LRESULT CALLBACK WndProc(HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam
)
{
//定义字符串
//char *msgCaption="收到消息";
//char *msgLBTN="鼠标右键按下，收到WM_LBUTTONDOWN消息";

char *msgCaption="收到消息";
char *str;

HDC hDC; //定义指向设备环境的句柄
HBRUSH hBrush; //定义指向画刷的句柄
HPEN hPen; //定义指向画笔的句柄
PAINTSTRUCT PtStr; //定义指向绘图信息的结构变量
switch(message)
{
case WM_CHAR: //接收从键盘输入的字符
我想在这个地方取出wParam的值放在str上怎么做
break;

[此贴子已经被作者于2006-10-20 14:58:27编辑过]

str = (TCHAR) wParam;
输入进去会有这下面这种错误：

E:\VC\pro46\WinAPI.cpp(94) : error C2440: '=' : cannot convert from 'char' to 'char *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast

char str;
//char *msgLBTN="鼠标右键按下，收到WM_LBUTTONDOWN消息";
HDC hDC; //定义指向设备环境的句柄
HPEN hPen; //定义指向画笔的句柄
PAINTSTRUCT PtStr; //定义指向绘图信息的结构变量
switch(message)
{
case WM_CHAR: //接收从键盘输入的字符
str=(TCHAR)wParam;
MessageBox(GetFocus(),*str,msgCaption,MB_OK|MB_ICONINFORMATION);

出现以下错误
E:\VC\pro46\WinAPI.cpp(85) : error C2100: illegal indirection
E:\VC\pro46\WinAPI.cpp(85) : error C2664: 'MessageBoxA' : cannot convert parameter 2 from 'char' to 'const char *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

str=(char)LOWORD(wParam);
sprintf(txt,"%c",str);

为何不能直接用str，而要先把str放入txt中？