Question

我创建了一个带有编辑框和两个按钮的对话框。保存并加载按钮。

单击保存时，我想将编辑框中的文本保存到txt文件，然后加载，将txt文件加载到编辑框中。现在保存/加载按钮似乎不起作用。保存按钮似乎创建了一个名为“u”的文件，而不是保存到所选文件，并且在选择文件后，加载按钮不会执行任何操作。以下是我到目前为止的情况：

#include <Windows.h>
#include <commdlg.h>
#include <fstream>
#include <string>
#include "resource.h"
using namespace std;

// Globals
HWND ghMainWnd = 0;
OPENFILENAME ofn;


// Handles
static HWND hEditBox    = 0;
static HWND hSaveButton = 0;
static HWND hLoadButton = 0;

// Contains file.
char szFile[100];

void save()
{

    char text[260];

    GetWindowText( hEditBox, text, 260 );

    ofstream saveFile( szFile, ios_base::binary );

    int length = strlen( text );
    saveFile.write( (char*)&length, sizeof(length) );
    saveFile.write( text, length );

}

void load()
{

    char text[260];

    ifstream loadFile( szFile, ios_base::binary );

    int length = 0;
    loadFile.read((char*)&length, sizeof(length));

    loadFile.read( text, length );

    text[length] = '\0';

    SetWindowText( hEditBox, text );
}

BOOL CALLBACK
WndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{

    ZeroMemory( &ofn , sizeof( ofn ) );

    ofn.lStructSize     = sizeof( ofn );
    ofn.hwndOwner       = hWnd;
    ofn.lpstrFile       = szFile;
    ofn.lpstrFile[0]    = '\0';
    ofn.nMaxFile        = sizeof( szFile );
    ofn.lpstrFilter     = "All\0*.*\0Text\0*.TXT\0";
    ofn.nFilterIndex    = 1;
    ofn.lpstrFileTitle  = "Open/Save File Dialog";
    ofn.nMaxFileTitle   = 0;
    ofn.lpstrInitialDir = NULL;
    ofn.Flags           = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;

    switch( msg )
    {
    case WM_INITDIALOG:
        hEditBox    = GetDlgItem( ghMainWnd, IDC_EDIT );
        hSaveButton = GetDlgItem( ghMainWnd, ID_SAVE );
        hLoadButton = GetDlgItem( ghMainWnd, ID_OPEN );
    return true;

    case WM_COMMAND:
        switch( LOWORD( wParam ) )
        {
        case ID_SAVE:
            GetSaveFileName( &ofn );
            save();
        return true;

        case ID_OPEN:
            GetOpenFileName( &ofn );
            load();
        return true;
        }
    return true;

    case WM_CLOSE:
        DestroyWindow( hWnd );
    return true;

    case WM_DESTROY:
        PostQuitMessage( 0 );
    return true;
    }

    return false;
}

INT WINAPI
WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR cmdLine, int showCmd )
{

    ghMainWnd = CreateDialog( hInstance, MAKEINTRESOURCE( IDD_TXTDLG ), 0, WndProc );
    ShowWindow( ghMainWnd, showCmd );

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

    while( GetMessage( &msg, 0, 0, 0 ) )
    {
        if( ghMainWnd == 0 || !IsDialogMessage( ghMainWnd, &msg ) )
        {
            TranslateMessage( &msg );
            DispatchMessage( &msg );
        }
    }

    return (int)msg.wParam;
}

Answer 1

您可以看到正在发生的事情的最佳方法是在通话之前显示文件的名称。您可以在调试器中执行此操作并查看它是什么，并查看它是否错误。它将帮助您了解问题是调用函数还是读取名称。我不记得char可以和GetWindowText一起使用（也许在非Unicode中也可以。）

您还需要添加处理以检查字符串是否为空以防万一。甚至可以验证名称是否有效。

保存/加载对话框文本文件

1 个答案: