LISTVIEW Get All data to buffer and Set again

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    • LISTVIEW Get All data to buffer and Set again

      Dear,

      i have a listbox. so i want to save listbox datas to save file and restore again.
      When this code runs ,

      Source Code

      1. int numOfRead = LISTVIEW_GetUserData(hListview,fContect,memsize);
      2. PRINTF("numOfRead:%d.\n",numOfRead);

      it prints 0. i cant find get all data from listview. and restore it again. can you suggest any solition?

      my orginal source code is:

      C Source Code

      1. /*********************************************************************
      2. * SEGGER Microcontroller GmbH *
      3. * Solutions for real time microcontroller applications *
      4. **********************************************************************
      5. * *
      6. * (c) 1996 - 2022 SEGGER Microcontroller GmbH *
      7. * *
      8. * Internet: www.segger.com Support: support@segger.com *
      9. * *
      10. **********************************************************************
      12. ** emWin V6.24 - Graphical user interface for embedded applications **
      13. emWin is protected by international copyright laws. Knowledge of the
      14. source code may not be used to write a similar product. This file may
      15. only be used in accordance with a license and should not be re-
      16. distributed in any way. We appreciate your understanding and fairness.
      17. ----------------------------------------------------------------------
      18. File : LISTVIEW_Usage.c
      19. Purpose : Sample that demonstrates the usage of LISTVIEW widgets
      20. in emWin.
      21. Requirements: WindowManager - (x)
      22. MemoryDevices - ( )
      23. AntiAliasing - ( )
      24. VNC-Server - ( )
      25. PNG-Library - ( )
      26. TrueTypeFonts - ( )
      27. Wiki link : https://wiki.segger.com/LISTVIEW_-_Usage_(Sample)
      28. ---------------------------END-OF-HEADER------------------------------
      29. */
      30. #include "DIALOG.h"
      31. #include <stdio.h>
      32. #include <stdlib.h>
      34. /*********************************************************************
      35. *
      36. * Defines
      37. *
      38. **********************************************************************
      39. */
      40. #define ID_COLUMN_EMP_NO 0
      41. #define ID_COLUMN_LAST_NAME 1
      42. #define ID_COLUMN_FIRST_NAME 2
      43. #define ID_COLUMN_EXT 3
      44. #define ID_COLUMN_TITLE 4
      45. #define ID_COLUMN_EMAIL 5
      47. /*********************************************************************
      48. *
      49. * Static data
      50. *
      51. **********************************************************************
      52. */
      53. static const char * _acContent[][6] = {
      54. { "1002", "Murphy", "Diane", "x5800", "President", "dmurphy@classicmodelcars.com" },
      55. { "1056", "Patterson", "Mary", "x4611", "VP Sales", "mpatterso@classicmodelcars.com" },
      56. { "1076", "Firrelli", "Jeff", "x9273", "VP Marketing", "jfirrelli@classicmodelcars.com" },
      57. { "1088", "Patterson", "William", "x4871", "Sales Manager (APAC)", "wpatterson@classicmodelcars.com" },
      58. { "1102", "Bondur", "Gerard", "x5408", "Sale Manager (EMEA)", "gbondur@classicmodelcars.com" },
      59. { "1143", "Bow", "Anthony", "x5428", "Sales Manager (NA)", "abow@classicmodelcars.com" },
      60. { "1165", "Jennings", "Leslie", "x3291", "Sales Rep", "ljennings@classicmodelcars.com" },
      61. { "1166", "Thompson", "Leslie", "x4065", "Sales Rep", "lthompson@classicmodelcars.com" },
      62. { "1188", "Firrelli", "Julie", "x2173", "Sales Rep", "jfirrelli@classicmodelcars.com" },
      63. { "1216", "Patterson", "Steve", "x4334", "Sales Rep", "spatterson@classicmodelcars.com" },
      64. { "1286", "Tseng", "Foon Yue", "x2248", "Sales Rep", "ftseng@classicmodelcars.com" },
      65. };
      67. /*********************************************************************
      68. *
      69. * Static code
      70. *
      71. **********************************************************************
      72. */
      73. /*********************************************************************
      74. *
      75. * _cbBk
      76. */
      77. static void _cbBk(WM_MESSAGE * pMsg) {
      78. int Id, NCode;
      79. WM_HWIN hListview;
      80. int Sel;
      81. char acBuffer [128];
      82. char acFirstName[32];
      83. char acLastName [32];
      85. switch (pMsg->MsgId) {
      86. case WM_PAINT:
      87. GUI_SetBkColor(GUI_WHITE);
      88. GUI_Clear();
      89. GUI_SetColor(GUI_BLACK);
      90. //
      91. // Display selected item
      92. //
      93. hListview = WM_GetDialogItem(WM_HBKWIN, GUI_ID_LISTVIEW0);
      94. Sel = LISTVIEW_GetSel(hListview);
      95. if (Sel != -1) {
      96. sprintf(acBuffer, "Selected row: %d", Sel);
      97. GUI_DispStringAt(acBuffer, 10, 380);
      98. LISTVIEW_GetItemTextSorted(hListview, ID_COLUMN_FIRST_NAME, Sel, acFirstName, sizeof(acFirstName));
      99. LISTVIEW_GetItemTextSorted(hListview, ID_COLUMN_LAST_NAME, Sel, acLastName, sizeof(acLastName));
      100. sprintf(acBuffer, "Selected employee name: %s %s", acFirstName, acLastName);
      101. GUI_DispStringAt(acBuffer, 10, 400);
      102. // LISTVIEW_DeleteRow(hListview,Sel);
      103. LISTVIEW_SetTextAlign(hListview,LISTVIEW_GetSelCol(hListview),GUI_TA_HCENTER | GUI_TA_VCENTER);
      104. }
      105. //
      106. // No selection
      107. //
      108. else {
      109. sprintf(acBuffer, "Selected row: none.");
      110. GUI_DispStringAt(acBuffer, 10, 380);
      111. }
      112. break;
      113. case WM_NOTIFY_PARENT:
      114. Id = WM_GetId(pMsg->hWinSrc);
      115. NCode = pMsg->Data.v;
      116. switch (Id) {
      117. case GUI_ID_LISTVIEW0:
      118. switch (NCode) {
      119. case WM_NOTIFICATION_SEL_CHANGED:
      120. //
      121. // Display new selection in this window when LISTVIEW selection has changed.
      122. //
      123. WM_InvalidateWindow(pMsg->hWin);
      124. break;
      125. }
      126. break;
      127. }
      128. break;
      129. default:
      130. WM_DefaultProc(pMsg);
      131. }
      132. }
      134. /*********************************************************************
      135. *
      136. * _CompareExtension
      137. */
      138. static int _CompareExtension(const void * p0, const void * p1) {
      139. const char * ps[2];
      140. int v[2];
      141. int i;
      143. ps[0] = (const char *)p0 + 1; // Move pointer by 1 to ignore the 'x'
      144. ps[1] = (const char *)p1 + 1;
      145. //
      146. // Parse to int
      147. //
      148. for (i = 0; i < 2; i++) {
      149. v[i] = atoi(ps[i]);
      150. if (v[i] == 0) {
      151. return 0;
      152. }
      153. }
      154. //
      155. // Return comparison result
      156. //
      157. if (v[0] > v[1]) {
      158. return -1;
      159. } else if (v[0] < v[1]) {
      160. return 1;
      161. } else {
      162. return 0;
      163. }
      164. }
      166. /*********************************************************************
      167. *
      168. * Public code
      169. *
      170. **********************************************************************
      171. */
      172. /*********************************************************************
      173. *
      174. * MainTask
      175. */
      176. //omer^aygor^1231244
      177. //omer serfa^dogruer^123123123
      178. void MainTask(void) {
      179. LISTVIEW_Handle hListview;
      180. int i;
      182. //
      183. // Init GUI
      184. //
      185. GUI_Init();
      186. //
      187. // Enable multi-buffering
      188. //
      189. WM_MULTIBUF_Enable(1);
      190. //
      191. // Set callback to background window to receive LISTVIEW notifications
      192. //
      193. WM_SetCallback(WM_HBKWIN, _cbBk);
      194. //
      195. // Create listview widget
      196. //
      197. hListview = LISTVIEW_CreateEx(10, 10, 400, 300, WM_HBKWIN, WM_CF_SHOW, 0, GUI_ID_LISTVIEW0);
      198. //
      199. // Add columns to listview
      200. //
      201. LISTVIEW_SetFont(hListview,&GUI_Font16B_1);
      202. LISTVIEW_SetHeaderHeight(hListview,40);
      203. LISTVIEW_AddColumn(hListview, 45, "Emp. Nr.", GUI_TA_LEFT);
      204. LISTVIEW_AddColumn(hListview, 60, "Last Name", GUI_TA_LEFT);
      205. LISTVIEW_AddColumn(hListview, 60, "First Name", GUI_TA_LEFT);
      206. LISTVIEW_AddColumn(hListview, 40, "Ext.", GUI_TA_LEFT);
      207. LISTVIEW_AddColumn(hListview, 110, "Title", GUI_TA_LEFT);
      208. LISTVIEW_AddColumn(hListview, 180, "Email", GUI_TA_LEFT);
      209. //
      210. // Add rows to listview
      211. //
      212. for (i = 0; i < GUI_COUNTOF(_acContent); i++) {
      213. LISTVIEW_AddRow(hListview, _acContent[i]);
      214. }
      215. //
      216. // Set compare functions
      217. //
      218. // LISTVIEW_SetCompareFunc(hListview, 0, LISTVIEW_CompareDec);
      219. // LISTVIEW_SetCompareFunc(hListview, 1, LISTVIEW_CompareText);
      220. // LISTVIEW_SetCompareFunc(hListview, 2, LISTVIEW_CompareText);
      221. // LISTVIEW_SetCompareFunc(hListview, 3, _CompareExtension);
      222. // LISTVIEW_SetCompareFunc(hListview, 4, LISTVIEW_CompareText);
      223. // LISTVIEW_SetCompareFunc(hListview, 5, LISTVIEW_CompareText);
      224. //
      225. // Enable sorting
      226. //
      227. LISTVIEW_EnableSort(hListview);
      228. LISTVIEW_SetGridVis(hListview,1);
      229. //
      230. // Enable motion scrolling
      231. //
      232. LISTVIEW_EnableMotion(hListview, LISTVIEW_CF_AUTOSCROLLBAR_H | LISTVIEW_CF_AUTOSCROLLBAR_V);
      234. HEADER_Handle hHeader = LISTVIEW_GetHeader(hListview);
      235. HEADER_SetTextColor(hHeader, GUI_RED);
      236. HEADER_SetFont(hHeader,&GUI_Font16B_1);
      238. int memsize = 1024 * 1024;
      239. char *fContect = malloc(memsize * (sizeof(char)));
      240. if( fContect == NULL )
      241. {
      242. PRINTF("Malloc Error!\n");
      243. }
      244. while (1){
      245. GUI_Delay(100);
      246. sysDelay(1000);
      247. int numOfRead = LISTVIEW_GetUserData(hListview,fContect,memsize);
      248. PRINTF("numOfRead:%d.\n",numOfRead);
      249. }
      250. }
      252. /*************************** End of file ****************************/
      Display All

    • Hi,

      The user data set to windows or widgets refers to additional data being allocated when the window/widget is created. This data is part of the memory block associated with the window and can be accessed with <WIDGET>_GetUserData(). You can find a detailed tutorial about this topic in our wiki.

      The strings added to a LISTVIEW are not part of the user data. And since you did not add user data to the widget with LISTVIEW_SetUserData() calling ..._GetUserData() returns 0 bytes.

      Unfortunately the LISTVIEW does not offer a CSV import/export feature. But we will discuss this internally, as it can be very useful indeed.

      BTW: In line 232 you pass the LISTVIEW_CF_AUTOSCROLLBAR_... flags to LISTVIEW_EnableMotion(). This won't have any effect, you have to use the LISTVIEW_CF_MOTION_... flags instead.

      Best regards,
      Florian
      Please read the forum rules before posting.

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