有关指针的问题,很奇怪
一个很简单的程序,在两个程序中一个运行成功,一个运行失败
不知道是什么原因
运行失败的:
#include "stdafx.h"
void Test(char * lpchr);
VOID WriteTestFile(char * chstrs);
int main(int argc, char* argv[])
{
Test("hello");
cout<<"new Test:"<<"";
return 0;
}
void Test(char * pchars){
char pchs[]="1234";
char * pchtmp="";
cout<<"OldValue:"<<pchars<<endl;
strcpy(pchtmp,pchars);
//在这里出错,提示内存不能写入。
//是由于pchtmp指针指向的""是常量??,不知道是否是这个原因??
cout<<"COPY:"<<pchtmp<<endl;
::WriteTestFile(pchtmp);
}
VOID WriteTestFile(char * chstrs){
char *filepath="d:\\cyberip\\cydebugss.txt";
DWORD lWritten;
HANDLE hLogFile = CreateFile(filepath, GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, 0, NULL);
if (hLogFile != INVALID_HANDLE_VALUE) {
SetFilePointer(hLogFile, 0, 0, FILE_END);
WriteFile(hLogFile, chstrs, strlen(chstrs), &lWritten, NULL);
WriteFile(hLogFile, "\r\n", 2, &lWritten, NULL);
CloseHandle(hLogFile);
}
}