关于取颜色的rgb始终为负数
#include <stdio.h>
#include <windows.h>
int main()
{
COLORREF my;
HDC hdc;
HWND hwnd=FindWindow(NULL,"空当接龙");
printf("%x\n",hwnd);
hdc=GetWindowDC(hwnd);
printf("%x\n",hdc);
printf("%x\n",GetPixel(hdc,100,100));//335.160
ReleaseDC(hwnd,hdc);
getchar();
return 0;
}
输出的值是ffffffffff