illegal use of this type as an expression

学习MCI时看别人样例手敲代码出现的一个很经典的错误。

在C语言中定义的变量没有放在函数的开头。

#include <string.h>
#include <windows.h>
#include <Digitalv.h>
#include <mmsystem.h>
#pragma comment(lib, "winmm.lib")

int main()
{
	char buf[128];
	MCI_OPEN_PARMS mciOpen;
	MCIERROR mciError;
	UINT DeviceID;
	MCI_PLAY_PARMS mciPlay;
	mciOpen.lpstrDeviceType = L"mpegvideo";
	mciOpen.lpstrElementName = L"year.mp3";
	mciError = mciSendCommand(0, MCI_OPEN,MCI_OPEN_TYPE | MCI_OPEN_ELEMENT, (DWORD)&mciOpen);
	if(mciError)
	{
		mciGetErrorString(mciError, (LPWSTR)buf, 128);
		MessageBox(NULL, TEXT("send MCI_OPEN command failed"), TEXT("ERROR"), 0);
		return;
	}
	DeviceID = mciOpen.wDeviceID;
	mciError = mciSendCommand(DeviceID, MCI_PLAY, MCI_WAIT | MCI_DGV_PLAY_REPEAT, (DWORD)&mciPlay);
	if(mciError)
	{
		mciGetErrorString(mciError, (LPWSTR)buf, 128);
		MessageBox(NULL, TEXT("send MCI_PLAY command failed"), TEXT("ERROR"), 0);
		return;
	}
	return 0;
}