C语言调用WindowApi实现计算器
作者：互联网
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void OperationClear(char* );
void SetNumber(char*);
void SetOp(char*);
void SetDot(char);
void Round(char*);
LPCTSTR calcNumber(double,double,char);
char resultNumber[30];
HMENU hMenu[18];
HWND hFormula[2];
HINSTANCE hInst;
HFONT hFont;
double number1 ;
double number2 ;
char labelBuf[20];
char beforeOp;
char buf[20];
char oper[10] = {0};
int nBtnHeight = 200;
int WINAPI WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
PSTR szCmdLine,
int iCmdShow
){
static TCHAR szClassName[] = TEXT("计算器"); //窗口类名
HWND hwnd; //窗口句柄
MSG msg; //消息
WNDCLASS wndclass; //窗口类
static HWND hBtn[18];
HDC hdc;
int wmId, wmEvent;
PAINTSTRUCT ps;
/**********第①步：注册窗口类**********/
//为窗口类的各个字段赋值
wndclass.style = CS_HREDRAW | CS_VREDRAW; //窗口风格
wndclass.lpfnWndProc = WndProc; //窗口过程
wndclass.cbClsExtra = 0; //暂时不需要理解
wndclass.cbWndExtra = 0; //暂时不需要理解
wndclass.hInstance = hInstance; //当前窗口句柄
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION); //窗口图标
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW); //鼠标样式
wndclass.hbrBackground= (HBRUSH) GetStockObject (WHITE_BRUSH); //窗口背景画刷
wndclass.lpszMenuName = NULL ; //窗口菜单
wndclass.lpszClassName= szClassName; //窗口类名
//注册窗口
RegisterClass(&wndclass);
/*****第②步：创建窗口(并让窗口显示出来)*****/
hwnd = CreateWindow(
szClassName, //窗口类的名字
TEXT("Welcome"), //窗口标题（出现在标题栏）
WS_OVERLAPPEDWINDOW, //窗口风格
CW_USEDEFAULT, //初始化时x轴的位置
CW_USEDEFAULT, //初始化时y轴的位置
800, //窗口宽度
600, //窗口高度
NULL, //父窗口句柄
NULL, //窗口菜单句柄
hInstance, //当前窗口的句柄
NULL //不使用该值
);
hFont = CreateFont(
-15/*高度*/, -7.5/*宽度*/, 0, 0, 400 /*一般这个值设为400*/,
FALSE/*不带斜体*/, FALSE/*不带下划线*/, FALSE/*不带删除线*/,
DEFAULT_CHARSET, //使用默认字符集
OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, //这行参数不用管
DEFAULT_QUALITY, //默认输出质量
FF_DONTCARE, //不指定字体族*/
TEXT("微软雅黑") //字体名
);
int t = 0;
for(int i=0;i<18;i++){
hMenu[i] = (i+10);
t++;
char string[6] = {0};
itoa(i,string,10);
int x = 30 + (150*t);
if((i+1)%3==0){
t = 0;
}
int y = nBtnHeight + (i/3)*50;
//创建按钮控件
if(i==10){
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("+/-"),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==11){
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("."),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==12){//+
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("+"),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==13){//-
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("-"),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==14){//*
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("X"),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==15){//*
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("/"),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==16){//*
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("C"),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else if(i==17){//*
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT("="),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}else{
hBtn[i] = CreateWindow(
TEXT("button"), //按钮控件的类名
TEXT(string),
WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/,
hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL
);
SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体
}
}
//显示窗口
ShowWindow (hwnd, iCmdShow);
//更新（绘制）窗口
UpdateWindow (hwnd);
/**********第③步：消息循环**********/
while( GetMessage(&msg, NULL, 0, 0) ){
TranslateMessage(&msg); //翻译消息
DispatchMessage (&msg); //分派消息
}
return msg.wParam;
}
/**********第④步：窗口过程**********/
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){
HDC hdc; //设备环境句柄
PAINTSTRUCT ps;
RECT rect;
static HFONT hFont2; //逻辑字体
static HFONT hFont3; //逻辑字体
int wmId, wmEvent;
switch (message){
case WM_CREATE:
hFont2 = CreateFont(-20/*高*/, -10/*宽*/, 0, 0, 400 /*一般这个值设为400*/,
FALSE/*斜体?*/, FALSE/*下划线?*/, FALSE/*删除线?*/,DEFAULT_CHARSET,
OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY,
FF_DONTCARE, TEXT("微软雅黑")
);
hFont3 = CreateFont(-30/*高*/, -20/*宽*/, 0, 0, 400 /*一般这个值设为400*/,
FALSE/*斜体?*/, FALSE/*下划线?*/, FALSE/*删除线?*/,DEFAULT_CHARSET,
OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY,
FF_DONTCARE, TEXT("微软雅黑")
);
/**创建算式显示框*/
hFormula[0] = CreateWindow(TEXT("static"), TEXT(""),
WS_CHILD | WS_VISIBLE /*边框| WS_BORDER*/ | ES_AUTOHSCROLL /*水平滚动*/ | ES_RIGHT /*文本右对齐*/,
180 /*x坐标*/, (nBtnHeight-100) /*y坐标*/, 450 /*宽度*/, 30 /*高度*/,
hwnd /*父窗口句柄*/, (HMENU)2 /*控件ID*/, hInst /*当前程序实例句柄*/, NULL
);
SendMessage(hFormula[0], WM_SETFONT, (WPARAM)hFont2, NULL);
/**创建结果显示框*/
hFormula[1] = CreateWindow(TEXT("static"), TEXT(""),
WS_CHILD | WS_VISIBLE /*边框| WS_BORDER */ | ES_AUTOHSCROLL /*水平滚动*/ | ES_RIGHT /*文本右对齐*/,
180 /*x坐标*/, (nBtnHeight-70) /*y坐标*/, 450 /*宽度*/, 70 /*高度*/,
hwnd /*父窗口句柄*/, (HMENU)3 /*控件ID*/, hInst /*当前程序实例句柄*/, NULL
);
SendMessage(hFormula[1], WM_SETFONT, (WPARAM)hFont3, NULL);
break;
//窗口绘制消息
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
EndPaint (hwnd, &ps) ;
break;
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
char btnText[2] = {0};
switch (wmId){
case 10: //按下按钮0
itoa(0,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 11: //按下按钮1
itoa(1,btnText,10);
SetNumber(btnText);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
break;
case 12: //按下按钮2
itoa(2,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 13: //按下按钮3
itoa(3,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 14: //按下按钮4
itoa(4,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 15: //按下按钮5
itoa(5,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 16: //按下按钮6
itoa(6,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 17: //按下按钮7
itoa(7,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 18: //按下按钮8
itoa(8,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 19: //按下按钮9
itoa(9,btnText,10);
//MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK);
SetNumber(btnText);
break;
case 20: //按下按钮+/-
MessageBox(NULL, TEXT("+/-"), TEXT("提示"), MB_OK);
break;
case 21: //按下按钮
SetDot('.');
//MessageBox(NULL, TEXT("."), TEXT("提示"), MB_OK);
break;
case 22: //按下按钮 +
oper[0] = '+';
SetOp(&oper);
break;
case 23: //按下按钮 -
oper[0] = '-';
SetOp(&oper);
break;
case 24: //按下按钮 X
oper[0] = 'x';
SetOp(&oper);
break;
case 25: //按下按钮 /
oper[0] = '/';
SetOp(&oper);
break;
case 26: //按下按钮 C
oper[0] = 'C';
OperationClear(&oper);
break;
case 27: //按下按钮 =
oper[0] = '=';
SetOp(&oper);
break;
default:
//不处理的消息一定要交给 DefWindowProc 处理。
return DefWindowProc(hwnd, message, wParam, lParam);
}
break;
//窗口销毁消息
case WM_DESTROY:
DeleteObject(hFont);
PostQuitMessage(0) ;
return 0 ;
}
return DefWindowProc(hwnd, message, wParam, lParam) ;
}
void OperationClear(char* op ){
if(op[0] == 'C'){
//MessageBox(NULL, TEXT(op), TEXT("提示"), MB_OK);
number1 = 0.0d;
number2 = 0.0d;
char result[2] = {0};
result[0] = ' ';
SetWindowText(hFormula[0],(LPCTSTR)result);
SetWindowText(hFormula[1],(LPCTSTR)result);
memset(buf,0,19);
memset(labelBuf,0,19);
memset(resultNumber,0,sizeof(resultNumber));
}
}
void SetDot(char dot){
int len = strlen(&buf);
if(len>0){
char c = buf[len-1];
if(c == '.'){
return ;
}
}
char* p = strchr(&buf,'.');
if(p!=NULL){
return ;
}
double bufNum = atof(&buf);
if(bufNum > 9999999999.9d){
return ;
}
strncat(&buf,&dot,1);
strncat(&labelBuf,&dot,1);
SetWindowText(hFormula[0],(LPCTSTR)labelBuf);
}
void SetNumber(char* num){ //10000000000
double bufNum = atof(&buf);
if(bufNum > 9999999999.9d){
return ;
}
strncat(&buf,num,1);
strncat(&labelBuf,num,1);
SetWindowText(hFormula[0],(LPCTSTR)labelBuf);
}
void SetOp(char* op){
int len = strlen(&labelBuf);
if(len==0){
return ;
}
if(len>0){
char c = labelBuf[len-1];
if(c == '+' || c=='-' || c=='x' || c=='/' || c == '='){
return ;
}
}
if(op[0] == '+' || op[0]=='-' || op[0]=='x' || op[0]=='/' ){
number1 = atof(&buf);
beforeOp = op[0];
memset(buf,0,sizeof(buf));
}
if(op[0] == '='){
number2 = atof(&buf);
LPCTSTR ret = calcNumber(number1,number2,beforeOp);
SetWindowText(hFormula[1],ret);
memset(resultNumber,0,sizeof(resultNumber));
}
strncat(&labelBuf,op,1);
SetWindowText(hFormula[0],(LPCTSTR)labelBuf);
if(op[0] == '='){
number1 = 0.0d;
number2 = 0.0d;
memset(buf,0,sizeof(buf));
memset(labelBuf,0,sizeof(labelBuf));
SetWindowText(hFormula[0],(LPCTSTR)labelBuf);
}
// char lenStr[5] = {0};
//itoa(len,lenStr,10);
//MessageBox(NULL, TEXT(lenStr), TEXT("提示"), MB_OK);
}
LPCTSTR calcNumber(double n1,double n2,char op){
//MessageBox(NULL, TEXT("2222"), TEXT("提示"), MB_OK);
if(op == '+'){
double n = n1 + n2;
memset(resultNumber,0,sizeof(resultNumber));
snprintf(resultNumber,11,"%.12f",n);
Round(resultNumber) ;
return (LPCTSTR)resultNumber;
}
if(op == '-'){
double n = n1 - n2;
memset(resultNumber,0,sizeof(resultNumber));
snprintf(resultNumber,11,"%.12f",n);
Round(resultNumber) ;
return (LPCTSTR)resultNumber;
}
if(op == 'x'){
double n = n1 * n2;
memset(resultNumber,0,sizeof(resultNumber));
snprintf(resultNumber,11,"%.12f",n);
Round(resultNumber) ;
return (LPCTSTR)resultNumber;
}
if(op == '/'){
double n;
if(n2==0){
n = 0;
}else{
n = n1 / n2;
}
memset(resultNumber,0,sizeof(resultNumber));
snprintf(resultNumber,11,"%.12f",n);
Round(resultNumber) ;
return (LPCTSTR)resultNumber;
}
}
void Round(char* resultStr){
int length = strlen(resultStr);
int m = length -1;
int k = 0;
do{
if(resultStr[m]=='.'){
k = m;
break;
}
if(resultStr[m]!='0'){
break;
}
if(resultStr[m]=='0'){
resultStr[m] = '\0';
}
m--;
}while(m>0);
if(k == strlen(resultStr)-1){
resultStr[k] = '\0';
}
}
编译环境CodeBlocks ,windows10.
效果如下：
标签：char,窗口,C语言,resultNumber,wndclass,WindowApi,计算器,buf,op 来源： https://www.cnblogs.com/javatiandi/p/14968605.html