幾個常見Win32 API函數

1.獲取客戶區矩形區域

RECT cliRect;
GetClientRect(hWnd, &cliRect);

2.獲取窗口上下文句柄

HDC hdc = GetDC(hWnd);
//....
ReleaseDC(hWnd, hdc);

 

 3.LPWSTR   與 char * 互轉

int32_t WToChar(LPWSTR szWstr, char szCstr[], const int32_t chrLen)
{
    int iLength = WideCharToMultiByte(CP_ACP, 0, szWstr, -1, NULL, 0, NULL, NULL);
    return WideCharToMultiByte(CP_ACP, 0, szWstr, -1, szCstr, iLength, NULL, NULL);
}

int32_t CharToW(const char* szCstr, WCHAR szWstr[], const int32_t wstrLen)
{
    int iLength = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, szCstr, -1, NULL, 0);
    return MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, szCstr, -1, szWstr, iLength);
}

 

 

4.獲取帶顏色的畫刷

COLORREF colorObs = 0x9D9D9D;
HBRUSH hbObs = CreateSolidBrush(colorObs);

//....

DeleteObject(hbObs);

 

5.繪制矩形

Rectangle(hdc ,left,top,right,bottom);

 

6.填充矩形

FillRect(hdc, &rect, hbObs);

 

7.刷新整個窗口

InvalidateRect(hWnd, NULL, TRUE);

 

8.設置窗口標題

SetWindowText(hWnd, szText);

 

9.打開文件對話框

bool OpenFileDialog(HWND hWnd, char szFileName[MAX_PATH])
{
    WCHAR szFile[MAX_PATH] = { 0 };
    OPENFILENAME ofn = { OPENFILENAME_SIZE_VERSION_400 };
    ofn.hwndOwner = hWnd;
    // 過濾器,以\0相隔: 顯示名稱\0過濾器\0顯示名稱\0過濾器\0\0  
    ofn.lpstrFilter = TEXT("txt(*.txt)\0*.txt\0All Files(*.*)\0*.*\0\0");
    ofn.lpstrFile = szFile;
    ofn.nMaxFile = sizeof(szFile);
    ofn.lpstrTitle = TEXT("選擇文件");
    ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;
    TCHAR szCurDir[MAX_PATH];
    GetCurrentDirectory(sizeof(szCurDir), szCurDir);
    ofn.lpstrInitialDir = szCurDir;//設置對話框顯示的初始目錄  
    BOOL bOk = GetOpenFileName(&ofn);
    if (!bOk)
    {
        return false;
    }
    //MessageBox(NULL, ofn.lpstrFile, TEXT("Tips_Yes"), MB_OK);
    memset(szFileName, 0, sizeof(szFileName));
    WToChar(ofn.lpstrFile, szFileName, sizeof(szFileName));
    return true;
}

 

10.保存文件對話框

bool SaveFileDialog(HWND hWnd, char szFileName[MAX_PATH])
{
    WCHAR szFile[MAX_PATH] = { 0 };
    OPENFILENAME ofn = { OPENFILENAME_SIZE_VERSION_400 };
    ofn.hwndOwner = hWnd;
    // 過濾器,以\0相隔: 顯示名稱\0過濾器\0顯示名稱\0過濾器\0\0  
    ofn.lpstrFilter = TEXT("txt(*.txt)\0*.txt\0All Files(*.*)\0*.*\0\0");
    ofn.lpstrFile = szFile;
    ofn.nMaxFile = sizeof(szFile);
    ofn.lpstrTitle = TEXT("選擇文件");
    ofn.Flags = OFN_OVERWRITEPROMPT;        // 覆蓋提示  
    TCHAR szCurDir[MAX_PATH];
    GetCurrentDirectory(sizeof(szCurDir), szCurDir);
    ofn.lpstrInitialDir = szCurDir;//設置對話框顯示的初始目錄  
    BOOL bOk = GetSaveFileName(&ofn);
    if (!bOk)
    {
        return false;
    }
    //MessageBox(NULL, ofn.lpstrFile, TEXT("Tips_Yes"), MB_OK);
    memset(szFileName, 0, sizeof(szFileName));
    WToChar(ofn.lpstrFile, szFileName, sizeof(szFileName));
    return true;
}

 

11.獲取或設置控件文字

GetDlgItemText(hDlg, IDC_EDIT_ROW, szTRow, 64);
SetDlgItemText(hDlg, IDC_EDIT_COL, szTCol);

 

12.獲取光標位置

POINT pt;
GetCursorPos(&pt);

 

13.屏幕坐標與窗口坐標之間的轉化

ScreenToClient(hWnd, &pt);
ClientToScreen(hWnd, &pt);

 

14.設置窗口位置和大小

SetWindowPos(hWnd, NULL, nX, nY, nWidth, nHeight, false);

15. 打開右鍵菜單

 

void UIManager::OnContextMenu(const HWND &hWnd, const RECT &cliRect, const POINT &clickPt)
{
    POINT tmpt = clickPt;
    ScreenToClient(hWnd, &tmpt);
    if (PtInRect(&cliRect, tmpt) == FALSE){ return; }
    HMENU hroot = LoadMenu((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE), MAKEINTRESOURCE(IDR_CONTEXT));
    if (!hroot){ return; }
    HMENU hpop = GetSubMenu(hroot, 0);
    if (!hpop){ return; }
    ClientToScreen(hWnd, &tmpt);
    //顯示快捷菜單  
    TrackPopupMenu(hpop,
        TPM_LEFTALIGN | TPM_TOPALIGN | TPM_RIGHTBUTTON,
        tmpt.x,
        tmpt.y,
        0,
        hWnd,
        NULL);
    // 用完后要銷毀菜單資源  
    DestroyMenu(hroot);
}