C++ MFC常用API

判断编辑框字符串是否为空

AfxMessageBox("查找的字符串为空！");

SHOW & HIDE

GetDlgItem(IDC_EDIT1)->ShowWindow(SW_HIDE);

设置程序图标

m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

移动控件/窗口

//窗口
MoveWindow(0,0,640,480);
CenterWindow(); 
//移动控件
GetDlgItem(IDOK)->MoveWindow(640-60,0,55,18,TRUE);

获取文件路径

char    appdir[256];
GetCurrentDirectory(256,appdir);
    dir=appdir;
    if(dir.Right(8)=="运行程序")
            dir="图片/";
    else    
        //上一个文件夹
        dir="../运行程序/图片/";

定时器

//申明
BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
    ON_WM_TIMER()
END_MESSAGE_MAP()
afx_msg void OnTimer(UINT nIDEvent);
//调用 会被无限调用
void CMyDlg::OnTimer(UINT nIDEvent)
{   CClientDC dc(this);
    if(getpic("人",p)==FALSE)
            {AfxMessageBox(cc+"没找到!"); 
    //选择随机图片
    SelectObject(MemDC,bit);
    //画出来
    BitBlt(dc.m_hDC,200,160,w,h,MemDC,0,0,SRCCOPY); 
    p++;
    if(p>m1) p=m0;
    //nIDEvent 是个唯一标示
    CDialog::OnTimer(nIDEvent);
}
//调用
SetTimer(1,150,NULL);//1是标志，150是毫秒

图片透明

CClientDC dc(this);
int x = 200, y = 200;
if (getpic("人", p) == FALSE)
{
    AfxMessageBox(cc + "没找到!");return;
}
SelectObject(MemDC, bit);
TransparentBlt2(dc.m_hDC, x, y, w, h, MemDC, 0, 0, w, h, RGB(255, 255, 255));


void TransparentBlt2( HDC hdc0, 
                    int nX0,int nY0,
                    int nW0,int nH0,
                    HDC hdc1,
                    int nX1,int nY1,
                    int nW1,int nH1,
                    UINT Tcol
                    )
{   HBITMAP hBMP   =CreateCompatibleBitmap(hdc0,nW0, nH0);
    HBITMAP mBMP   =CreateBitmap(nW0,nH0,1,1,NULL); 
    HDC     hDC    =CreateCompatibleDC(hdc0);
    HDC     mDC    =CreateCompatibleDC(hdc0);
    HBITMAP oldBMP =(HBITMAP)SelectObject(hDC, hBMP);
    HBITMAP oldmBMP=(HBITMAP)SelectObject(mDC, mBMP);
    if (nW0==nW1&&nH0==nH1)
        BitBlt(hDC,0,0,nW0,nH0,hdc1,nX1,nY1,SRCCOPY);
    else
        StretchBlt(hDC,0,0,nW0,nH0,hdc1,nX1,nY1,nW1,nH1,SRCCOPY);

    //SetBkColor(hDC, Tcol);
    BitBlt(mDC,0,0,nW0,nH0,hDC,0,0,SRCCOPY);
    SetBkColor(hDC, RGB(0,0,0));

    SetTextColor(hDC, RGB(255,255,255));
    BitBlt(hDC,0,0,nW0,nH0,mDC,0,0,SRCAND);
    SetBkColor(hdc0,RGB(255,255,255));
    SetTextColor(hdc0,RGB(0,0,0));

    BitBlt(hdc0,nX0,nY0,nW0,nH0,mDC,0,0,SRCAND);
    BitBlt(hdc0,nX0,nY0,nW0,nH0,hDC,0,0,SRCPAINT);

    SelectObject(hDC, oldBMP);              
    DeleteDC(hDC);
    SelectObject(mDC, oldmBMP);
    DeleteDC(mDC);
    DeleteObject(hBMP);
    DeleteObject(mBMP);
}

Http（post/get）请求(https://blog.csdn.net/dragoo1/article/details/7800249)

因为需要全局引用 所以最好在stdafx.h申明

#include <stdio.h>
#include <string>
#include "Wininet.h"
#pragma comment(lib,"Wininet.lib")
std::string HttpRequest(CString   lpHostName, short sPort, CString lpUrl, CString lpMethod, char * lpPostData, int nPostDataLen);

stdafx.cpp实现

//模拟浏览器发送HTTP请求函数
 std::string HttpRequest(CString   lpHostName, short sPort, CString lpUrl, CString lpMethod, char * lpPostData, int nPostDataLen)
{
    HINTERNET hInternet = nullptr, hConnect = nullptr, hRequest = nullptr;

    BOOL bRet;

    std::string strResponse;

    hInternet = (HINSTANCE)InternetOpen(CString("User-Agent"), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if (!hInternet)
        goto Ret0;

    hConnect = (HINSTANCE)InternetConnect(hInternet, lpHostName, sPort, NULL, CString("HTTP/1.1"), INTERNET_SERVICE_HTTP, 0, 0);
    if (!hConnect)
        goto Ret0;

    hRequest = (HINSTANCE)HttpOpenRequest(hConnect, lpMethod, lpUrl, CString("HTTP/1.1"), NULL, NULL, INTERNET_FLAG_RELOAD, 0);
    if (!hRequest)
        goto Ret0;

    //bRet = HttpAddRequestHeaders(hRequest,"Content-Type: application/x-www-form-urlencoded",Len(FORMHEADERS),HTTP_ADDREQ_FLAG_REPLACE | HTTP_ADDREQ_FLAG_ADD);
    //if(!bRet)
        //goto Ret0;

    bRet = HttpSendRequest(hRequest, NULL, 0, lpPostData, nPostDataLen);
    while (TRUE)
    {
        char cReadBuffer[4096];
        unsigned long lNumberOfBytesRead;
        bRet = InternetReadFile(hRequest, cReadBuffer, sizeof(cReadBuffer) - 1, &lNumberOfBytesRead);
        if (!bRet || !lNumberOfBytesRead)
            break;
        cReadBuffer[lNumberOfBytesRead] = 0;
        strResponse = strResponse + cReadBuffer;
    }

Ret0:
    if (hRequest)
        InternetCloseHandle(hRequest);
    if (hConnect)
        InternetCloseHandle(hConnect);
    if (hInternet)
        InternetCloseHandle(hInternet);

    return strResponse;
}

调用

//添加一个按钮的点击事件 
void CmQMFCDlg::OnClickedButton1()
{
    //发送左键点击事件给 OnLButtonDown 这个程序自己重写了 
    //SendMessage(WM_LBUTTONDOWN, WM_LBUTTONDOWN, 0x00010002);
    string result;
    //gank.io/api/today 
    //std::string strResponse = HttpRequest(_T("www.wanandroid.com"), 80, _T("article/list/1/json"), _T("GET"), NULL, 0);
    std::string strResponse = HttpRequest(_T("gank.io"), 80, _T("api/xiandu/categories"), _T("GET"), NULL, 0);
#pragma warning(disable:4996)//fopen_s  版本过旧警告
    FILE * fp = fopen("C:\\Users\\Administrator\\Desktop\\result.json", "wb");
    fwrite(strResponse.c_str(), strResponse.length(), 1, fp);
    fclose(fp);
    //将获取到的json写入到文本框上
    GetDlgItem(IDC_EDIT1)->SetWindowText(CString(strResponse.c_str()));
}

#

```
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不断跟新中。。。