自定义图标不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。它只是显示一个小窗口。我从主函数开始，获取实例，创建我的 windows 类等。一切正常。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。但是，它确实显示为我的实际可点击 exe 文件的图标。我使用 resedit 来制作我的资源，并创建了所有 4 种图标大小，因此它应该有一个可用的适当大小。我掌握了

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

然后我使用 WNDCLASSEX 并将句柄交给 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，我为各种可能大小的图标疯狂。希望这会有所帮助，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，您应该会看到红色的错误消息图标。

接下来要做的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。试试：

hInstance = GetModuleHandle(NULL);

Answer 2

• 您确定您的 LoadIcon 调用返回 != NULL 吗？
• Lo​​adIcon 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；
• 你可以使用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;
}