20分请教TC20下面读写文件时出现的开启文件失败问题，大家有无类似经历？

操作文件时出现奇怪问题，大家有无类似经历？

用的是TC2.0,程序反复打开文件，第一轮读写没有问题，第二轮写没有问题，读的时候不能打开文件，分析半天都找不到原因。大虾们帮忙看看。


#include <conio.h>
#include <stdio.h>

#define File_IO \"D:\\\\tc20\\\\work\\\\output\\\\SysSet.txt\"
char Result = 0;
char *Str = \"Hello!\";

void SaveSub(void)
{
FILE *FilePtr = NULL;
FilePtr = fopen(File_IO,\"r+\");
if(FilePtr==NULL)
{
printf(\"Creat file Error!\\n\");
exit(0);
}
else
{
Result = fseek(FilePtr,0,SEEK_SET);
Result = fprintf(FilePtr,\"%s\\n\",Str);
Result = printf(\"Save: %s\\n\",Str);
}
Result = fclose(FilePtr);
}

void ReadSetting(void)
{
FILE *FilePtr = NULL;
char *ReadStr=\"\";

FilePtr = NULL;
FilePtr =fopen(File_IO,\"r\");  /* 第二次执行到这里时出错，不能打开文件 */
if(FilePtr == NULL)
{
printf(\"can not open file ABC.txt for reading\\n\");

exit(0);
}
else
{
Result = fseek(FilePtr,0,SEEK_SET);
Result = fscanf(FilePtr,\"%s\\n\",ReadStr);
printf(\"\\tRead: %s\",ReadStr);
}
Result = fclose(FilePtr);
if(Result != 0)
{ printf(\"close file Error!\\n\"); };
}

void main(void)
{
SaveSub();
ReadSetting();
SaveSub();
ReadSetting();
SaveSub();
ReadSetting();
SaveSub();
ReadSetting();
SaveSub();
while(!kbhit());
}

[编辑 -  6/17/03 by  study51]

[编辑 -  6/17/03 by  study51]

char *ReadStr=\"\";==> char ReadStr[100]
ReadStr没分配内存!!

果然，谢谢