WriteFile Function Error?

[andy320]

Hi, I'm not quite shure if I'm doing something wrong or if the function "WriteFile" has a problem. The problem appears if I use WriteFile twice after eachother with the same String-Variable. In the first WriteFile-Call the String-Variable contains for example 1200 bytes and then I overwrite the string with 1000 bytes and call the WriteFile-Function again. In this case, the File written is bigger than 1000 bytes, it also contains the 200 bytes that were in the string before. There is a c-File with example code attached that produces the failure.

[Shiner]

Off the top of my head...

When you read in the 1200 chars and then over wrote the string with 1000 chars, did you make the 1000th (or 1001st) a NULL.
When you calculate the stringlength of your string variable, it uses the first found NULL to determine end of string.

Change the char you overwrite the string with to write a NULL and see what happens.

Chris

[andy320]

I already tried to explicit write a NULL at the end of the string (1000th character) but it doesn't help! The only thing that helps is to set each of the 1200 characters to NULL before overwriting...