這個C聲明代碼有什么問題？

Question

#include <stdlib.h>
#include <Windows.h>
#include <Tchar.h>

HANDLE wHnd;    // Handle to write to the console.
HANDLE rHnd;    // Handle to read from the console.

int _tmain(int argc, _TCHAR* argv[]) {

    // Set up the handles for reading/writing:
    wHnd = GetStdHandle(STD_OUTPUT_HANDLE);
    rHnd = GetStdHandle(STD_INPUT_HANDLE);

    // Change the window title:
    SetConsoleTitle(TEXT("Win32 Console Control Demo"));

    // Set up the required window size:
    SMALL_RECT windowSize = {0, 0, 79, 49};

    // Change the console window size:
    SetConsoleWindowInfo(wHnd, TRUE, &windowSize);

}

報告了一些像這樣的錯誤：

'SMALL_RECT' : illegal use of this type as an expression  
missing ';' before identifier 'windowSize'

Answer 1

您正在使用僅支持現在古老的C90標准的MS C編譯器。 必須在函數體的頂部聲明所有變量。

int _tmain(int argc, _TCHAR* argv[])
{    
    // Set up the required window size:
    SMALL_RECT windowSize = {0, 0, 79, 49};

    // Set up the handles for reading/writing:
    wHnd = GetStdHandle(STD_OUTPUT_HANDLE);
    rHnd = GetStdHandle(STD_INPUT_HANDLE);

    // Change the window title:
    SetConsoleTitle(TEXT("Win32 Console Control Demo"));

    // Change the console window size:
    SetConsoleWindowInfo(wHnd, TRUE, &windowSize);
}

痛苦，不是嗎？！