我正在嘗試使用 PInvoke 綁定此 C 函數(shù)。bool GuiTextBox(Rectangle bounds, char *text, int textSize, bool editMode);這是 PInvoke 簽名。[DllImport(nativeLibName,CallingConvention = CallingConvention.Cdecl)]public static extern bool GuiTextBox(Rectangle bounds,
string text,
int textSize,
bool freeEdit);當(dāng)我嘗試使用它時(shí)，字符串不會(huì)被修改。我嘗試將它作為 ref 傳遞，但是當(dāng)我嘗試使用它時(shí)它會(huì)因嘗試讀取或?qū)懭胧鼙Ｗo(hù)的內(nèi)存而崩潰。
1 回答
臨摹微笑
TA貢獻(xiàn)1982條經(jīng)驗(yàn) 獲得超2個(gè)贊
我希望它應(yīng)該是這樣的：
// private : do not expose inner details;
// we have to manipulate with StringBuilder
[DllImport(nativeLibName,
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "GuiTextBox",
CharSet = CharSet.Unicode)] //TODO: Provide the right encoding here
private static extern bool CoreGuiTextBox(Rectangle bounds,
StringBuilder text, // We allow editing it
int textSize,
bool freeEdit);
// Here (in the public method) we hide some low level details
// memory allocation, string manipulations etc.
public static bool CoreGuiTextBox(Rectangle bounds,
ref string text,
int textSize,
bool freeEdit) {
if (null == text)
return false; // or throw exception; or assign "" to text
StringBuilder sb = new StringBuilder(text);
// If we allow editing we should allocate enough size (Length) within StringBuilder
if (textSize > sb.Length)
sb.Length = textSize;
bool result = CoreGuiTextBox(bounds, sb, sb.Length, freeEdit);
// Back to string (StringBuilder can have been edited)
// You may want to add some logic here; e.g. trim trailing '\0'
text = sb.ToString();
return result;
}
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