使用 FormatMessage 将 GetLastError 返回值转换为文字

源码如下：

 1 #include <stdio.h>
 2 //#include <tchar.h>
 3 #include <Windows.h>
 4 
 5 
 6 
 7 void fmtMsg()
 8 {
 9     LPTSTR  errorText = NULL;
10 
11     FormatMessage(
12         // use system message tables to retrieve error text
13         FORMAT_MESSAGE_FROM_SYSTEM
14         // allocate buffer on local heap for error text
15         | FORMAT_MESSAGE_ALLOCATE_BUFFER
16         // Important! will fail otherwise, since we're not 
17         // (and CANNOT) pass insertion parameters
18         | FORMAT_MESSAGE_IGNORE_INSERTS,
19         NULL,    // unused with FORMAT_MESSAGE_FROM_SYSTEM
20         GetLastError(),
21         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
22         (LPTSTR)&errorText,        // output
23         0,                // minimum size for output buffer
24         NULL);
25 
26     if (errorText != NULL)
27     {
28         printf_s("%s", errorText);
29 
30         // release memory allocated by FormatMessage()
31         LocalFree(errorText);
32         errorText = NULL;
33     }
34 }
35 
36 int main()
37 {
38     fmtMsg();
39 
40     return 0;
41 }

出处：https://stackoverflow.com/questions/455434/how-should-i-use-formatmessage-properly-in-c