

    char title[500];
    GetConsoleTitleA( title, 500 );
    HWND hwndConsole = FindWindowA( NULL, title );
    HINSTANCE hInstance = (HINSTANCE)GetWindowLongPtr(hwndConsole, GWLP_HINSTANCE);
    */
    HINSTANCE hInstance=GetModuleHandle(NULL);
    hMyIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));
    WNDCLASSEX wc;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_DROPSHADOW;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = hMyIcon;
    wc.hCursor = LoadCursor(/*hInstance*/NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
    wc.lpszMenuName = 0;
    wc.lpszClassName = "Jacob";
#if 1 //The easy way
    wc.hIconSm = NULL;//hMyIcon; LoadIcon only loads 32x32 icons, you would get the wrong icon
#else //The hard way
    wc.hIconSm = (HICON)LoadImage(hInstance,MAKEINTRESOURCE(IDI_ICON1),IMAGE_ICON,GetSystemMetrics(SM_CXSMICON),GetSystemMetrics(SM_CYSMICON),0);
#endif
    RegisterClassEx(&wc);
    //create window
    hwndwnd = CreateWindow("Jacob", "My Window", 
    WS_OVERLAPPEDWINDOW, 520 , 20, 300, 300, NULL, NULL, hInstance, NULL);
    ShowWindow(hwndwnd,SW_SHOW);
    while(GetMessage( &msg, /*hwndwnd*/NULL, 0, 0) >0 ) //normally not a good idea to specify a hwnd
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}