Comment afficher une boîte de dialogue openfile sur Windows?

Question

J'essaye d'obtenir une boîte de dialogue openfile pour apparaître sur Windows CE 6.0 selon msdn c'est le même processus que dans win32, mais cela ne fonctionne pas. Je soumets à l'examen de la partie interressant du code:

#include <windows.h> 
#include <commctrl.h> 
#include <winuser.h> 
#include <stdio.h> 
#include <Commdlg.h> 

/* Prototypes */ 
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); 
HWND create_window(int width, int height) ; 
void resize_window(int width, int height) ; 

HWND g_hWindow ; 

/* Function to modify the host window size to match the size of the movie. */ 
void resize_window(int width, int height) 
{ 
    RECT r; 
    r.left = r.top = 0; 
    r.right = width ; 
    r.bottom = height ; 
    AdjustWindowRectEx(&r,WS_BORDER,false,WS_EX_CLIENTEDGE); 
    SetWindowPos(g_hWindow, NULL, 0,0,r.right, r.bottom,SWP_NOMOVE|SWP_NOOWNERZORDER|SWP_NOZORDER); 
} 


HWND create_window(int width, int height) 
{ 
    WNDCLASS wce; // A Window class in Windows CE 

    wce.style   = CS_VREDRAW | CS_HREDRAW; 
    wce.lpfnWndProc = (WNDPROC) WndProc; 
    wce.cbClsExtra = 0; 
    wce.cbWndExtra = 0; 
    wce.hInstance  = GetModuleHandle(NULL); 
    wce.hIcon   = LoadIcon((HINSTANCE) NULL, (LPCWSTR)MB_ICONQUESTION); 
    wce.hCursor  = LoadCursor((HINSTANCE) NULL, IDC_ARROW); 
    wce.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); 
    wce.lpszMenuName = 0; 
    wce.lpszClassName = _TEXT("TEST"); 

    if (!RegisterClass(&wce)) return 0; 

    RECT r; 
    r.left = r.top = 0; 
    r.right = width ; 
    r.bottom = height ; 
    AdjustWindowRectEx(&r,WS_BORDER,false,WS_EX_CLIENTEDGE); 

    // Create the window 
    g_hWindow = CreateWindowEx(
     0,   // Ex Styles 
     WS_BORDER,  // creates a window that has a thin-line border with no title bar 
     CW_USEDEFAULT, // x 
     CW_USEDEFAULT, // y 
     r.right-r.left, // Height 
     r.bottom-r.top, // Width 
     NULL,   // Parent Window 
     NULL,   // Menu, or windows id if child 
     GetModuleHandle(NULL),  // 
     NULL   // Pointer to window specific data 
    ); 

    ShowWindow(g_hWindow, SW_SHOW ); // make the window visible on the display 

    return g_hWindow ; 
} 

/* 
* Messaging function call back from Windows CE that is passed as 
* an argument when the window is created 
*/ 
LRESULT CALLBACK WndProc(HWND hWnd, 
         UINT msg, 
         WPARAM wParam, 
         LPARAM lParam) 
{ 

    switch(msg) 
    { 
    case WM_ACTIVATEAPP: 


      // Invalidate to get new text painted. 
     this->Invalidate(); 
     break; 

    case WM_DESTROY: 
     PostQuitMessage(0); 
     break; 

    case WM_CREATE: 
     LPOPENFILENAME opendialog; 
     wchar_t szFile[260]; 


     opendialog = (LPOPENFILENAME) malloc(sizeof (LPOPENFILENAME)); 
     opendialog->lStructSize = sizeof (LPOPENFILENAME); 
     opendialog->hwndOwner = g_hWindow; 
     opendialog->hInstance = GetModuleHandle(NULL); 
     *szFile = (char_t)_TEXT("\0"); 
     opendialog->lpstrFile = szFile; 
     opendialog->nFilterIndex = 0; 
     opendialog->nMaxFile = 256; 
     opendialog->lpstrInitialDir = NULL; 
     opendialog->Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST; 

     GetOpenFileName(opendialog); 


    default: 
     return DefWindowProc(hWnd, msg, wParam, lParam); 
    } 
    return 0; 
} 

/* Function to hide (or make visible) the taskbar so that the player has the full display */ 
void set_display(bool set_full) 
{ 
    HWND hwndTaskbar = ::FindWindow(L"HHTaskBar", NULL); 
    if (set_full) 
    { 
     ::ShowWindow(hwndTaskbar, SW_HIDE); 
    } 
    else 
    { 
     ::ShowWindow(hwndTaskbar, SW_SHOW); 
    } 
    g_full_scrn = set_full; 
} 


int _cdecl WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR argv, int argc) 
{ 

    memset(&g_gfx_context,0,sizeof(g_gfx_context)); 
    create_window(1, 1); // This is a windows CE specific call. 
} 

Answer 1

LPOPENFILENAME opendialog; 
mb_char_t szFile[260]; 

opendialog = (LPOPENFILENAME) mb_malloc(sizeof (LPOPENFILENAME)); 
opendialog->lStructSize = sizeof (LPOPENFILENAME); 

Vous déclarez un pointeur à une structure OPENFILENAME ici, et l'allocation de mémoire pour elle.

Vous devriez être en mesure d'allouer OPENFILENAME sur pile directement, comme ceci:

OPENFILENAME opendialog = {0}; 
mb_char_t szFile[260] = {0}; 

opendialog.lStructSize = sizeof (opendialog); 
opendialog.hwndOwner = g_hWindow; 
opendialog.hInstance = GetModuleHandle(NULL); 
opendialog.lpstrFile = szFile; 
opendialog.nFilterIndex = 0; 
opendialog.nMaxFile = 256; 
opendialog.lpstrInitialDir = NULL; 
opendialog.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST; 

GetOpenFileName(&opendialog); 

Answer 2

est ici un problème:

opendialog->lStructSize = sizeof (LPOPENFILENAME); 

Cela va définir la taille de struct à la taille d'un pointeur, ce qui est 4 dans votre cas. Vous devriez avoir:

opendialog->lStructSize = sizeof (OPENFILENAME);