C++ 如何在win32中更改窗口的背景图像?
如何在WIN32运行时更改窗口的背景图像C++ 如何在win32中更改窗口的背景图像?,c++,winapi,visual-c++,C++,Winapi,Visual C++,如何在WIN32运行时更改窗口的背景图像 我已经使用CreateWindow()创建了窗口。然后我有一个LoadImage按钮,可以打开一个模型对话框(打开文件对话框)。。。现在我想使用此对话框返回的文件名作为窗口的图像。窗口背景没有原生概念,您必须手动绘制图像,通常在WM_ERASEBKGND消息中。如果您正在使用MFC,您可以查看本文:窗口背景没有原生概念,您必须手动绘制图像,通常在WM_ERASEBKGND消息中。如果您使用的是MFC,您可以查看这篇文章:A可以有背景图像(尽管它仅限于位图
我已经使用CreateWindow()创建了窗口。然后我有一个LoadImage按钮,可以打开一个模型对话框(打开文件对话框)。。。现在我想使用此对话框返回的文件名作为窗口的图像。窗口背景没有原生概念,您必须手动绘制图像,通常在
WM_ERASEBKGND
消息中。如果您正在使用MFC,您可以查看本文:窗口背景没有原生概念,您必须手动绘制图像,通常在WM_ERASEBKGND
消息中。如果您使用的是MFC,您可以查看这篇文章:A可以有背景图像(尽管它仅限于位图)。您可以将子静态控件放置在窗口内(大小为边到边),并将其设置为背景
如果你想要像透明度这样奇特的图像处理,你需要手动操作。A可以有背景图像(尽管它仅限于位图)。您可以将子静态控件放置在窗口内(大小为边到边),并将其设置为背景
如果您想要像透明度这样奇特的图像处理,您需要手动执行此操作。一段CoreyStop在窗口回调中解释的示例代码:
switch (message)
{
case WM_CREATE:
{
HBITMAP hImage = (HBITMAP)LoadImage(NULL, L"guibg.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
HWND hImageView = CreateWindowEx(NULL, L"STATIC", NULL, SS_BITMAP | WS_VISIBLE | WS_CHILD, 0, 00, 500, 600, hWnd, (HMENU)IMAGE_VIEW, GetModuleHandle(NULL), NULL);
SendMessage(hImageView, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hImage);
...
同样要感谢fritzone,他在类似的帖子中回答了这个问题:
注意:请使用paint生成的位图,否则LoadImage可能会返回NULL而不出错,并且图像将不可见。CoreyStop在窗口回调中解释的示例代码:
switch (message)
{
case WM_CREATE:
{
HBITMAP hImage = (HBITMAP)LoadImage(NULL, L"guibg.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
HWND hImageView = CreateWindowEx(NULL, L"STATIC", NULL, SS_BITMAP | WS_VISIBLE | WS_CHILD, 0, 00, 500, 600, hWnd, (HMENU)IMAGE_VIEW, GetModuleHandle(NULL), NULL);
SendMessage(hImageView, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hImage);
...
同样要感谢fritzone,他在类似的帖子中回答了这个问题:
注意:请使用paint生成的位图,否则LoadImage可能会返回NULL而不出错,并且图像将不可见。编译下面的代码 在文本框中输入文件名,然后按“更改背景” 我使用mingw4.7 只能使用.bmp图像,如果要使用其他图像,则必须使用GdiPluse
#include <windows.h>
//variables
HWND hwnd01, label01;
HBITMAP hBitmap01 = NULL;
//functions
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow )
{
MSG msg ;
WNDCLASS wc = {0};
wc.lpszClassName = TEXT( "GUI01" );
wc.hInstance = hInstance ;
wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc.lpfnWndProc = WndProc ;
wc.hCursor = LoadCursor(0, IDC_ARROW);
RegisterClass(&wc);
hwnd01 = CreateWindow( wc.lpszClassName, TEXT("GUI01 Headline"),
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
150, 150, 330, 150, 0, 0, hInstance, 0);
while( GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch(msg)
{
case WM_CREATE:
{
CreateWindow(TEXT("button"), TEXT("Change Background"),
WS_VISIBLE | WS_CHILD ,
20, 50, 140, 25,
hwnd, (HMENU) 1, NULL, NULL);
CreateWindow(TEXT("button"), TEXT("Quit"),
WS_VISIBLE | WS_CHILD ,
190, 50, 80, 25,
hwnd, (HMENU) 2, NULL, NULL);
label01 = CreateWindow(TEXT("Edit"), TEXT("Label"),
WS_VISIBLE | WS_CHILD,
20, 10, 280, 25,
hwnd, (HMENU) 3, NULL, NULL);
break;
}
case WM_COMMAND:
{
if (LOWORD(wParam) == 1) {
TCHAR* string01 = new TCHAR[300];
GetWindowText(label01, string01, 300);
hBitmap01 = (HBITMAP)LoadImage(NULL, string01, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if (hBitmap01==NULL)
MessageBox(NULL, "Error Loading Image.", "ERROR", MB_ICONWARNING | MB_DEFBUTTON2);
else
InvalidateRect(hwnd01, NULL, TRUE);
}
if (LOWORD(wParam) == 2) {
PostQuitMessage(0);
}
break;
}
case WM_PAINT:
{
PAINTSTRUCT ps01;
HDC hdc01;
BITMAP bitmap01;
HDC hdcMem01;
HGDIOBJ oldBitmap01;
hdc01 = BeginPaint(hwnd01, &ps01);
hdcMem01 = CreateCompatibleDC(hdc01);
oldBitmap01 = SelectObject(hdcMem01, hBitmap01);
GetObject(hBitmap01, sizeof(bitmap01), &bitmap01);
BitBlt(hdc01, 0, 0, bitmap01.bmWidth, bitmap01.bmHeight, hdcMem01, 0, 0, SRCCOPY);
SelectObject(hdcMem01, oldBitmap01);
DeleteDC(hdcMem01);
EndPaint(hwnd01, &ps01);
break;
}
case WM_DESTROY:
{
PostQuitMessage(0);
break;
}
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
#包括
//变数
HWND hwnd01,label01;
HBITMAP hBitmap01=NULL;
//功能
LRESULT回调WndProc(HWND、UINT、WPARAM、LPARAM);
int WINAPI WinMain(HINSTANCE HINSTANCE、HINSTANCE HPPreInstance、,
LPSTR lpCmdLine,int nCmdShow)
{
味精;
WNDCLASS wc={0};
wc.lpszClassName=文本(“GUI01”);
wc.hInstance=hInstance;
wc.hbrBackground=GetSysColorBrush(颜色面);
wc.lpfnWndProc=WndProc;
wc.hCursor=加载光标(0,IDC_箭头);
注册类(&wc);
hwnd01=CreateWindow(wc.lpszClassName,文本(“GUI01标题”),
WS|U重叠窗口| WS|U可见,
150、150、330、150、0、0、0);
while(GetMessage(&msg,NULL,0,0)){
翻译信息(&msg);
发送消息(&msg);
}
返回(int)msg.wParam;
}
LRESULT回调WndProc(HWND HWND,UINT msg,WPARAM WPARAM,LPARAM LPARAM)
{
开关(msg)
{
案例WM_创建:
{
CreateWindow(文本(“按钮”)、文本(“更改背景”),
WS|u可见| WS|u儿童,
20, 50, 140, 25,
hwnd,(HMENU)1,空,空);
CreateWindow(文本(“按钮”)、文本(“退出”),
WS|u可见| WS|u儿童,
190, 50, 80, 25,
hwnd,(HMENU)2,空,空);
label01=CreateWindow(文本(“编辑”)、文本(“标签”),
WS|u可见| WS|u儿童,
20, 10, 280, 25,
hwnd,(HMENU)3,空,空);
打破
}
case WM_命令:
{
如果(LOWORD(wParam)==1){
TCHAR*string01=新的TCHAR[300];
GetWindowText(label01、string01、300);
hBitmap01=(HBITMAP)LoadImage(NULL,string01,IMAGE\u位图,0,0,LR\u LOADFROMFILE);
如果(hBitmap01==NULL)
消息框(NULL,“加载图像时出错”,“错误”,MB|U图标警告| MB|U取消按钮2);
其他的
无效(hwnd01,空,真);
}
if(LOWORD(wParam)==2){
PostQuitMessage(0);
}
打破
}
案例WM_油漆:
{
PAINTSTRUCT-ps01;
HDC-hdc01;
位图bitmap01;
HDC-hdcMem01;
hgdobj-oldBitmap01;
hdc01=开始喷漆(hwnd01和ps01);
hdcMem01=CreateCompatibleDC(hdc01);
oldBitmap01=SelectObject(hdcMem01,hBitmap01);
GetObject(hBitmap01、sizeof(bitmap01)和bitmap01);
BitBlt(hdc01,0,0,bitmap01.bmWidth,bitmap01.bmHeight,hdcMem01,0,0,SRCCOPY);
选择对象(hdcMem01,oldBitmap01);
DeleteDC(hdcMem01);
端漆(hwnd01和ps01);
打破
}
案例WM_销毁:
{
PostQuitMessage(0);
打破
}
}
返回DefWindowProc(hwnd、msg、wParam、lParam);
}
编译下面的代码
在文本框中输入文件名,然后按“更改背景”
我使用mingw4.7
只能使用.bmp图像,如果要使用其他图像,则必须使用GdiPluse
#include <windows.h>
//variables
HWND hwnd01, label01;
HBITMAP hBitmap01 = NULL;
//functions
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow )
{
MSG msg ;
WNDCLASS wc = {0};
wc.lpszClassName = TEXT( "GUI01" );
wc.hInstance = hInstance ;
wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc.lpfnWndProc = WndProc ;
wc.hCursor = LoadCursor(0, IDC_ARROW);
RegisterClass(&wc);
hwnd01 = CreateWindow( wc.lpszClassName, TEXT("GUI01 Headline"),
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
150, 150, 330, 150, 0, 0, hInstance, 0);
while( GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch(msg)
{
case WM_CREATE:
{
CreateWindow(TEXT("button"), TEXT("Change Background"),
WS_VISIBLE | WS_CHILD ,
20, 50, 140, 25,
hwnd, (HMENU) 1, NULL, NULL);
CreateWindow(TEXT("button"), TEXT("Quit"),
WS_VISIBLE | WS_CHILD ,
190, 50, 80, 25,
hwnd, (HMENU) 2, NULL, NULL);
label01 = CreateWindow(TEXT("Edit"), TEXT("Label"),
WS_VISIBLE | WS_CHILD,
20, 10, 280, 25,
hwnd, (HMENU) 3, NULL, NULL);
break;
}
case WM_COMMAND:
{
if (LOWORD(wParam) == 1) {
TCHAR* string01 = new TCHAR[300];
GetWindowText(label01, string01, 300);
hBitmap01 = (HBITMAP)LoadImage(NULL, string01, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if (hBitmap01==NULL)
MessageBox(NULL, "Error Loading Image.", "ERROR", MB_ICONWARNING | MB_DEFBUTTON2);
else
InvalidateRect(hwnd01, NULL, TRUE);
}
if (LOWORD(wParam) == 2) {
PostQuitMessage(0);
}
break;
}
case WM_PAINT:
{
PAINTSTRUCT ps01;
HDC hdc01;
BITMAP bitmap01;
HDC hdcMem01;
HGDIOBJ oldBitmap01;
hdc01 = BeginPaint(hwnd01, &ps01);
hdcMem01 = CreateCompatibleDC(hdc01);
oldBitmap01 = SelectObject(hdcMem01, hBitmap01);
GetObject(hBitmap01, sizeof(bitmap01), &bitmap01);
BitBlt(hdc01, 0, 0, bitmap01.bmWidth, bitmap01.bmHeight, hdcMem01, 0, 0, SRCCOPY);
SelectObject(hdcMem01, oldBitmap01);
DeleteDC(hdcMem01);
EndPaint(hwnd01, &ps01);
break;
}
case WM_DESTROY:
{
PostQuitMessage(0);
break;
}
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
#包括
//变数
HWND hwnd01,label01;
HBITMAP hBitmap01=NULL;
//功能
LRESULT回调WndProc(HWND、UINT、WPARAM、LPARAM);
int WINAPI WinMain(HINSTANCE HINSTANCE、HINSTANCE HPPreInstance、,
LPSTR lpCmdLine,int nCmdShow)
{
味精;
WNDCLASS wc={0};
wc.lpszClassName=文本(“GUI01”);
wc.hInstance=hInstance;
wc.hbrBackground=GetSysColorBrush(颜色面);
wc.lpfnWndProc=WndProc;
wc.hCursor=加载光标(0,IDC_箭头);
注册类(&wc);
hwnd01=CreateWindow(wc.lpszClassName,文本(“GUI01标题”),
WS|U重叠窗口| WS|U可见,
150、150、330、150、0、0、0);
while(GetMessage(&msg,NULL,0,0)){
翻译信息(&msg);
发送消息(&msg);
}
返回(int)msg.wParam;
}
LRESULT回调WndProc(HWND HWND,UINT msg,WPARAM WPARAM,LPARAM LPARAM)
{
开关(msg)
{
案例WM_创建:
{
CreateWindow(文本(“按钮”)、文本(“更改背景”),
WS|u可见| WS|u儿童,
20, 50, 140, 25,
hwnd,(HMENU)1,空,空);
创造