void demoTask(void)
{
    T_Message    RecvMsg;
    OSD_RECT    TextRect;
    INT8S       HintStr[300];
    int bmp_count=0;/////////////////////这里设置的一个变量

    TextRect.x = 300;
    TextRect.y = 540;
    TextRect.width = 300;
    TextRect.height = 30;
    while(1)
    {
        DTOS_DRV_ReceiveMessage( Test_queueID, &RecvMsg);
        DrawRoundRectangle(TextRect, 0x0060a0d0, 0, GRADE_NONE,  Small_Round);

        switch(RecvMsg.param0)
        {
            case MSG_PGDOWN:
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[PgDn]键", ALIGNED_CENTER);
                break;
            case MSG_PGUP:            
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[PgUp]键", ALIGNED_CENTER);
                break;
            case MSG_KeyUP:
                bmp_count--；/////////////这里用到这个变量
                showbmp(&bmp_count);
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[↑]键", ALIGNED_CENTER);
                break;
            case MSG_KeyDOWN:
                bmp_count++;
                showbmp(&bmp_count);
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[↓]键", ALIGNED_CENTER);
                break;
            case MSG_KeyLEFT:
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[←]键", ALIGNED_CENTER);
                break;
            case MSG_KeyRIGHT:
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[→]键", ALIGNED_CENTER);
                break;
            case MSG_KeySELECT:
                GUIDrawAlignedText(0xff000000, 24, TextRect, "您按下了[回车]键", ALIGNED_CENTER);
                break;
            default:
                sprintf(HintStr, "您按的键盘值为[0x%x]！", RecvMsg.param0);
                GUIDrawAlignedText(0xff000000, 24, TextRect, HintStr, ALIGNED_CENTER);
                break;   
        }
    }


void showbmp(*which)
{
    FILE *fp;
    INT8U len;
    INT8S* filename;
    len=strlen(File[*which]);
    filename=(char*)malloc(len+1);
    strcpy(filename,File[*which]);
    if((fp=(FILE*)fopen(filename,"rb")==NULL)////////////////////这里老是有错。。
    {
        printf("\ncan not open!\n");
        exit(1);
    }
    if((fgetc(fp)!=0x42)||fgetc(fp)!=0x4d)
    {
        exit(1);
    }

请问这里究竟应该怎么做？
十分紧急，如果需要源程序的话请留言。万分感谢
本人新手，技术略搓