创建，打开，写入文件API代码示例

 1 #include <Windows.h>
 2 #include <stdio.h>
 3 
 4 DWORD ReadFileContent(LPSTR szFilePath)
 5 {
 6     HANDLE hFileRead;
 7     LARGE_INTEGER liFileSize;
 8     DWORD dwReadedSize;
 9     LONGLONG liTotalRead =0;
10     BYTE lpFileDataBuffer[32];
11 
12     hFileRead = CreateFile(szFilePath,
13         GENERIC_READ,
14         FILE_SHARE_READ,
15         NULL,
16         OPEN_EXISTING,
17         FILE_ATTRIBUTE_NORMAL,
18         NULL);
19 
20     if(hFileRead == INVALID_HANDLE_VALUE)
21     {
22         printf("Open file failed:%d\n",GetLastError());
23     }
24     if(!GetFileSizeEx(hFileRead,&liFileSize))
25     {
26         printf("Get file size failed: %d\n",GetLastError());
27     }
28     else
29     {
30         printf("File size is:%d\n",liFileSize.QuadPart);
31     }
32 
33     while(TRUE)
34     {
35         DWORD i;
36         if(!ReadFile(hFileRead,
37             lpFileDataBuffer,
38             32,
39             &dwReadedSize,
40             NULL))
41         {
42             printf("Read file error:%d\n",GetLastError());
43             break;
44         }
45         printf("Readed %d byte,file content is: ",dwReadedSize);
46         for(i = 0; i < dwReadedSize; i++)
47         {
48             printf("0x%x ",lpFileDataBuffer[i]);
49         }
50         printf("\n");
51         liTotalRead += dwReadedSize;
52         if(liTotalRead == liFileSize.QuadPart)
53         {
54             printf("Read file end!\n");
55             break;
56         }
57     }
58     CloseHandle(hFileRead);
59     return 0;
60 }
61 
62 DWORD SaveDataToFile(
63     LPSTR szFilePath,
64     LPVOID lpData,
65     DWORD dwDataSize)
66 {
67     HANDLE hFileWrite;
68     DWORD dwWritedDateSize;
69     hFileWrite = CreateFile(szFilePath,
70         GENERIC_WRITE,
71         0,
72         NULL,
73         OPEN_ALWAYS,
74         FILE_ATTRIBUTE_NORMAL,
75         NULL);
76 
77 
78     if(hFileWrite == INVALID_HANDLE_VALUE)
79     {
80         printf("Open file failed: %d\n",GetLastError());
81     }
82     SetFilePointer(hFileWrite,0,0,FILE_END);
83     if(!WriteFile(hFileWrite, lpData, dwDataSize, &dwWritedDateSize, NULL))
84         printf("Write file failed: %d\n",GetLastError());
85     else
86         printf("Write file sucess!,write %d bytes.\n",dwWritedDateSize);
87     CloseHandle(hFileWrite);
88     return 0;
89 }
90 
91 int main(void)
92 {
93     LPSTR szFileData = "this is my first sample!";
94     SaveDataToFile("D:\\show.txt",szFileData,lstrlen(szFileData));
95     ReadFileContent("D:\\show.txt");
96     return 0;
97 }