[求助]dll 创建窗口问题-编程技术-看雪-安全社区|安全招聘|kanxue.com

[求助]dll 创建窗口问题

发表于: 2010-3-5 14:37 4377

[求助]dll 创建窗口问题

sharenpk

2010-3-5 14:37

4377

下面代码编译成dll 我用另一个程序 LoadLibrary 123.dll 会创建窗口，用热键也可以
但是把这个 dll 注入到其他程序则不能创建窗口，注入后 MessageBox(NULL,"DLL_PROCESS_ATTACH",NULL,MB_OK); 都会提示
请问是为什么？

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// 123.cpp : Defines the entry point for the DLL application.
//
#include "stdafx.h"
#include "resource.h"
 
 
#define WH_KEYBOARD_LL 13
typedef struct tagKBDLLHOOKSTRUCT {
    DWORD vkCode;
    DWORD scanCode;
    DWORD flags;
    DWORD time;
    DWORD dwExtraInfo;  
} KBDLLHOOKSTRUCT, FAR *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;
 
 
HINSTANCE hinst = NULL;
HWND hwndDLG = NULL;
HHOOK hhook = NULL;
HANDLE hProc;
 
 
LRESULT CALLBACK mykeyproc(int,WPARAM,LPARAM);
void WINAPI start();
BOOL CALLBACK DlgProc(HWND hDlg,UINT message,WPARAM wParam,LPARAM lParam);    
extern "C" __declspec(dllexport) void ShowDlg();
 
//dll入口
BOOL APIENTRY DllMain( HANDLE hModule, 
                      DWORD  ul_reason_for_call, 
                      LPVOID lpReserved
                      )
{
    switch( ul_reason_for_call )
    {
    case DLL_PROCESS_ATTACH:
        hinst = (HINSTANCE)hModule;
        start();
        MessageBox(NULL,"DLL_PROCESS_ATTACH",NULL,MB_OK);
        break;
    case DLL_THREAD_ATTACH:
        break;
    case DLL_THREAD_DETACH:
        break;
    case DLL_PROCESS_DETACH:
        MessageBox(NULL,"DLL_PROCESS_DETACH",NULL,MB_OK);
        break;
    }
    return TRUE;
}
 
void WINAPI start()
{
    hhook = SetWindowsHookEx(WH_KEYBOARD_LL,(HOOKPROC)mykeyproc,hinst,NULL);
    ShowDlg();
    myhook();
}
 
extern "C" __declspec(dllexport) void ShowDlg()
{     
    hwndDLG = CreateDialog(hinst,MAKEINTRESOURCE(IDD_DIALOG1),NULL,(DLGPROC)DlgProc);     
    ShowWindow(hwndDLG,SW_SHOW);
}
 
BOOL CALLBACK DlgProc(HWND hDlg,UINT message,WPARAM wParam,LPARAM lParam)                         
{
    switch(message)
    {
    case WM_INITDIALOG:
        return TRUE;
    case WM_COMMAND:
        /*
        if(LOWORD(wParam)==IDOK)
        {
            MessageBox(NULL,"IDOK",NULL,MB_OK);
        }
        if(LOWORD(wParam)==IDCANCEL)
        {
            MessageBox(NULL,"IDCANCEL",NULL,MB_OK);
        }
        */
        if(LOWORD(wParam)==IDC_CHECK1)
        {
            if (IsDlgButtonChecked(hDlg,IDC_CHECK1)==BST_CHECKED)
            //if (BST_CHECKED == SendDlgItemMessage(hDlg,IDC_CHECK1,BM_GETCHECK,0,0))
            {
                MessageBox(NULL,"IDC_CHECK1",NULL,MB_OK);
            }
            else
            {
                //............................
            }
        }
        return TRUE;
    case WM_CLOSE:
        DestroyWindow(hDlg);
        hwndDLG = NULL;
        return TRUE;
    }
    return FALSE;
}
 
 
 
LRESULT CALLBACK mykeyproc(int dwCode,WPARAM wParam,LPARAM lParam)
{
    PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) lParam;
    if (dwCode == HC_ACTION)
    {
        if (wParam == WM_KEYDOWN)
        {
            if (p->vkCode == VK_MULTIPLY)
            {
                if (hwndDLG == NULL)
                {
                    ShowDlg();
                }
                else
                {
                    DestroyWindow(hwndDLG);
                    hwndDLG = NULL;
                }
                //MessageBox(NULL,"VK_NUMLOCK",NULL,MB_OK);
            }
        }
    }
    LRESULT RetVal = CallNextHookEx(hhook,dwCode,wParam,lParam);
    return RetVal;
}