API in C# the func WRITE FILE
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hello, I have a pci card and i have the path of the port in a string value (//.////) in the write file func the value "hport" is in intptr; 1) I would happy if someone give an example of using in the fnction WriteFile 2) how I convert STRING TO INTPTR
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hello, I have a pci card and i have the path of the port in a string value (//.////) in the write file func the value "hport" is in intptr; 1) I would happy if someone give an example of using in the fnction WriteFile 2) how I convert STRING TO INTPTR
Hi, this is an example that writes a text string to a pipe using WriteFile. For P/Invoke you can have several prototypes with different sets of arguments; there is no need to convert to IntPtr yourself. BTW if you provide a string or StringBuilder it will convert Unicode to 8-bit ASCII by default.
private void SendString(StringBuilder sb) {
IntPtr pipe2=CreateFile(pipeName, GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
Thread.Sleep(200);
int count;
bool OK=WriteFile(pipe2, sb, sb.Length, out count, 0);
if (!OK) ... report error
ClosePipe(pipe2);
}// Writes data to a file at the position specified by the file pointer.
[DllImport("kernel32.dll", SetLastError=true)]
public static extern bool WriteFile(
IntPtr hHandle, // handle to file
StringBuilder lpBuffer, // data buffer
int nNumberOfBytesToWrite, // number of bytes to write
out int lpNumberOfBytesWritten, // number of bytes written
uint lpOverlapped // overlapped buffer
);:)
Luc Pattyn [My Articles]