大家好，我在学习windows编程，多多指教
#include<windows.h>
LRESULT CALLBACK MainWndProc(HWND,UINT,WPARAM,LPARAM);
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
char szClassName[]="MainWClass";
WNDCLASSEX wndclass;
// 用描述主窗口的参数填充WNDCLASSEX结构
w...