我只是在搞混CPP和Windows控制台。我需要更改屏幕缓冲区的特定部分,但它始终会打印我想要的字符串以及一个空的方形框。
是否可以删除此空白框?
int screen_w = 120;
int screen_h = 30;
void init_screen(wchar_t* screen_buffer, int screen_w, int screen_h) {
for (int i = 0; i < screen_h; ++i) {
for (int j = 0; j < screen_w; ++j) {
if (i != 0 && i != 2 && i != screen_h - 1 &&
j != 0 && j != screen_w - 1) {
screen_buffer[i * screen_w + j] = ' ';
} else {
screen_buffer[i * screen_w + j] = '#';
}
}
}
}
int main() {
int screen_s = screen_w * screen_h;
wchar_t *screen_buffer = 0;
screen_buffer = (wchar_t *) calloc(screen_s, sizeof *screen_buffer);
HANDLE c_handle = CreateConsoleScreenBuffer(
GENERIC_WRITE | GENERIC_READ,
0,
0,
CONSOLE_TEXTMODE_BUFFER,
0);
SetConsoleActiveScreenBuffer(c_handle);
DWORD bytes_written = 0;
init_screen(screen_buffer, screen_w, screen_h);
while (1) {
Sleep(1000 / 10);
WriteConsoleOutputCharacterW(c_handle, screen_buffer, screen_s, { 0, 0 }, &bytes_written);
wsprintfW(&screen_buffer[15 * screen_w + 60], L"hello world"); // THIS IS WHAT I DO.
// TRIED OTHER SIMILAR FUNCTIONS.
if (GetAsyncKeyState(VK_SPACE) & 0x8000) break;
}
free(screen_buffer = 0);
return 0;
}
显示的内容:
########################################################################################################################
# #
########################################################################################################################
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# hello world▯ #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
########################################################################################################################```
答案 0 :(得分:3)
问题是您的wsprintfW()
调用(或任何sprintf
函数系列)会将(必需)nul
终止符附加到输出缓冲区段中...并且在某些平台的控制台中,此 可能被呈现为“奇怪”字符。
因此,与其尝试将 formatted 字符串写入缓冲区,不如直接使用直接的内存复制例程。
以下行-代替您的wsprintf(...)
呼叫-将达到目的:
memcpy(&screen_buffer[15 * screen_w + 60], L"hello world", wcslen(L"hello world") * sizeof(wchar_t));
但是您可以使用声明的(本地)变量使代码看起来更漂亮/更简单:
const wchar_t* text = L"hello world";
memcpy(&screen_buffer[15 * screen_w + 60], text, wcslen(text) * sizeof(wchar_t));