I have some.csv files which I'm using as part of a test bench. I can open them and read them without any problems unless I've already got the file open in Excel in which case I get.
Using the 'Open File' and 'Save File' dialogs, Get. Open. File. Name and Get. Save. File. Name APIs. Recently, someone on the MSDN forum asked if there are any built- in 'Open File' and 'Save File' dialogs available in the Windows Mobile platform. The answer, of course, is yes. The APIs that get the task done are Get. Open. File. Name() and Get.
Save. File. Name(). These APIs allow the user to select directories or files for opening or saving. I wrote a small application to demonstrate how to use these APIs. The application has a multiline edit control and menu options for opening or saving text files (see video at the end). When you open a text file, the files contents are shown on the edit control, and saving to a file writes the contents of the edit control to a user selected text file.
CreateFile(), GetHandleInformation() and CloseHandle() Compiler: Visual C++ Express Edition 2005 Compiled on Platform: Windows XP Pro SP2 Header file: Standard and Windows Additional library: Windows Platform SDK Additional project setting: Set project. Recently, someone on the MSDN forum asked if there are any built-in 'Open File' and 'Save File' dialogs available in the Windows Mobile platform. The answer, of course, is yes. The APIs that get the task done are GetOpenFileName() and GetSaveFileName(). These. File System Object is used to - 1. creation, manipulation and deletion of text files 2. create, move and Delete folders on hard disk FSO is the short name for File System Object. The FSO Object Model has a rich set of properties, methods and events to process.
C# Signature (final): [DllImport('kernel32.dll', CharSet = CharSet.Auto, SetLastError = true)] public static extern IntPtr CreateFile( [MarshalAs(UnmanagedType.LPTStr)] string filename, [MarshalAs(UnmanagedType.U4)] FileAccess access, [MarshalAs.
Pretty simple. First, lets take a look at Get. Open. File. Name() API, the Do. Open. File() method in the application reads the contents of the file and writes it to the edit control, here is the function: (error checking is left out, as usual)1. Get the full path to the file. Read the contents of the file into a buffer. Convert the buffer into wide char. Display the wide chars on the edit control.
- This Java tutorial describes exceptions, basic input/output, concurrency, regular expressions, and the platform environment. Commonly Used Methods for Small Files Reading All Bytes or Lines from a File If you have a small-ish file and you would like to read its.
- FILE_SHARE_READ 0x00000001 Enables subsequent open operations on a file or device to request read access. Otherwise, other processes cannot open the file or device if they request read access. If this flag is not specified, but the file or device has been.
- To create a new file, open an existing file, or save a file, you use the fopen() function. Its syntax is: FILE *fopen(const char *FileName, const char *Mode); The first argument, FileName, must be a valid name of a file. If the user is creating or saving a new file, you can.
BOOL Do. Open. File(HWND h. Dlg){TCHAR sz. File[MAX_PATH] = TEXT("\0"); char *sz. File. Content = NULL; OPENFILENAME ofn; HANDLE h.
File = INVALID_HANDLE_VALUE; DWORD dw. File. Size = 0, bytes. To. Read = 0, bytes. Read = 0; memset( & (ofn), 0, sizeof(ofn)); ofn. Struct. Size = sizeof(ofn); ofn.
Owner = h. Dlg; ofn. File = sz. File; ofn. Max. File = MAX_PATH; ofn. Filter = TEXT("Txt (*.
Title = TEXT("Open File"); ofn. Flags = OFN_EXPLORER; //get the filename the user wants to openif (Get. Open. File. Name(& ofn)){ //ofn. File contains the full path to the file, get a handle to ith. File = Create. File(ofn. File, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (h. File == INVALID_HANDLE_VALUE)return FALSE; //get file size in bytesdw.
File. Size = Get. File. Size(h. File, NULL); sz. File. Content = (char*)malloc(dw. File. Size+1); memset(sz. File. Content, 0, dw.
File. Size+1); //read the files contents into a bufferif (Read. File(h. File, sz. File. Content, dw.
File. Size, & bytes. Read, NULL)){TCHAR *wsz. Temp = NULL; HWND h. Edit = NULL; wsz.
Temp = (TCHAR*)malloc(bytes. Read*sizeof(TCHAR)); //convert the chars in buffer to wide charsmbstowcs(wsz. Temp, sz. File. Content, bytes. Read); h. Edit = Get. Dlg. Item(h. Dlg, IDC_EDIT); //set the content of edit control. Set. Window. Text(h.
Edit, wsz. Temp); free(wsz. Temp); } //free resourcesfree(sz. File. Content); Close. Handle(h. File); } return TRUE; }The APIs and the OPENFILENAME structure are explained well in the MSDN documentation, so I am not going to repeat the same things here. Follow the links. The Do. Save. File() method in the application allows the user to save the contents of edit control into a file, here is the code: 1.
Get the full path to the file. Read the contents of edit control into a wide char buffer. Convert the wide char into char (multibyte string)4. Write the chars to the file. BOOL Do. Save. File(HWND h. Dlg){TCHAR sz. File[MAX_PATH] = TEXT("\0"); OPENFILENAME ofn; HANDLE h.
File = INVALID_HANDLE_VALUE; memset( & (ofn), 0, sizeof(ofn)); ofn. Struct. Size = sizeof(ofn); ofn. Owner = h. Dlg; ofn.
File = sz. File; ofn. Max. File = MAX_PATH; ofn. Filter = TEXT("Text (*.
Title = TEXT("Save File As"); ofn. Flags = OFN_HIDEREADONLY; ofn. Def. Ext = TEXT("txt"); //get the filename the user wants to save toif (Get.
Save. File. Name(& ofn)) {HWND h. Edit = NULL; DWORD dw. Text. Len = 0, bytes.
Written = 0; TCHAR *wsz. Edit. Text = NULL; char *sz. Edit. Text = NULL; //ofn. File contains the full path of the file, get a handle to ith.
File = Create. File(ofn. File, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if (h. File == INVALID_HANDLE_VALUE)return FALSE; h.
Edit = Get. Dlg. Item(h. Dlg, IDC_EDIT); //get the text length of the edit controls contentsdw. Text. Len = Get. Window. Text. Length(h. Edit); wsz. Edit. Text = (TCHAR*)malloc((dw.
Text. Len+1)*sizeof(TCHAR)); memset(wsz. Edit. Text, 0, (dw. Text. Len+1)*sizeof(TCHAR)); //read edit controls contents into buffer. Get. Window. Text(h. Edit, wsz. Edit. Text, dw. Text. Len+1); sz. Edit. Text = (char*)malloc(dw.
Text. Len+1); //convert the wide char read from edit control to charwcstombs(sz. Edit. Text, wsz. Edit. Text, dw. Text. Len); //save the contents into fileif (Write. File(h. File, sz. Edit. Text, dw. Text. Len, & bytes. Written, NULL)){} //free resourcesfree(wsz.
Edit. Text); free(sz. Edit. Text); Close. Handle(h. File); }return TRUE; }Here is a video demo of how things work.