关于emWin下png图片显示运行出错的问题

凡吹羽_xXQqf · 发表于 2019-4-17 11:40:09

本帖最后由凡吹羽_xXQqf 于 2019-4-17 11:44 编辑

我需要在屏幕创建了一个窗口，在窗口下创建TEXT控件显示一个动态的数字，为了避免刷新是闪烁，在主函数里添加代码：

WM_SetCreateFlags(WM_CF_MEMDEV);

但是添加了之后背景图片却显示不了(不添加上面函数图片显示正常)，运行报错提示：
GUI_PNG.c:Error in _png_cexcept_errot().
详细代码如下：

#include "DIALOG.h"
#include "backgrond.h"

#define ID_WINDOW_0       (GUI_ID_USER + 0x00)
#define ID_IMAGE_0       (GUI_ID_USER + 0x01)
#define ID_TEXT_0       (GUI_ID_USER + 0x02)

#define ID_IMAGE_0_IMAGE_0    0x00

#define RECOMMENDED_MEMORY (1024L * 160)

static const GUI_WIDGET_CREATE_INFO _aDialogCreate[] = {
  { WINDOW_CreateIndirect, "Window", ID_WINDOW_0, 0, 0, 800, 480, 0, 0x0, 0 },
  { IMAGE_CreateIndirect, "Image_png", ID_IMAGE_0, 0, 0, 800, 480, 0, 0, 0 },
{ TEXT_CreateIndirect, "Text1", ID_TEXT_0, 30, 198, 100, 41, 0, 0x64, 0 },
};

static const void * _GetImageById(U32 Id, U32 * pSize) {
  switch (Id) {
  case ID_IMAGE_0_IMAGE_0:
*pSize = sizeof(_acBackgrond);
return (const void *)_acBackgrond;
  }
  return NULL;
}

static void _cbDialog(WM_MESSAGE * pMsg) {
  const void * pData;
  WM_HWIN    hItem;
  U32       FileSize;

  switch (pMsg->MsgId) {
  case WM_INIT_DIALOG:

   WINDOW_SetBkColor(pMsg->hWin, GUI_GRAY);
// Initialization of 'Image_png'
hItem = WM_GetDialogItem(pMsg->hWin, ID_IMAGE_0);
pData = _GetImageById(ID_IMAGE_0_IMAGE_0, &FileSize);
IMAGE_SetPNG(hItem, pData, FileSize);
// Initialization of 'Text1'
hItem = WM_GetDialogItem(pMsg->hWin, ID_TEXT_0);
TEXT_SetFont(hItem, GUI_FONT_D32);
TEXT_SetTextColor(hItem, GUI_MAKE_COLOR(0x00FFFFFF));
TEXT_SetText(hItem, "00");
break;
  default:
WM_DefaultProc(pMsg);
break;
  }
}
// USER START (Optionally insert additional public code)
void MainTask(void) {
WM_HWIN  hWin;
WM_HWIN hText;
char acText[3] = { 0 };
int value=0;
WM_SetCreateFlags(WM_CF_MEMDEV);

GUI_Init();
if (GUI_ALLOC_GetNumFreeBytes() < RECOMMENDED_MEMORY) {
      GUI_ErrorOut("Not enough memory available.");
      return;
}
hWin = GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, WM_HBKWIN, 0, 0);
while (1) {
      GUI_Delay(10);
      sprintf(acText, "%2d", value++);

      hText = WM_GetDialogItem(hWin, ID_TEXT_0);
      TEXT_SetText(hText, acText);
}
}
// USER END

添加

WM_SetCreateFlags(WM_CF_MEMDEV);

错误提示：

不添加下行代码会出现闪烁，图片中看不出来

WM_SetCreateFlags(WM_CF_MEMDEV);