使用Core WIN32浏览文件夹OnButtonClick [英] To Browse a Folder OnButtonClick using Core WIN32

问题描述

大家好..

我正在使用Core WIN32编程.我想在Button单击上浏览一个文件夹.这是我用来打开文件对话框的代码:

Hello Everyone..

Am using Core WIN32 Programming. And I want to browse a folder on Button click. here is the Code i used to Open a File Dialog:

#include<windows.h>
#include<windowsx.h>
#include<commctrl.h>
#include<shlobj.h>
#include <stdio.h>

     
    // Declare WndProcedure
    LRESULT CALLBACK WndProcedure(HWND hWnd, UINT uMsg,WPARAM wParam, LPARAM lParam);
     
    INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
    {
        HWND       button;
        MSG        Msg;
        HWND       hWnd;
        HRESULT    hRet;
        WNDCLASSEX WndClsEx;
     
        // Populate the WNDCLASSEX structure
        WndClsEx.cbSize        = sizeof(WNDCLASSEX);
        WndClsEx.style         = CS_HREDRAW | CS_VREDRAW;
        WndClsEx.lpfnWndProc   = WndProcedure;
        WndClsEx.cbClsExtra    = 0;
        WndClsEx.cbWndExtra    = 0;
        WndClsEx.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
        WndClsEx.hCursor       = LoadCursor(NULL, IDC_ARROW);
        WndClsEx.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
        WndClsEx.lpszMenuName  = NULL;
        WndClsEx.lpszClassName = "GlowdotWin32TutorialPartI";
        WndClsEx.hInstance     = hInstance;
        WndClsEx.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);
     
        // Register the class
        RegisterClassEx(&WndClsEx);
     
        // Create the window object
        hWnd = CreateWindow("GlowdotWin32TutorialPartI",
                  "Glowdot Win32 Tutorial - Part I",
                  WS_OVERLAPPEDWINDOW,
                  CW_USEDEFAULT,
                  CW_USEDEFAULT,
                  CW_USEDEFAULT,
                  CW_USEDEFAULT,
                  NULL,
                  NULL,
                  hInstance,
                  NULL);

		

//To Create a  button :
        button = CreateWindow( 
        "BUTTON",                                    
        "Open",                                       
        WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,    
                                                     
        800,                                         
        50,                                          
        50,                                         
        20,                                         
        hWnd,                                       
        NULL,
        hInstance,
        NULL      
    );

//To Create a Text box :
		CreateWindow(TEXT("Edit"), TEXT(""), WS_CHILD | WS_VISIBLE | WS_BORDER, 200, 50, 580, 20, hWnd, NULL, NULL, NULL); 

//To Browse for a folder :
    BROWSEINFO      bi;
    char            pszBuffer[MAX_PATH];
    LPITEMIDLIST    pidl;
    LPMALLOC        lpMalloc;
 
    // Initialize COM
    if(CoInitializeEx(0,COINIT_APARTMENTTHREADED) != S_OK)
    {
        MessageBox(NULL,("Error opening browse window"),("ERROR"),MB_OK);
        CoUninitialize();
        return 0;
    }
 
    // Get a pointer to the shell memory allocator
    if(SHGetMalloc(&lpMalloc) != S_OK)
    {
        MessageBox(NULL,("Error opening browse window"),("ERROR"),MB_OK);
        CoUninitialize();
        return 0;
    }
 
    bi.hwndOwner        =   NULL;
    bi.pidlRoot         =   NULL;
    bi.pszDisplayName   =   pszBuffer;
    bi.lpszTitle        =   ("Select a install Directory");
    bi.ulFlags          =   BIF_RETURNFSANCESTORS | BIF_RETURNONLYFSDIRS;
    bi.lpfn             =   NULL;
    bi.lParam           =   0;
     
    if(pidl = SHBrowseForFolder(&bi))
    {
        // Copy the path directory to the buffer
        if(SHGetPathFromIDList(pidl,pszBuffer))
        {
            // pszBuffer now holds the directory path
            printf(("You selected the directory: %s\n"),pszBuffer);
        }
 
        lpMalloc->Free(pidl);
    }
    lpMalloc->Release();
    CoUninitialize();

if ( !button)
           return 0;
        // Verify window creation
        if( !hWnd ) // If the window was not created,
            return 0; // stop the application
     
        // Show the window
        ShowWindow(hWnd, SW_SHOWNORMAL);
        ShowWindow(button, SW_SHOWNORMAL);
        UpdateWindow(hWnd);
        UpdateWindow(button);
        // our message pump
        while( (hRet = GetMessage( &Msg, NULL, 0, 0 )) != 0)
        { 
            if (hRet == -1)
            {
            // handle the error and possibly exit
            }
            else
            {
                TranslateMessage(&Msg); 
                DispatchMessage(&Msg); 
            }
        }
    }
     
    //////////////////
    // WndProcedure //
    //////////////////
     
    LRESULT CALLBACK WndProcedure(HWND hWnd, UINT Msg,
                   WPARAM wParam, LPARAM lParam)
    {
        switch(Msg)
        {
		
        case WM_DESTROY:

            PostQuitMessage(WM_QUIT);
            break;
        default:

            return DefWindowProc(hWnd, Msg, wParam, lParam);
        }
     
        return 0;
    }

请，有人建议我打开文件对话框打开"按钮.
在此先感谢..

Please, Someone suggest me to Open the File Dialog On button Click..

Thanks in Advance..

推荐答案

您应该:

• 将浏览器文件夹代码移动到新功能.
• 将唯一ID作为hMenu参数传递给按钮的CreateWindow调用.
• 将<消息循环(WM_COMMAND消息)中的c2>通知(wParam的高字).当wParam参数的低位字词是您的按钮ID时，请调用文件夹浏览功能.

You should:

• Move the browse for folder code to a new function.
• Pass a unique ID as hMenu parameter to the CreateWindow call for the button.
• Hanlde the BN_CLICKED notification (high word of wParam) in your message loop (WM_COMMAND message). When the low word of the wParam parameter is your button ID, call the browse for folder function.

// Define button ID
#define IDC_BROWSE_BTN	1000

// Pass button ID
button = CreateWindow(
    "BUTTON", "Open",
    WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,
    800, 50, 50, 20,
    hWnd,   
    (HMENU)IDC_BROWSE_BTN,
    hInstance,
    NULL);

BOOL BrowseForFolder()
{
    BOOL bRet = 0;
// Move the browse for folder code from WinMain to here
// Add line 'bRet = 1;' behind the printf statement when
// a directory has been choosen.
    return bRet;
}

LRESULT CALLBACK WndProcedure(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
    switch(Msg)
    {
    case WM_DESTROY:
        PostQuitMessage(WM_QUIT);
        break;
    case WM_COMMAND :
        if (HIWORD(wParam) == BN_CLICKED)
        {
            if (LOWORD(wParam) == IDC_BROWSE_BTN)
                BrowseForFolder();
        }
        break;
    default:
        return DefWindowProc(hWnd, Msg, wParam, lParam);
    }
    return 0;
}

使用 ^ ]和GWL_ID为按钮提供命令ID，例如1234.
为 WM_COMMAND 添加消息处理程序 [ ^ ]按钮的父窗口或您在任何地方进行消息处理的位置，如果LOWORD(wParam)是您为按钮提供的ID(例如1234)，则显示您的文件对话框.

Use SetWindowLong[^] with GWL_ID to give your button a command ID, like 1234.
Add a message handler for WM_COMMAND[^] to the button''s parent window or wherever you do message handling, and if LOWORD(wParam) is the ID you gave to your button (e.g. 1234), then display that file dialog of yours.

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