Win32编程之异步完成IO(十)

#include <Windows.h>
#include <stdio.h>

int main() {
	HANDLE hFile = CreateFile(TEXT("test.txt"), GENERIC_WRITE | GENERIC_READ, 0, 
　　 NULL, OPEN_ALWAYS, FILE_FLAG_SEQUENTIAL_SCAN | FILE_FLAG_OVERLAPPED, NULL);
	if (hFile == INVALID_HANDLE_VALUE) {
		printf("无法打开文件。错误码:%d\n", GetLastError());
		return 0;
	}

	OVERLAPPED ol1 = { 0 };
	char buffer[] = "Hello World";
	DWORD writeCount = 0;
	BOOL ret = WriteFile(hFile, buffer, strlen(buffer), &writeCount, &ol1);
	if (!ret) {
		CloseHandle(hFile);
		printf("文件写入失败!\n");
		return 0;
	}

	CloseHandle(hFile);

	return 1;
}

#include <Windows.h>
#include <stdio.h>

int main() {
	HANDLE hFile = CreateFile(TEXT("test.txt"), GENERIC_WRITE | GENERIC_READ, 0, NULL, OPEN_EXISTING, 
　　 FILE_FLAG_SEQUENTIAL_SCAN | FILE_FLAG_OVERLAPPED, NULL);
	if (hFile == INVALID_HANDLE_VALUE) {
		printf("无法打开文件。错误码:%d\n", GetLastError());
		return 0;
	}

	OVERLAPPED ol2 = { 0 };
	char readBuffer[255] = { 0 };
	DWORD readCount = 0;
	ret = ReadFile(hFile, readBuffer, 255, &readCount, &ol2);
	if (!ret) {
		CloseHandle(hFile);
		printf("文件读取失败!\n");
		return 0;
	}
	printf("readBuffer:%s\n", readBuffer);

	CloseHandle(hFile);

	return 1;
}